回流道几何参数对高流量系数离心式压缩机性能的影响

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-01-01 DOI:10.47176/jafm.17.3.2211

K. Zhao, Y. Liu, Y. Zhang, Y. Sun, X. Liu, H. Shi

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引用次数: 0

摘要

多级离心压缩机前级的回流道对当前级和后续级的空气动力性能有重大影响。然而，由于回流道结构相对复杂，几何参数较多，文献中没有通用的设计指南。本研究采用数值方法研究了回流道不同几何参数对高流量系数离心压缩机性能的影响。采用多目标遗传算法对回流道进行优化。然后采用敏感性分析方法研究了不同几何参数对性能的影响。计算结果表明，回流道出口处的残余涡流强度受回流道叶片入口和出口几何角度的影响。级出口处的流动均匀性主要受叶片出口几何角度和叶片数量的影响。压缩机级的整体性能主要受叶片入口几何角度和盖板横向倾角的影响。由优化后的第一级及其后续级组成的两级压缩机的计算结果显示，第一级的出口流场比原来的第一级更加均匀。此外，在设计运行条件下，整个设备的多能效和压力比分别提高了 1.07% 和 4.07%。第二级的多向效率和压力比分别提高了 2.34% 和 3.51%。叶轮水头系数增加了 7.33%。理论分析表明，对于高流量系数离心式压缩机，降低一级回流道出口流场的残余涡流强度可以显著改善下一级的非设计性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Effect of the Return-channel Geometric Parameters on the Performance of a Centrifugal Compressor with a High-flow Coefficient

The return-channel of a preceding stage in a multi-stage centrifugal compressor has a significant effect on the aerodynamic performance of the current and subsequent stages. However, due to the relatively complex nature of the return-channel configuration with many geometric parameters, no general design guidance is available in the literature. In this study, numerical methods are used to study the effects of different geometric parameters of a return-channel on the performance of a high-flow-coefficient centrifugal compressor. A multi-objective genetic algorithm is applied to optimize the return-channel. The effects of different geometric parameters on the performance are then studied using a sensitivity analysis method. Calculation results show that the residual vortex intensity at the outlet of the return-channel is affected by the geometric angles of the inlet and outlet of the return-channel blades. The flow uniformity at the stage outlet is primarily affected by the geometric angle of the blade outlet and the number of blades. The overall performance of the compressor stage is primarily affected by the geometric angle of the blade inlet and the lateral inclination angle of the cover plate. Calculation results for a two-stage compressor consisting of the optimized first stage and its following stage show that the outlet flow field of the first stage is more uniform than the original first stage. Additionally, at the design operating condition, the polytropic efficiency and pressure ratio of the entire unit increase by 1.07% and 4.07%, respectively. The polytropic efficiency and pressure ratio for the second stage increase by 2.34% and 3.51%, respectively. The impeller head coefficient increases by 7.33%. The theoretical analysis shows that for high-flow-coefficient centrifugal compressors, reducing the residual vortex intensity of the outlet flow field of the return-channel in a stage can significantly improve the off-design performance of the following stage.

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .