高速PIV布撒技术的改进研究

Research on Improving Technique of PIV Seeding in Hyper/supersonic Flow

基于上海交通大学高超创新实验室现有技术,为发展高速PIV技术而改进开发了高速PIV粒子布撒系统。针对原有系统经常无法有效布撒粒子的缺陷,从系统中的管道、高压气体、喷嘴等几个方向下手进行改造,设计了新的高速PIV粒子布撒系统。对管道进行了软管化设计,高压气体采用干燥的氮气,喷嘴则设计成能在罐体中产生旋流的结构。对于这些改造进行了分析和实验测试,证明了这些改造能加强布撒粒子的效果。最后提出了这套系统可以继续改进的一些方向。

Based on the developed technique of Hypersonic Innovation Technique Laboratory of SJTU, the new PIV seeding system in hyper/supersonic flow is developed and improved.The new PIV seeding system is redesigned by im-proving the conduit,high pressure gas source and nozzle to overcome the instability of effective seeding of the old sys-tem. Flexibility of conduit,high press dry nitrogen and turbulence nozzle are used to reconstruct the system. The recon-struction was analyzed and experimentally tested, which shows that seeding effect is improved. At last, more directions to improve the system are offered.