Experimental investigation of instability inducement and mechanism of centrifugal compressors with vaned diffuser
Experimental investigation of instability inducement and mechanism of centrifugal compressors with vaned diffuser
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DOI：
10.1016/j.applthermaleng.2018.01.071
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发表时间：
2018-03
影响因子：
6.4
通讯作者：
Zhenzhong Sun;Xinqian Zheng;T. Kawakubo
中科院分区：
文献类型：
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作者：
Zhenzhong Sun;Xinqian Zheng;T. Kawakubo
本文对带叶片扩压器的离心压缩机的流动不稳定性进行了实验研究，详细分析了全工况范围内的不稳定性诱因和机理。本文采用稳态和动态传感器测量了压气机的稳态性能和瞬态过程。实验结果表明，压气机在不同的工况下会出现不同的流动不稳定模式。在低转速下，随着流量的减小，压气机先后经历了稳态、失速和深度喘振，叶轮进口处的波动扰动是流动不稳定的诱因。在中等转速下，随着流量的减小，压气机先后经历了稳定状态、轻度喘振和深度喘振，扩压器进口的尖峰状不稳定扰动是流动不稳定的诱因。在高转速下，压气机仍会出现稳定状态、轻度喘振和深度喘振，而流动不稳定性主要是由整个压缩系统的特性引起的。本文的研究成果对加深对离心压气机失稳机理的认识和提高离心压气机的稳定性具有重要的意义。
The paper is proposed to experimentally investigate the flow instability of centrifugal compressors with vaned diffuser, and the instability inducement and mechanism at full operating range are presented and analyzed in detail. In this paper, the steady performance and transient evolution process of the compressor are measured by steady and dynamic sensors. Experimental results show that the compressor experiences diverse flow instability patterns at different operating conditions. At low rotating speeds, the compressor undergoes stable state, stall and deep surge successively with mass flow rate decreases and the inducement of the flow instability is the wave-like instability disturbance at the impeller inlet. At middle rotating speeds, the compressor experiences stable state, mild surge and deep surge successively with mass flow rate reduces, and the inducement of the flow instability is the spike-shaped instability disturbance at the diffuser inlet. At high rotating speeds, the compressor still experiences stable state, mild surge and deep surge, whereas the flow instability is dominantly induced by the characteristic of the entire compression system. The research results of this paper promote understandings of the instability mechanism and improvements of the stability of centrifugal compressors.