• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Design of improved compact decoupler based on adjustable capacitor for EASTICRF antenna

    2022-02-15 11:08:58GenCHEN陳根YuzhouMAO毛玉周ShuaiYUAN袁帥YanpingZHAO趙燕平HuaYANG楊樺XinjunZHANG張新軍ChengmingQIN秦成明YanCHENG程艷andYongshengWANG王永勝
    Plasma Science and Technology 2022年1期
    關(guān)鍵詞:新軍永勝

    Gen CHEN (陳根), Yuzhou MAO (毛玉周), Shuai YUAN (袁帥),Yanping ZHAO (趙燕平), Hua YANG (楊樺), Xinjun ZHANG (張新軍),Chengming QIN(秦成明),Yan CHENG(程艷)and Yongsheng WANG(王永勝)

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China

    Abstract The Ion Cyclotron Radio Frequency (ICRF) heating antenna on EAST adopts a decoupling device to constrain power coupling among the radiation straps, which was discovered shortcomings such as long size, poor contact, and etc.In order to improve these weak points, a new type decoupler with terminal-loaded tunable capacitor is designed to replace the previous design.Besides the capability of the tunable admittance parameters of decoupler, the withstand voltage of the capacitor is the most significant consideration for working under high power.Therefore, the theoretical analysis carefully elaborates the capacitor withstand voltage, and the detailed analytical equations and criteria for design are given.After the comparative analysis of theoretical calculation and 3D simulation results, the decoupler design scheme is finalized.The capacitor-loaded decoupler has been successfully adopted for ICRF antenna at port N on EAST,and achieved the optimization of adjacent port isolation from ?22 to ?58 dB at 37 MHz without plasma to restrict mutual coupling.The new design of the decoupler has greatly improved its compactness and automatic adjustment performance, and could be good solution for the decoupling network of ICRF antennas.

    Keywords: decoupler, ICRF, adjustable capacitor, EAST

    1.Introduction

    The Ion Cyclotron Radio Frequency (ICRF) heating antenna adopts the design of multi-radiation straps, which results in a strong power coupling between the straps [1–7].To restrain such power coupling,variable decouplers have been developed in the world tokamak machines[8–13],and a decoupler based on the T-shape shorted stub was used on EAST [14–17].However, during the experiment, it was discovered that the short-circuit type with piston had shortcomings such as long size, difficult to adjust electrical length, poor contact of the short-circuit finger which leads to easy burning out etc.Therefore, it is planned to adopt a terminal-loaded tunable capacitor solution to shorten the length of the stub and facilitate adjustment,and the design of none short-circuit contact finger can avoid the problem of poor contact and burnout.

    The design of a decoupler with terminal-loaded tunable capacitors should meet the requirements of mutual coupling suppression on EAST antennas, which works under the pressurized atmosphere of the transmission line.By changing the capacitance value, the imaginary part of non-diagonal term of Y parameter of the decoupler is supposed to achieve∣YT12/T21∣ ≤5 × 10?4S [16].In addition, the compactness and feasibility of the structure, the withstand voltage and the tunable range of the capacitor and other factors also need to be considered during the process of system design.

    Three significant aspects are elaborated: T-shape stub with tunable capacitor design, simulation analysis and physical test.Section 2 introduces the theoretical derivation of the admittance matrix of the decoupling device, the relationship among the capacitor voltage and the capacitance value, and so on.Section 3 builds a simulation model based on the design parameters and discusses the simulation results.Section 4 shows the test results of the developed system without plasma.Finally, there is a conclusion of the whole design and tests.

    2.Design analysis of T-shape stub loaded with tunable capacitor

    Besides the tunable admittance parameters of decoupler, the withstand voltage of the capacitor is the most significant consideration for decoupler to work under high power.Therefore, based on the microwave engineering theory, the calculation model of capacitor loaded decoupler is constructed, and the capacitor working voltage and other performance parameters are deduced theoretically,which will be the foundation of the parameter’s selection of decoupler.

    2.1.Y matrix of decoupler

    Based on the original design [16], only the change of the introduced part of capacitive loading needs to be considered.Two-port network design with T-shape structure is applied on the decoupler.One of the ports is loaded with a terminal short-circuit tunable vacuum capacitor, as shown in figure 1(a).The T-shape stub loaded with tunable capacitor circuit used in decoupler can be equivalent to a two-port network cascaded by three parts,as shown in figure 1(b).The cascaded three parts are transmission lineL,1L2and T-shape stub respectively, where the ABCD matrix of transmission lineL1andL2can be expressed as:

    where,βis phase constant,lis the length of transmission lineL1andL2.Because of symmetrical design,L1=L2=l.Y0is the characteristic admittance of transmission line.

