简易粒子图像测速(PIV)技术开发与优化技巧

粒子图像测速(PIV)技术是一种瞬态流动平面二维速度场测试技术,在细部流场实测领域得到重视,但是成熟的PIV产品价格高昂。鉴于此,介绍了一种简易的PIV装置,主要由高速摄像机、激光发射器、柱面透镜和示踪粒子构成,以较低成本即可基本实现商业用PIV产品的功能。为了验证简易PIV性能,设计了PIV简易装置,采用Fluent软件模拟,并结合PIV技术对比分析了简易PIV装置的优缺点,同时对影响结果的粒径大小和粒子跟随性进行了优化。结果表明,简易PIV装置适宜选用玉米粉作为示踪粒子,并需要根据示踪粒子跟随性所能达到的最大进口水流速度选择高速摄像机的帧率,最终能够较好地实现流场实测,进而达到对PIV技术进行开发和优化的目的,其分析结果将为后续研究者提供参考。

Development and Optimization Skills of Simple Particle Image Velocimetry Technology

As a measurement technique of instantaneous 2-D velocity flow field, particle image velocimetry ( PIV) has received much attention in detailed flow field measurement , but mature product of PIV is still expensive .In view of this, we introduce a simple device which consists of high-speed digital camera, laser transmitter, cylindrical lens and tracer particle .The fuctions of business PIV product can be achieved with low cost .To verify the simple PIV performance in this paper , we designed a simple device and analyzed the advantages and disadvantages of this simple device by software Fluent .Furthermore , we optimized the particle size and the tracking performance of parti-cle.Results show that corn flour particle is suitable as the tracer particle of this simple device .Moreover, we should choose the frame rate of high-speed digital camera according to the maximum inlet water velocity which the tracking performance of tracer particle can reach .During this process , we can get a better flow field measurement , and de-velope and optimize the PIV technique .The analysis result offers important reference for further study .