Surging and Stall in a High-Pressure-Ratio Centrifugal Compressor

高压比离心压缩机中的喘振和失速

• 批准号: 09650194
• 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: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650194/
• 关键词: Fluid Machinery; Centrifugal Compressor; Diffuser; Circular Cascade Diffuser; Pressure Measurement; PIV; Surging; Stall; 液体機械; 流れの可視化

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, In the present study, variations of pressure are measured in detail using several pressure sensors with high-frequency response mounted on the side wall between circular-cascade vanes where shock waves appear. To propose the primary data for designing of a low-solidity circular cascade diffuser, the relationship between a diffuser stall and a surging, and the structure and unsteadiness of shock waves are discussed. For measurement of the flow between cascade vanes or the impeller inlet, a new PIV system is discussed for its applicability.(1) The frequency-time analysis using a wavelet transform for pressure signals is effective sufficiently to under- stand the incipience time of stall as well as the time change in frequency till the falling in stall. Furthermore, the time- varying … More power spectra or the time-varying rms rules are also effective for the stall analysis.(2) Before the entry to stall, so called a rotating stall was observed at the inducer and the development of stall cell are shown by the history of rms value of pressure fluctuation every one-blade-pitch or by the analysis of blade- passing-frequency component of wavelet transform.(3) Two pressure signals, mounted on the next inter-vanes of cascade diffuser with each other were independent in space as well as in time even at near surge condition. At the beginning of stall, on the other hand, a high spatiotem- poral correlation in pressure fluctuation was observed at the front vaneless zone.(4) A double-pulse YAG-laser PIV system was applied to the flow induced by a rotating disk in a casing and the problems such as accuracy and so on were discussed. It was verified that the present PIV system with the DOP particles, 0.8 mm in diameters, is applicable for the measurement of flow between diffuser cascade vanes and/or at the impeller inlet. Less

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，激波的产生是不可避免的，在本研究中，压力的变化进行了详细的测量，使用几个压力传感器与高频响应安装在侧壁上的圆形叶栅叶片之间的激波出现。为了给低稠度圆叶栅扩压器的设计提供基本数据，本文讨论了扩压器失速与喘振的关系以及激波的结构和非定常性。针对叶栅或叶轮进口流场的测量，讨论了一种新的PIV系统的适用性。(1)利用小波变换对压力信号进行频时分析，可以有效地了解失速的起始时刻以及频率随时间的变化直至失速。此外，时变 ...更多信息 功率谱或时变RMS规则对于失速分析也是有效的。(2)在进入失速之前，诱导轮处出现了所谓的旋转失速，失速区的发展可以通过每一个叶片节距的压力脉动均方根值的历史或通过小波变换的叶片通过频率分量的分析来显示。(3)即使在近喘振状态下，安装在扩压器相邻叶片间的两个压力信号在时间和空间上也是独立的。另一方面，在失速开始时，在前部无叶区观察到压力脉动的高度时空相关性。(4)采用YAG激光双脉冲PIV系统对旋转圆盘在机匣中的流动进行了研究，并对测量精度等问题进行了讨论。结果表明，采用直径为0.8mm的DOP粒子的PIV系统，可用于扩压器叶栅间和叶轮进口的流动测量。少

项目成果

Hayami, H.: "Improvement of the Flow Range of a Transonic Centrifugal Compressor" Proceedings of US-Japan Seminar: Abnormal Flow Phe-nomena in Turbomachines. 1-5 (1998)

Hayami, H.：“跨音速离心压缩机流量范围的改进”美日研讨会论文集：涡轮机中的异常流量现象。

Hayami, H.: "Improvement of the Flow Range of a Transonic Centrifugal Compressor" Proceedings of US-Japan Semi-nar : Abnormal Flow Phenom-ena in Turbomachines. 1-5 (1998)

Hayami, H.：“跨音速离心压缩机流量范围的改进”美日研讨会论文集：涡轮机中的异常流量现象。

Hayami, H., Fukuuchi, S.: "Pressure Fluctuation in Precess to Stall in a Transonic Centrifugal Compressor" Proceedings of The 3rd ASME/JSME Fluids Engineering Conference. 1-6 (1999)

Hayami, H., Fukuuchi, S.：“跨音速离心压缩机失速过程中的压力波动”第三届 ASME/JSME 流体工程会议论文集。

Hayami, H.: "Flow Measurement in Fluid Machinery and Unsteady Flow Measurement" Proceedings of the 75th JSME Spring Annual Meeting. 98-1. 142-143 (1998)

Hayami, H.：“流体机械中的流量测量和非定常流量测量”第 75 届 JSME 春季年会论文集。

Hayami, H.: "Flow Measurement in a Rotating Impeller Passage Using PIV" Proceedings of Third International Conference on Pumps and Fans. 13-19 (1998)

Hayami, H.：“使用 PIV 测量旋转叶轮通道中的流量”第三届国际泵和风机会议论文集。