摘要
采用二维激光多普勒测速仪,对管内活塞下游的分离区流场进行了速度和湍流度测量。获得了轴向和切向上的时均速度及湍流度分布,对于本文雷诺数为3.46×10~6的情况,回流区长度为活塞直径的1.16倍。
Turbulent water flow past a piston in an axisymmetric pipe is measured with a 2-D LDV system. The diameter ratio of the piston to the pipe is 0 .9. Axial mean velocities, axial turbulence intensities, tangential mean velocities, tangential turbulence intensities and the reattach-ment length are obtained for a Reynolds number of 3.46 ×106. The peak value of axial turbulence intensities is in the mixing layer springing off the step edge. The results show that the ratio of the reattachment length to the diameter of the piston is 1. 16.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
1992年第3期369-372,共4页
Chinese Journal of Hydrodynamics
关键词
活塞
湍流
分离流场
轴对称管
LDV measurement, piston, turbulent flow.
