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Roles and mechanisms of casing treatment on different scales of flow instability in high pressure ratio centrifugal compressors

机译：高压比离心压缩机中套管处理在不同程度的流量不稳定性中的作用和机理

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The development of single-stage high pressure ratio centrifugal compressors for small gas turbine engines is hindered by compressor flow instabilities with various temporal and spatial scales. In this paper, the effect of a self-recirculation casing treatment device for suppressing various scales of flow instability has been discussed. Rig tests of a high pressure ratio centrifugal compressor with and without a casing treatment device are performed, and transient pressure signals are measured at endwalls by fast response pressure transducers. By analyzing measured pressure signals in both time and frequency domain, the casing treatment device is found effective in eliminating rotating instability and stall at the impeller inlet at low speeds, as well as suppressing surge of the compression system at middle and high speeds. The flow recirculation process generated inside the casing treatment device removes the vortical structures at the impeller inlet tip section, therefore eliminating the regional rotating instability and stall. Besides, the casing treatment device turns the pressure rise characteristics of the impeller more negative by enhancing the impeller work input, but turns that of the vaned diffuser more positive by increasing the incidence at the vaned diffuser inlet. Combining both effects, mild surge and the deep surge are suppressed. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：用于小型燃气涡轮发动机的单级高压比离心式压缩机的开发受到具有各种时间和空间尺度的压缩机流量不稳定性的阻碍。在本文中，已经讨论了一种自循环套管处理装置在抑制各种规模的流动不稳定性方面的效果。进行带有和不带有外壳处理装置的高压比离心压缩机的装备测试，并通过快速响应压力传感器在端壁处测量瞬态压力信号。通过在时域和频域两方面分析测得的压力信号，发现套管处理设备可有效消除低速时叶轮入口处的旋转不稳定性和失速，并抑制中速和高速时压缩系统的喘振。壳体处理设备内部产生的气流再循环过程消除了叶轮入口尖端部分的涡旋结构，因此消除了区域旋转不稳定性和失速。此外，壳体处理装置通过增加叶轮功输入而使叶轮的压力上升特性变得更负，而通过增加在叶片扩散器入口处的入射率而使叶片扩散器的压力升高特性变得更正。结合这两种效果，可以抑制轻度波动和深度波动。 （C）2018 Elsevier Masson SAS。版权所有。

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