    The ABCD matrix of part 2, i.e.T-shape stub, is:whereYdcan be expressed as [18]:

    Among them,ZdandYdare the impedance and the admittance of the T-shape stub,θis the equivalent phase of the capacitor,ωis the operating angular frequency,Cis the capacitance of the capacitor.

    According to microwave transmission theory, the ABCD matrix of decoupler can be expressed as:A=A1×A2×A1,and according to the conversion relationship of Y matrix and ABCD matrix, the Y matrix of decoupler can be derived as:

    where

    Therefore, the diagonal admittance of decoupler is determined by the equivalent phase of the terminal-loaded capacitor, which is the foundation for the decoupler to perform the mutual coupling suppression.

    2.2.Operation voltage Vc of capacitor

    When the capacitor is loaded at the short-circuit end of the T-shape stub, the withstand voltage and the tunable capacitance value need to be considered for high-power operation and antenna decoupling.The voltage at both ends of decoupler is:Vm=[V1V2],then, the current can be expressed as:[I1I2] =YT×Vm.According to the relationship between ABCD matrix and voltage-current,it can be deduced thatVdis as follow:

    T-shape stub with terminal loaded capacitor can be expressed as figure 2,dis the fixed length of transmission line before loaded capacitor,Z0is characteristic impedance of transmission line.The voltage of loaded capacitor can be sustained by the voltage propagation equations of a terminated transmission line [18], which is:

    Figure 1.(a) Equivalent model of decoupler, (b) equivalent circuit of decoupler.

    2.3.Parameter selection of tunable capacitor

    Based on equations (4) and (7), the known parameters and conditions can be brought in to design the withstand voltage and capacitance value of the tunable capacitor.According to the design requirements and test conditions of ICRF antenna,the parameters already known are as follows:

    (1) Operating frequency =f37 MHz;

    (2) Design requirements according to experimental statistics [16]:∣ Im(YT21) ∣ ≤5 × 10?4S;

    (3) Length selection of T-shape stub:L1=L2=

    (4) Port voltage at the hard-fed connection between T-shape stub and ICRF antenna:V1=V2=30 kV;

    (5) According to tunable capacitor selection manual [19],the operating voltage amplitude of the capacitor:∣ ∣≤Vc30 kV, and the range ofCis: 60 pF ≤C≤1000 pF,so as to ensure the compactness of branchd.

    Put condition (3) into equation (4) to derive:

    Figure 2.Diagram of the T-shape stub.

    Figure 3.Relationships between voltageVc of capacitor and capacitance ofC.

    According to equation (7), it can be deduced that:

    To satisfy design requirement (2), the range of tan (βd?θ)can be derived from equation (8) that:

    Taking three significant digits after the decimal point,atan (0 .025) ≈0.025, atan ( ? 0 .025) ≈?0.025, and tan function takesπas the period, then solve equation (10) to obtain:? 0 .025 +n×π≤βd?θ≤0.025 +n×π, n is an integer.

    According to known condition(5),the range of capacitor C is: 60 pF ≤ C ≤1000 pF,the equivalent electric phase can be derived: 0.0858 ≤θ≤0.9618.In order to makedlength of T-shape stub as compact as possible,the value ofnis set to be 0, so:

    Figure 4.AdmittanceYT12 and voltageVc with different capacitance C of the capacitor.

    According to equation (9), the voltage of the tunable capacitor can be calculated under different values ofd, as shown in figure 3.It is shown that the absolute value of capacitor voltageVcdecreases asCincreases, i.e.when the capacitance value of the tunable capacitor is larger, the voltages withstand condition of the capacitor itself will be significantly improved.

    However, when the capacitance valueCof the tunable capacitor is greater, in order to achieve the corresponding parallel admittanceYT21required,the length ofdwill become shorter, and the structural implementation will become more difficult.TakingYT21into account, the working parametersd=450 mm, 220 pF ≤C≤260 pF are determined.At this time, the tunable range of T-shape stub is∣ Im(YT21) ∣< 5 × 10?4S,and the capacitance voltageVcis 19–22 kV, as shown in figure 4.

