【摘要】 采用粒子图像测速(Particle Image Velocimetry,PIV)技术,以乙二醇烟雾作为示踪粒子,实验测量了平面激波作用下SF6气柱-空气界面Richtmyer-Meshkov不稳定性演化图像和二维速度场。测量结果揭示了不稳定性流场的典型特征和细微结构,与高速摄影和数值模拟结果符合,说明建立的PIV技术适合用于诊断气体界面演化过程,为气体界面不稳定性实验研究提供了一种先进、精细的诊断技术。更多还原

【Abstract】 An experimental investigation on gas interfacial instability was carried out with particle image velocimetry(PIV) technique.The evolution images and two dimensional velocity field of a shock-accelerated heavy gas cylinder in air were experimentally measured utilizing glycol fog droplets as tracking particle.The results exhibited the typical characteristics and fine structure of instability flow field,which were consistent with the numerical and experimental results published previously.Therefore,the PIV technique is feasible to measure the gaseous interface evolution process,and also is a advanced and accurate diagnostic technology for gaseous interfacial instability experiment.更多还原