PDPA技术在圆管射流测量中的应用  

Testing Investigation for RoundJet with PDPA System

作　　者：张维智[1] 张守军[1] 王丹[1] 

机构地区：[1]中国空气动力研究与发展中心

出　　处：《流体力学实验与测量》1999年第2期66-72,共7页Experiments and Measurements in Fluid Mechanics

摘　　要：采用激光相位多普勒技术（ＰＤＰＡ）和传统热线对圆管射流进行试验研究，试验结果表明：ＰＤＰＡ技术具有精度高、动态响应快、不干扰流场等特点；自由剪切湍流的扩展率ｄｙｃ／ｄｘ＝０．０８０１，完全自模拟特性区在ｘ／Ｄ＞８。This paper introduces the experiment results using the hot wire(HW)anemometer and PDPA (Phase Doppler Particle Analyzer) technology about round jet.Meanwhile,it is pointed out that the differences between the experiment results of the non invasion measurement and invasion measurement.The measurement accuracy of initial merging zone and fully merged zones for PDPA system has been obtained. The experiment diffusivity of the fully merged zones dy c/dx is 0.0801.The experiment results have showed the complete similarity of the mean velocity profiles at distance greater than eight primary diameters downstream.The flow visualization obtained the plots of the full flow velocity vectors about the round jet flow with the non invasion PDPA technology.The results of PDPA agree well with the calculation velocity ratios.

关 键 词：激光 相位多普勒 剪切湍流 粒子投放 流动显示 

分 类 号：O357.54[理学—流体力学]