    3.Cross-check with 3D simulations

    According to these parameters, the capacitor CKTB1000/35/25 produced by Kunshan Guoli Electronic Technology Co.,which can achieve the tunable capacitance of ?60 1000 pF with the maximum voltage of 30 kV, is selected [19].Simulation models are built based on this capacitor, as shown in figure 5.Through the optimization of the lengthdand capacitorC,the result achieved shows that when =d450 mm, and 163 pF ≤C≤183 pF, it can realize the design require ments of capacitor voltageVc≤30 kV,and Im(YT21) can be tune d within∣ Im (YT21) ∣ ≤5 × 10?4S,as shown in fgiure 6.The∣ Im(YT21) ∣< 5 × 10? 4S.capacitor voltage is 22.6 kV ≤Vc≤23.7 kV with the

    In order to make ( )YImT21meet the tunable requirement of(∣ Im (YT21) ∣ ≤5 × 10?4S) ,there are differences between the analytical calculation results shown in figure 4 and the 3D model simulation results shown in figure 6.The results of analytical calculation showed that =d450 mm and the tunable range of capacitanceCwas 220 pF ≤C≤260 pF with the operating voltage of 19 kV ≤Vc≤22 kV.However, the results of 3D simulation showed that =d450 mm and the tunable range of capacitanceCwas 163 ≤ ≤CpF 183 pF with the operating voltage of 22.6 kV ≤Vc≤23.7 kV.The reason for the difference is that there is parasitic capacitance and inductance inside and outside the capacitor.In figure 5,the lumped capacitor is set between the capacitor and the outer conductor and there is also an electric field distribution,which induces the additional parasitic capacitance and inductance.In addition, it can also be found that the influences of other parasitic factors, such as parasitic capacitance and inductance introduced by the discontinuity of capacitor connector, have caused the appeal deviation.As a result, the actual withstand voltage of the capacitance maybe exceed the calculated value, which should be noted in experiments.In practice, after the capacitor is adjusted to the decoupling working point,its capacitance can be measured again to check its withstand voltage.

    Figure 5.(a) 3D modeling of T-shape stub loaded capacitor, (b)electric field distribution of loaded capacitor in the T-shape stub.

    4.Test of decoupler

    Considering the achievability of the structure of d-length,theoretical calculation parameters adopted finally are:L1andL2take 1/4 wavelength of 2143 mm,dis 450 mm, and the model of capacitor is CKTB1000/35/250.The test adapters are selected at the ports of T-shape stub connector, as shown in figure 7(a).From the perspective of structural size, the previous design of the sliding stub is ~5 m long,as shown in figure 7(b), and tune of electrical length is achieved by mechanical sliding of short-circuit terminal.When the size is too long, it is quite difficult to guarantee the concentricity effectively.So, there is an obvious risk of damage to the short-circuit contact fingers with high-power operation, as found in previous experiments.Besides, the application of vacuum capacitors effectively reduces the size of the decoupler, which has obvious advantages when building the decoupling network for an ICRF multi-strap antenna.

    Figure 6.Working diagram of capacitor voltageVc, admittanceYT12 and capacitorC at the operating frequency of37 MHz.

    Compared with T-shape stub,the difference of decoupler isL1/2?450 mm in transmission line length at two ports,so the decoupler admittance can be obtained by measuring T-shape stub and transforming it by microwave networks analysis, as shown in figure 8.The test results of parallel admittance ( )YImT21of decoupler meet the required tunable range of(∣ Im (YT21) ∣ ≤5 × 10?4S) .In the working region of capacitor, there is a certain linear relationship between capacitance regulation and admittance change, which is in line with the theoretical analysis in section 2.In addition,the admittance of the decoupler has a very wide tune range,which means that it can be used as a general design solution for various ICRF antennas.However, from the theoretical analysis, it is known that the choice of the working capacitance directly determines the working voltage and high-power stability of the capacitor, which needs to be considered in actual usage and has been described in the above theoretical analysis and analytical solution.

    In EAST 2021 experiments, the decoupler with this new design is adopted for two straps ICRF antenna at port N.The scattering parameterS21of the two ports without plasma tested by a vector network analyzer is optimized from –22 to–58 dB at the working frequency of 37 MHz, as shown in figure 9.Due to the influence of plasma discharge parameters,the adjustable capacitance will be fine-tuned between shots for compensation.Usually, the fine-tuning range is very fine.For coaxial adjustable capacitors, it does not exceed the adjustment range of one circumference.Then a limit signal can be used to overcome the difficulty of coaxial adjustable capacitor in capacitance calibration.Based on above reasons,this design of capacitor-loaded decoupler satisfies the requirements of compactness and remote adjustability for ICRF decoupling network on EAST.

    Figure 7.(a) Capacitor-loaded T-shape stub, (b) T-shape stub with mechanical sliding of short-circuit terminal.

    Figure 8.Test data of /YT T12 21 of T-shape stub and decoupler.

