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PIV Measurement of Shock Waves in a Transonic Centrifugal Compressor

跨音速离心压缩机中冲击波的 PIV 测量

基本信息

批准号：
11650178
负责人：
HAYAMI Hiroshi
金额：
$ 2.3万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650178/
关键词：
Fluid Machinery Centrifugal Compressor Flow Measurement PIV Shock Wave Pressure Measurement Surging Stall

项目摘要

In a single-stage high-pressure-ratio centrifugal compressor, the velocity relative to the impeller and to the diffuser usually exceeds the velocity of sound. That is, generation of shock wave is unavoidable. The objectives of the present study are to measure the flow including the shock wave in the impeller inlet or between diffuser cascade vanes using a double-pulse Particle Image Velocimetry (PIV) and to clarify the relationship between the intensity of shock wave and the flow rate. A conditional sampling technique is applied to get a relative position between a rotating impeller and stationary vanes, and then an instantaneous structure of shock wave is discussed. Furthermore, a temporal change in shock wave structure will be discussed with stall or surging.(1) PIV diagnostics using a small wind-tunnel, simulating an impeller blade passage or a diffuser intervanes, was constructed. The minimum time interval of 1 μs and the maximum velocity of 55 m/s were established.(2) A laser light sheet projector was designed for sensing of submicron particles.(3) PIV measurement at the impeller inlet was succeeded, where the maximum absolute velocity was about 92 m/s. There is not enough data to discuss details yet, but a velocity vector map indicated the existence of a shock wave.(4) Many know-hows are accumulated on a laser-sheet lighting, a particle seeding, a laser pulse interval, a technique to determine the location of impeller blades and so on.(5) A detailed measurement of pressure field between cascade diffuser vanes was carried out. The system to create the structure of unsteady pressure field including shock waves due to rotor-stator interaction was constructed.

在单级高压比离心压缩机中，相对于叶轮和扩压器的速度通常超过声速。也就是说，冲击波的产生是不可避免的。本研究的目的是使用双脉冲粒子图像测速技术（PIV）测量叶轮进口或扩压器叶栅叶片之间的流动，包括激波，并澄清激波的强度与流量之间的关系。应用条件采样技术，得到了旋转叶轮与静叶的相对位置，进而讨论了激波的瞬时结构。此外，还将讨论失速或喘振时激波结构的时间变化. (1)PIV诊断使用一个小的风洞，模拟叶轮叶片通道或扩压器intervanes，构建。确定了最小时间间隔为1 μs，最大速度为55 m/s。(2)设计了一种用于亚微米粒子传感的激光片光投影仪。(3)在叶轮进口处进行了PIV测量，最大绝对速度约为92 m/s。目前还没有足够的数据来讨论细节，但速度矢量图表明冲击波的存在。(4)在激光片照明、粒子播种、激光脉冲间隔、确定叶轮叶片位置的技术等方面积累了许多技术诀窍。(5)对叶栅扩压器叶片间的压力场进行了详细的测量。建立了一套用于生成包含激波的非定常压力场结构的系统。