摘要
针对超声速流场速度场难以测量的特点,搭建了一套具有高时空分辨率的快速多帧PIV测量系统,对压比为5的超声速欠膨胀自由射流流场进行了测量,PIV速度场结果分别与国外的实验结果和数值模拟结果进行对比,验证了本PIV系统的良好性能。结合速度场分布图像对超声速自由射流的流场结构进行了分析,并基于速度场分布获得了涡量场分布等信息。实验结果表明,涡量场中存在两条环状涡量分布区,将自由射流的下游流场分割为三块速度、温度等参数沿径向分布规律显著不同的区域。
In consideration of measuring the velocity field of supersonic flow, a multi-frame PIV system with high spatio-temporal resolution is build up and is used to obtain quantitative measurements of supersonic underexpanded free jet at the number of pressure ratio is 5. The results agree well with both foreign experimental results and numerical results, and good performance of the PIV system is verified. The vorticity distribution is obtained by processing the PIV velocity distribution, and the flow field structure of supersonic free jet is analyzed. The experimental results show that there are two annular vortices in the vorticity field, which divide the downstream flow field of supersonic free jet into three regions with different distribution rules along the radial direction.
出处
《机电产品开发与创新》
2018年第1期4-6,15,共4页
Development & Innovation of Machinery & Electrical Products
基金
国家自然科学基金面上项目(11372356)