    Figure 9.Scattering parameter S21 before and after decoupling at 37 MHz.

    5.Conclusions

    During the design of capacitor-loaded decoupler, those factors,such as the adjustable range of parallel admittance, the compactness and feasibility of the structure, and the voltage and adjustable range of the capacitor, have been taken into considerations.The theoretical analysis carefully elaborates the capacitor withstand voltage,which is the most significant aspect for high power operation of decoupler,and the detailed analytical equations and criteria for design are given.The test results show that the imaginary part ofYT21covers∣ Im (YT21) ∣ ≤5 × 10?4S.The capacitor-loaded decoupler has been successfully adopted for ICRF antenna at port N on EAST,and achieved the optimization from ?22 to ?58 dB at 37 MHz without plasma.The new design of the decoupler has greatly improved its compactness and automatic tune performance,and could be good solution for the decoupling network of ICRF antennas.

    Acknowledgments

    This work is supported by National Natural Science Foundation of China (No.11775258).

    猜你喜歡
    新軍永勝
    韓永勝
    大江南北(2022年11期)2022-11-08 12:04:18
    唱一首祖國(guó)的贊歌
    一種兩級(jí)雙吸管道輸油泵
    宇通T7團(tuán)隊(duì)再添新軍
    汽車觀察(2018年12期)2018-12-26 01:05:44
    Examining spatiotemporal distribution and CPUE-environment relationships for the jumbo fl ying squidDosidicus gigasoffshore Peru based on spatial autoregressive model*
    謝永勝
    寶藏(2018年6期)2018-07-10 02:26:38
    Morphological beak differences of loliginid squid, Uroteuthis chinensis and Uroteuthis edulis, in the northern South China Sea*
    新軍
    永勝油茶的深情厚意
    活著
    欧美日韩国产亚洲二区| 午夜爱爱视频在线播放| 欧美一区二区国产精品久久精品| 国产一区二区在线观看日韩| 久久久久久九九精品二区国产| 美女被艹到高潮喷水动态| 直男gayav资源| 久99久视频精品免费| 69av精品久久久久久| 有码 亚洲区| eeuss影院久久| 午夜福利高清视频| 一级黄片播放器| 久久精品国产亚洲网站| 精品无人区乱码1区二区| 免费看av在线观看网站| 秋霞在线观看毛片| videossex国产| 国产亚洲最大av| 91aial.com中文字幕在线观看| 亚洲精品久久久久久婷婷小说 | 一区二区三区高清视频在线| 欧美三级亚洲精品| 久久精品人妻少妇| 中文欧美无线码| 国产一区亚洲一区在线观看| 久久国内精品自在自线图片| 免费观看精品视频网站| 91午夜精品亚洲一区二区三区| 又粗又硬又长又爽又黄的视频| 男人的好看免费观看在线视频| 99久久人妻综合| 国产毛片a区久久久久| 深夜a级毛片| 美女xxoo啪啪120秒动态图| 日韩 亚洲 欧美在线| 十八禁国产超污无遮挡网站| 国内精品美女久久久久久| 亚洲综合色惰| 日本av手机在线免费观看| 久久久久网色| 成人综合一区亚洲| 久久久亚洲精品成人影院| 亚洲av成人av| 亚洲国产精品成人久久小说| 成人一区二区视频在线观看| 久久精品人妻少妇| 校园人妻丝袜中文字幕| 欧美另类亚洲清纯唯美| 欧美区成人在线视频| 国产精品av视频在线免费观看| 两个人视频免费观看高清| 极品教师在线视频| 国产伦理片在线播放av一区| 亚洲自拍偷在线| 美女xxoo啪啪120秒动态图| 久久精品夜色国产| 91狼人影院| 亚洲精品,欧美精品| 综合色av麻豆| 男人狂女人下面高潮的视频| 天天一区二区日本电影三级| 最新中文字幕久久久久| 美女内射精品一级片tv| 国产高清三级在线| 我的老师免费观看完整版| 一本—道久久a久久精品蜜桃钙片 精品乱码久久久久久99久播 | 成人毛片a级毛片在线播放| 国产成人精品婷婷| 在线免费观看不下载黄p国产| 麻豆一二三区av精品| 男人舔奶头视频| 亚洲最大成人av| 热99re8久久精品国产| 赤兔流量卡办理| 午夜日本视频在线| 国产黄片视频在线免费观看| 干丝袜人妻中文字幕| 久久精品国产亚洲av涩爱| 亚洲国产精品sss在线观看| 一夜夜www| 女的被弄到高潮叫床怎么办| 成年版毛片免费区| 国产成人精品婷婷| 日本黄色片子视频| 日本熟妇午夜| 久久久久久久久大av| 男人的好看免费观看在线视频| 黄色欧美视频在线观看| 2022亚洲国产成人精品| 91久久精品国产一区二区成人| 欧美极品一区二区三区四区| av在线蜜桃| 少妇的逼好多水| 最近2019中文字幕mv第一页| 亚洲最大成人中文| 亚洲成人中文字幕在线播放| av国产久精品久网站免费入址| 久久人妻av系列| 夜夜看夜夜爽夜夜摸| 99在线人妻在线中文字幕| 性色avwww在线观看| 一级爰片在线观看| 日本五十路高清| 综合色丁香网| 精品人妻一区二区三区麻豆| 国产极品精品免费视频能看的| 变态另类丝袜制服| 女人被狂操c到高潮| 少妇高潮的动态图| 亚洲av福利一区| 国产真实乱freesex| 国产成人午夜福利电影在线观看| 26uuu在线亚洲综合色| 欧美xxxx黑人xx丫x性爽| 十八禁国产超污无遮挡网站| 国产极品天堂在线| 亚洲高清免费不卡视频| 99久久精品一区二区三区| 久久欧美精品欧美久久欧美| 日日摸夜夜添夜夜爱| 99久久人妻综合| 国产免费福利视频在线观看| 国产亚洲最大av| 久久草成人影院| 久久久久久久久久久免费av| 国产成人精品婷婷| 国产精品蜜桃在线观看| 老司机影院毛片| 亚洲熟妇中文字幕五十中出| 桃色一区二区三区在线观看| 成人亚洲欧美一区二区av| 亚洲av成人av| 国产v大片淫在线免费观看| h日本视频在线播放| 高清日韩中文字幕在线| 在线免费十八禁| kizo精华| 亚洲美女视频黄频| 中文乱码字字幕精品一区二区三区 | 精品一区二区三区视频在线| av专区在线播放| 国产极品天堂在线| av国产久精品久网站免费入址| 啦啦啦观看免费观看视频高清| 波多野结衣高清无吗| 日韩成人av中文字幕在线观看| 亚洲国产精品久久男人天堂| 国产精品综合久久久久久久免费| 天美传媒精品一区二区| 老女人水多毛片| 亚洲精品自拍成人| 国产黄片视频在线免费观看| 啦啦啦韩国在线观看视频| 国产午夜精品久久久久久一区二区三区| av卡一久久| 成人美女网站在线观看视频| 日本五十路高清| 日韩成人av中文字幕在线观看| 精品人妻一区二区三区麻豆| 午夜福利在线在线| 久久久久九九精品影院| 国产在线男女| 婷婷六月久久综合丁香| 欧美xxxx性猛交bbbb| 色5月婷婷丁香| 