高速流动PIV示踪粒子跟随性分析  

Tracking Characteristics of PIV Tracer Particles in High Speed Flows

作　　者：陈小虎 陈方[1] 刘洪[1] 沙莎[3] 逯雪铃 张庆兵[3] 

机构地区：[1]上海交通大学航空航天学院,上海200240 [2]中国空空导弹研究院,河南洛阳471000 [3]北京电子工程总体研究所,北京100854

出　　处：《气体物理》2017年第4期36-45,共10页Physics of Gases

基　　金：国家973计划项目;国家自然科学基金(11102111;11672183;91641129)

摘　　要：通过理论推导提出了一种评价高速流动PIV示踪粒子随流能力的松弛特性分析模型,在法向Mach数大于1.4时具有良好的适用性.将新模型应用于试验测量,发展了高速流动PIV系统和示踪粒子布撒技术,验证了高速流动PIV的定量化测量能力.针对空间发展的二维超声速气固两相混合层,数值模拟了不同Stokes数和对流Mach数(M_c)下的粒子跟随性以及弥散和迁徙运动,结果表明:相同对流Mach数,粒径越小的示踪粒子跟随性越好,Stokes数在[1,10]范围内的粒子有最大扩散距离.示踪粒子的直径大小决定其在超声速混合层大涡拟序结构中的分布特征,且粒径越小,气体与粒子的掺混越剧烈.相同粒径的粒子,对流Mach数越大跟随性越差.A new tracer particle relaxation modeling was presented to evaluate the PIV particle tracking ability, which improved the applicability of relaxation modeling as normal Mach number more than 1.4. Applying the new modeling to PIV experiment, the PIV system and tracer particle seeding technology were developed, and PIV quantificational measurement ability was demonstrated. The numerical simulation of tracking and dispersion characteristics of tracer particles in 2D spatial development supersonic gas-solid two-phase mixing layer was investigated with different Stokes numbers and convective Mach numbers. The smaller tracer particle diameters show the better tracking characteristics for the same convective Mach number flow. The particles present the largest dispersion distance as the Stokes number between 1 and 10. Particle distribution characteristics in mixing coherent vortex structure are represented by the diameters. With the decrease of the particle scale, the particles mixing with the gas vortex are strengthened. The particle tracking characteristics turn worse as the convective Mach number increases for the same tracking particle diameter.

关 键 词：PIV 超声速混合层 松弛模型 粒子跟随性 Stokes数 对流Mach数 

分 类 号：O359[理学—流体力学]