CAJ | 학술논문

在水平激波管中采用PIV方法研究了反射激波作用下SF6重气柱界面的发展演化。采用射流方法形成SF6无膜气柱界面，并以乙二醇作为示踪粒子。利用连续激光片光源结合高速摄影相机对流场进行显示，得到了反射激波作用下SF6气柱界面的发展过程。结果表明，入射激波的冲击会在界面上产生反向旋转的涡环结构，而反射激波的作用会在界面上产生与初始涡环旋转方向相反的次级涡环结构。此外，对反射激波作用后的流场图像进行PIV后处理，获得了流场连续的速度场和涡量场。获得的环量与已有的理论模型进行比较，取得了较好的一致性，也验证了本文实验方法的可行性。
재수평격파관중채용PIV방법연구료반사격파작용하SF6중기주계면적발전연화。채용사류방법형성SF6무막기주계면，병이을이순작위시종입자。이용련속격광편광원결합고속섭영상궤대류장진행현시，득도료반사격파작용하SF6기주계면적발전과정。결과표명，입사격파적충격회재계면상산생반향선전적와배결구，이반사격파적작용회재계면상산생여초시와배선전방향상반적차급와배결구。차외，대반사격파작용후적류장도상진행PIV후처리，획득료류장련속적속도장화와량장。획득적배량여이유적이론모형진행비교，취득료교호적일치성，야험증료본문실험방법적가행성。
Evolution of a membrane-less heavy (SF6 )gas cylinder under reshock condition is experimentally investigated in a horizontal shock tube with particle image velocimetry (PIV ) method.As a fundamental interface configuration,gas cylinder evolution impinged by a single shock wave is extensively investigated while the related research under reshock condition is sel-dom performed.Illuminated by a continuous laser sheet,the interface morphology after the inci-dent shock and reshock impact is characterized by glycol droplets and captured by a high-speed camera.The generation and development of counter-rotating vortex pair after incident shock im-pact is observed and secondary vortex rings,which have opposite rotating directions with the o-riginal vortex rings,are generated after the reshock passage because of the opposite pressure gra-dient induced by reshock compared with the incident shock.Because the velocity of the flow field after reshock is very small,the PIV measurement based on the Matpiv procedure is employed to capture the flow field after reshock.The continuous velocity and vorticity fields are obtained with the help of the continuous light source and high speed camera.Compared with the PIV algorithm based on the double-exposure technique,continuous velocity field can be obtained in a single test run based on the high-speed technique in this experiment.The circulation derived from PIV measurements is compared with the existed analytical model and a good agreement is achieved, which validates the feasibility of the experimental method.