亚洲精品成人久久久久久| 日韩高清综合在线| 91狼人影院| 国产一区二区在线观看日韩| 一区二区三区乱码不卡18| a级一级毛片免费在线观看| 欧美日韩精品成人综合77777| 禁无遮挡网站| 国产精品99久久久久久久久| 亚洲欧洲国产日韩| 人妻少妇偷人精品九色| 国产成人freesex在线| 婷婷六月久久综合丁香| 桃色一区二区三区在线观看| 亚洲中文字幕一区二区三区有码在线看| 亚洲最大成人av| 99久久人妻综合| 中文字幕av成人在线电影| 91在线精品国自产拍蜜月| 最近最新中文字幕大全电影3| 亚洲精品日韩在线中文字幕| 久久午夜福利片| av专区在线播放| eeuss影院久久| 99在线视频只有这里精品首页| av在线亚洲专区| 国产私拍福利视频在线观看| 婷婷色av中文字幕| 国产女主播在线喷水免费视频网站 | av卡一久久| 日韩一区二区视频免费看| 免费观看a级毛片全部| 禁无遮挡网站| 黄色一级大片看看| 亚洲最大成人av| 精品久久久久久久久久久久久| 日本免费一区二区三区高清不卡| 国产免费视频播放在线视频 | 我的老师免费观看完整版| 搡老妇女老女人老熟妇| 99热精品在线国产| 久久精品夜夜夜夜夜久久蜜豆| 亚洲欧美日韩高清专用| 免费av不卡在线播放| 成年女人永久免费观看视频| 乱码一卡2卡4卡精品| 男人舔奶头视频| 国模一区二区三区四区视频| 国产探花极品一区二区| 九色成人免费人妻av| 亚洲av电影不卡..在线观看| 一区二区三区高清视频在线| 色播亚洲综合网| 一级毛片aaaaaa免费看小| 日韩精品有码人妻一区| 秋霞在线观看毛片| 国产高潮美女av| 色播亚洲综合网| 赤兔流量卡办理| 美女国产视频在线观看| 国产一级毛片在线| 永久免费av网站大全| 日韩av在线大香蕉| 国产伦理片在线播放av一区| 久久久久久国产a免费观看| 亚洲精品乱码久久久v下载方式| 日韩av在线免费看完整版不卡| 国产精品久久久久久av不卡| 中文字幕av在线有码专区| 婷婷色综合大香蕉| 国产精品一区www在线观看| 久久鲁丝午夜福利片| 亚洲美女视频黄频| 免费看av在线观看网站| 久久欧美精品欧美久久欧美| 中文乱码字字幕精品一区二区三区 | av天堂中文字幕网| 校园人妻丝袜中文字幕| 免费观看精品视频网站| 日韩大片免费观看网站 | 成人毛片a级毛片在线播放| 男女视频在线观看网站免费| 国产午夜精品论理片| 97超视频在线观看视频| 亚洲图色成人| 美女大奶头视频| 国产人妻一区二区三区在| 欧美最新免费一区二区三区| 嘟嘟电影网在线观看| av在线蜜桃| 性插视频无遮挡在线免费观看| 亚洲丝袜综合中文字幕| 99久久中文字幕三级久久日本| 啦啦啦啦在线视频资源| 日本黄色视频三级网站网址| 欧美成人a在线观看| 欧美高清成人免费视频www| 99久久精品热视频| 蜜桃久久精品国产亚洲av| 久久99精品国语久久久| 熟女人妻精品中文字幕| 全区人妻精品视频| 国产精品久久视频播放| 在线播放无遮挡| 亚洲av福利一区| 国产91av在线免费观看| 五月伊人婷婷丁香| 婷婷色av中文字幕| 欧美日本亚洲视频在线播放| 久久精品国产亚洲网站| 午夜日本视频在线| 欧美xxxx性猛交bbbb| av.在线天堂| 国产精品女同一区二区软件| 国产午夜精品一二区理论片| 亚洲欧洲日产国产| 精品久久久噜噜| 亚洲av成人精品一二三区| 国产69精品久久久久777片| 边亲边吃奶的免费视频| 久久国内精品自在自线图片| 国语自产精品视频在线第100页| 我要看日韩黄色一级片| 麻豆一二三区av精品| 国产成年人精品一区二区| 韩国av在线不卡| 国产白丝娇喘喷水9色精品| 欧美又色又爽又黄视频| 成人一区二区视频在线观看| 日本免费在线观看一区| 听说在线观看完整版免费高清| 麻豆av噜噜一区二区三区| 国产精品1区2区在线观看.