Roles of the centrifugal stage in the aerodynamic instability of a multistage combined compressor

IF 3.3 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-07-23 DOI:10.1016/j.expthermflusci.2025.111571

Jiaan Li , Baotong Wang , Xinqian Zheng

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引用次数: 0

Abstract

Aerodynamic instability could deteriorate the performance and structural integrity of a compression system. It has been an important issue in both the engineering and academic fields. Fewer studies have focused on the instability mechanism and behavior of combined compressors consisting of both axial and centrifugal-type stages, which have distinct pressurization capability and instability mechanism from each other. This paper concentrates on the influence of the centrifugal stage in a combined compressor on the overall aerodynamic stability. First, an experiment is carried out to investigate its instability characteristics. Then, a multi-actuator dynamic model is established to further analyze the influence of the centrifugal stage on the combined compressor instability from two aspects, the stage matching and the B parameter. To decouple these two factors, B parameters are increased above the critical value, eliminating its effect on the surge boundary only to investigate the influence of stage matching. Results show that when a stage performance curve with pressure ratio against mass flow rate has a negative slope near the matching point, the centrifugal stage has a stabilizing effect on the overall stability. In contrast, this stage has a detrimental influence when matched on the performance curve with a positive slope. For B parameter effects, a large value of B parameter generally narrows the stable operating range. Therefore, the influence of the centrifugal stage is determined by the balance of the above two aspects. Generally, for a combined compressor in a real industrial application, the change of B parameter by the centrifugal stage has more obvious effects on the overall stability than the stage matching because the centrifugal stage generally has a larger pressurization capability, resulting in a larger value of B parameter. Therefore, both stage matching and B parameter effect should be carefully considered for the stability design of a combined compressor consisting of stages with clear pressurization capability differences, compared with the individual axial or centrifugal compressor including the stages with similar pressurization capability.

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离心级在多级组合式压气机气动失稳中的作用

气动不稳定性会降低压缩系统的性能和结构完整性。它一直是工程和学术领域的一个重要问题。轴向级和离心式级组合压气机的失稳机理和失稳行为研究较少，两者的增压能力和失稳机理各不相同。本文主要研究组合式压气机离心级对整体气动稳定性的影响。首先，对其失稳特性进行了实验研究。然后，建立多作动器动力学模型，从级匹配和B参数两个方面进一步分析离心级对组合式压缩机不稳定性的影响。为了解耦这两个因素，将B参数增加到临界值以上，消除其对浪涌边界的影响，仅研究级匹配的影响。结果表明，当压力比与质量流量的级性能曲线在匹配点附近呈负斜率时，离心级对整体稳定性具有稳定作用。相反，当该阶段与正斜率的性能曲线匹配时，则会产生不利影响。对于B参数的影响，B参数的较大值通常会缩小稳定的工作范围。因此，离心级的影响是由以上两个方面的平衡决定的。通常，对于实际工业应用中的组合式压缩机，由于离心级一般具有更大的增压能力，因此离心级对B参数的改变对整体稳定性的影响比级匹配更明显，从而导致B参数值更大。因此，对于增压能力差别明显的级组成的组合式压缩机，与增压能力相近的单轴式或离心式压缩机相比，在稳定性设计时应慎重考虑级匹配和B参数效应。

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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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.