激光-超声旋涡测量方法研究  

A Laser-Ultrasonic Method for Vortex Measurements

作　　者：张彬乾[1] 宋宙模[1] 李建英[1] 谢拴勤[1] 张宏鹏[1] 张渤[1] 

机构地区：[1]西北工业大学

出　　处：《西北工业大学学报》1998年第4期584-588,共5页Journal of Northwestern Polytechnical University

基　　金：国防"八五";"九五"气动攻关项目

摘　　要：激光－超声方法是通过测量由流动引起的超声脉冲信号在两束或更多来激光之间传递的时间差实现旋涡场测量的。该方法的一个显著特点是无需在流场中注入粒子，可以对流场中任何一点（包括涡核处）进行准确测量。适合研究旋涡的破裂和稳定性问题，获得有关旋涡场的速度、涡量及环量分布。对函道风扇流场的测量结果表明，该方法可以准确获得流场的速度分布，给出流场的旋转结构。Our laser - ultrasonic method is better than existing laser methods for measuring flows.So we use our laser - ultrasonic method to measure the vortex field of the flow. The method involves the measurement of flow - induced travel time differences of ultrasonic pulses,which propagate between two or among several laser beams. One advantage is that there is no need of injecting particle into flow field. The second advantage is that any point of the flow field, including especially the vortex core, can be measured.Our method is capable of investigating vortex breakdown and the stability of vortices;we use it to determine velocity distribution, vorticity distribution, and circulation distribution of vortices.The measurement system of our laser - ultrasonie method is shown schematically in Fig. 7.Test results for the flow field of a specific ducted fan, given in Fig. 8, confirm preliminarily that our method can obtain the velocity distribution and swirling structure of its flow field.

关 键 词：测量 速度分布 激光-超声法 旋涡流动 飞行器 

分 类 号：V211.71[航空宇航科学与技术—航空宇航推进理论与工程] O357.1[理学—流体力学]