| 3wmmmm亚洲av在线观看| 国模一区二区三区四区视频| 久久精品久久久久久久性| 国产免费男女视频| 看非洲黑人一级黄片| 免费看美女性在线毛片视频| 成人二区视频| 国产高清不卡午夜福利| 欧美精品国产亚洲| 青春草国产在线视频| 色综合色国产| 一边亲一边摸免费视频| 国产69精品久久久久777片| 色网站视频免费| 床上黄色一级片| av女优亚洲男人天堂| 成人高潮视频无遮挡免费网站| 国产一区亚洲一区在线观看| 青春草国产在线视频| 免费av不卡在线播放| 国国产精品蜜臀av免费| 久久久久久久国产电影| 午夜福利网站1000一区二区三区| 欧美一区二区亚洲| 尤物成人国产欧美一区二区三区| 男的添女的下面高潮视频| 一个人免费在线观看电影| 亚洲人成网站高清观看| 国产成人91sexporn| 内地一区二区视频在线| 日产精品乱码卡一卡2卡三| 水蜜桃什么品种好| 日韩精品青青久久久久久| 亚洲国产精品成人久久小说| 久久久久久九九精品二区国产| 日本欧美国产在线视频| 精品国产一区二区三区久久久樱花 | 亚洲av熟女| 波多野结衣巨乳人妻| 久久久久久伊人网av| 九九爱精品视频在线观看| 亚洲精品自拍成人| 99在线视频只有这里精品首页| 午夜福利在线观看免费完整高清在| 欧美成人一区二区免费高清观看| 国产精品99久久久久久久久| 日本免费a在线| 国产成人精品一,二区| 婷婷色综合大香蕉| 人妻系列 视频| 又粗又爽又猛毛片免费看| 久久久国产成人免费| 亚洲第一区二区三区不卡| 春色校园在线视频观看| 国产午夜福利久久久久久| 一级毛片我不卡| 欧美区成人在线视频| 欧美成人一区二区免费高清观看| 全区人妻精品视频| 99在线视频只有这里精品首页| 亚洲第一区二区三区不卡| 美女内射精品一级片tv| 国产熟女欧美一区二区| 禁无遮挡网站| 中文天堂在线官网| 国产麻豆成人av免费视频| 日韩人妻高清精品专区| 久久久久性生活片| 婷婷色麻豆天堂久久 | 久久这里只有精品中国| 亚洲久久久久久中文字幕| 亚洲自拍偷在线| 国产精品美女特级片免费视频播放器| 中文字幕av成人在线电影| 狂野欧美白嫩少妇大欣赏| 亚洲精品自拍成人| 欧美3d第一页| 欧美日韩精品成人综合77777| 老司机福利观看| 久久久久精品久久久久真实原创| 国产久久久一区二区三区| 久久99热这里只有精品18| 亚洲图色成人| 爱豆传媒免费全集在线观看| 成人一区二区视频在线观看| 国产精品爽爽va在线观看网站| 亚洲欧美成人精品一区二区| 国产亚洲最大av| 亚洲成av人片在线播放无| 深爱激情五月婷婷| 国产午夜精品论理片| 观看美女的网站| 久久精品国产亚洲av涩爱| 两个人视频免费观看高清| 欧美激情国产日韩精品一区| 亚洲av熟女| 亚洲av二区三区四区| 免费搜索国产男女视频| 国产免费男女视频| 一二三四中文在线观看免费高清| av福利片在线观看| 男人和女人高潮做爰伦理| 精品一区二区三区人妻视频| 一个人观看的视频www高清免费观看| 少妇的逼水好多| 亚洲av福利一区| 少妇熟女欧美另类| .国产精品久久| 观看美女的网站| 午夜视频国产福利| 亚州av有码| 精品久久久久久久久久久久久| 村上凉子中文字幕在线| 51国产日韩欧美| 精品熟女少妇av免费看| 免费观看性生交大片5| 成人午夜精彩视频在线观看| 国产一区亚洲一区在线观看| 成年av动漫网址| 亚洲国产精品sss在线观看| 免费黄色在线免费观看| 身体一侧抽搐| 少妇猛男粗大的猛烈进出视频 | 最近的中文字幕免费完整| 九九在线视频观看精品| 91在线精品国自产拍蜜月| 97超碰精品成人国产| 国产男人的电影天堂91| 亚洲国产精品久久男人天堂| 深夜a级毛片| 欧美xxxx性猛交bbbb| 最近中文字幕2019免费版| 一个人免费在线观看电影| 啦啦啦韩国在线观看视频| 美女国产视频在线观看| 欧美成人午夜免费资源| 久久国产乱子免费精品| 日韩 亚洲 欧美在线| 精品一区二区三区人妻视频| 性插视频无遮挡在线免费观看| 国产伦在线观看视频一区| 亚洲av成人av| 国产又黄又爽又无遮挡在线| 免费播放大片免费观看视频在线观看 | 日韩一区二区三区影片| 国产免费一级a男人的天堂| 亚洲高清免费不卡视频| 亚洲国产精品合色在线| 69人妻影院| 搞女人的毛片| 精品久久久久久久久av| 真实男女啪啪啪动态图| www日本黄色视频网| 青春草国产在线视频| 91久久精品电影网| 国产精品熟女久久久久浪| 人人妻人人澡人人爽人人夜夜 | 亚洲av福利一区| 国产精品永久免费网站| 久久亚洲精品不卡| 18禁动态无遮挡网站| 婷婷色综合大香蕉| 成人二区视频| 一个人看的www免费观看视频| 久久久精品94久久精品| 国产又黄又爽又无遮挡在线| 久久婷婷人人爽人人干人人爱| 