大型风洞PIV试验的关键技术

Discussion on Key Technologies of PIV test in large wind tunnel

摘要:

从粒子产生及投放技术、图像拼接技术、反光处理技术、时序调整技术、设备标定技术五个方面深入探讨了大型风洞PIV试验的关键问题及处理方法。提出了在大型风洞试验中开展粒子投放,应选择经济实用的材料,研制足量可控且可持续供应的粒子发生装置,同时要在适当的位置进行投放；在进行大视场图像拼接时,应选择先分别计算再进行速度场结果进行拼接的方法,并在图像采集前做拼接标定,以获得拼接参数；在反光处理时,应根据实际情况选择最佳的反光处理方法,如选择移动相机的方法,应在图像处理时进行变形修正；在大型风洞中,应掌握快速高效的时序调整及设备标定方法,提高试验效率。

Abstract:

This paper discusses the key problems and processing methods of PIV test in large wind tunnel from five aspects: particle generation and delivery technology, image mosaic technology, reflective processing technology, timing adjustment technology and equipment calibration technology. In order to launch particles in large-scale wind tunnel test, it is necessary to select economic and practical materials, develop sufficient controllable and sustainable supply of particle generation devices, and launch particles at appropriate positions; When stitching large field of view images, we should choose the method of calculating separately and then stitching the velocity field results, and do stitching calibration before image acquisition to obtain stitching parameters; In reflective processing, the best reflective processing method should be selected according to the actual situation. For example, the method of moving camera should be selected, and deformation correction should be carried out in image processing; In large wind tunnel, it is necessary to master fast and efficient timing adjustment and equipment calibration methods to improve test efficiency.