午夜福利成人在线免费观看| 汤姆久久久久久久影院中文字幕 | 色播亚洲综合网| 特级一级黄色大片| 91久久精品国产一区二区三区| 成人美女网站在线观看视频| www日本黄色视频网| 亚洲四区av| 在线观看66精品国产| 69av精品久久久久久| 特级一级黄色大片| 欧美性感艳星| 国产成人午夜福利电影在线观看| 国产黄a三级三级三级人| 国产在视频线在精品| 热99在线观看视频| 内地一区二区视频在线| 最新中文字幕久久久久| 午夜福利成人在线免费观看| 久久这里只有精品中国| 99热这里只有精品一区| 日韩制服骚丝袜av| 久久精品国产鲁丝片午夜精品| 亚洲精品自拍成人| 国产成人aa在线观看| av.在线天堂| 69av精品久久久久久| 精品酒店卫生间| 在线观看美女被高潮喷水网站| 国产午夜精品一二区理论片| 欧美一区二区国产精品久久精品| 成人欧美大片| 国产精品三级大全| 啦啦啦韩国在线观看视频| 久久久久久国产a免费观看| 欧美潮喷喷水| 国产一区二区亚洲精品在线观看| 看片在线看免费视频| 床上黄色一级片| 国产伦精品一区二区三区四那| 一边亲一边摸免费视频| 啦啦啦韩国在线观看视频| 国产国拍精品亚洲av在线观看| 亚洲在线自拍视频| 亚洲精品乱久久久久久| 99热这里只有是精品50| 国产高清视频在线观看网站| 亚洲三级黄色毛片| 亚洲内射少妇av| 天堂av国产一区二区熟女人妻| a级毛片免费高清观看在线播放| 国产午夜精品一二区理论片| 最近视频中文字幕2019在线8| 亚洲av中文字字幕乱码综合| 九九久久精品国产亚洲av麻豆| 韩国高清视频一区二区三区| 国产精品国产三级专区第一集| 午夜爱爱视频在线播放| 日韩欧美 国产精品| 久久久久久久午夜电影| 黄色欧美视频在线观看| 亚洲国产欧美在线一区| 18禁在线无遮挡免费观看视频| 特级一级黄色大片| 一级二级三级毛片免费看| 久久久欧美国产精品| 床上黄色一级片| 少妇的逼水好多| 观看美女的网站| 精品酒店卫生间| 午夜福利视频1000在线观看| 在线观看av片永久免费下载| 精品无人区乱码1区二区| 只有这里有精品99| 亚洲精品456在线播放app| 久久精品久久久久久噜噜老黄 | 亚洲av.av天堂| 高清在线视频一区二区三区 | 成人性生交大片免费视频hd| 亚洲av中文av极速乱| 青春草国产在线视频| 97人妻精品一区二区三区麻豆| 内地一区二区视频在线| 高清日韩中文字幕在线| 国产精品麻豆人妻色哟哟久久 | 国产高清有码在线观看视频| 女人久久www免费人成看片 | 网址你懂的国产日韩在线| 国模一区二区三区四区视频| 亚洲中文字幕日韩| 成人性生交大片免费视频hd| 亚洲欧美精品专区久久| 久久草成人影院| 亚洲欧美成人综合另类久久久 | 亚洲自偷自拍三级| 国产精品电影一区二区三区| 久久久精品欧美日韩精品| 两性午夜刺激爽爽歪歪视频在线观看| 毛片一级片免费看久久久久| 寂寞人妻少妇视频99o| 亚洲欧美中文字幕日韩二区| 午夜日本视频在线| 一级av片app| 国内揄拍国产精品人妻在线| 国产综合懂色| 久久久久久久午夜电影| 不卡视频在线观看欧美| 最后的刺客免费高清国语| 边亲边吃奶的免费视频| 人妻系列 视频| 免费播放大片免费观看视频在线观看 | 色尼玛亚洲综合影院| 国产成人精品婷婷| 国产成人一区二区在线| 天天躁日日操中文字幕| 国产一级毛片七仙女欲春2| 非洲黑人性xxxx精品又粗又长| 亚洲精品日韩av片在线观看| 尤物成人国产欧美一区二区三区| 亚洲av成人av| 日韩在线高清观看一区二区三区| 亚洲欧美日韩卡通动漫| 高清午夜精品一区二区三区| 国产麻豆成人av免费视频| 精华霜和精华液先用哪个| 老女人水多毛片| 综合色av麻豆| 色综合色国产| 一本一本综合久久| 中文欧美无线码| 亚洲国产精品国产精品| 国产精品三级大全| 岛国毛片在线播放| 99在线视频只有这里精品首页| 日本五十路高清| 99热这里只有精品一区| 欧美精品国产亚洲| 国产伦在线观看视频一区| 久久午夜福利片| 国产免费一级a男人的天堂| 成年免费大片在线观看| 亚洲av.av天堂| 麻豆一二三区av精品| 丝袜美腿在线中文| 精品熟女少妇av免费看| 国产视频内射| 美女国产视频在线观看| 少妇的逼水好多| 男女视频在线观看网站免费|