含制冷剂气体的两级径向压缩机近喘振工况的数值研究

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Carlo Cravero, Davide Marsano, Vishnu Sishtla, Chaitanya Halbe, William T. Cousins
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引用次数: 0

摘要

现代压缩机的设计目标是高性能和宽工作范围,以减少对环境的影响。为了理解引发不稳定性的流体动力学机制,需要在稳定极限下研究系统。在这项工作中,采用计算流体动力学(CFD)技术,在接近喘振的不同工作点进行非定常计算,模拟了一种用于制冷剂应用的两级背靠背离心压缩机。通过数值性能与实验数据的对比,验证了模型的正确性。通过深入的流体动力学分析,结合对多个压力信号的监测,并进行FFT后处理,确定了两个阶段向喘振极限方向的不同流动现象。在第一阶段,蜗壳的关键作用引起了更强的上游反压。这种效应导致扩散器中高熵(低动量)旋转单元的形成,其中涉及相对于第二扩散器中的流动结构的更高的通道部分。这种现象影响了叶轮上游的流动状况。此外,还分析了进口导叶(IGV)与诱导体之间的相互作用,观察到在第二级,由于中间压气机管道后的流动不均匀性,发生了不可忽略的分离。从压力信号的FFT分析中检测到的峰值开始,对上述所有流动机制进行了检测和讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Investigations of Near Surge Operating Conditions in a Two-Stage Radial Compressor with Refrigerant Gas
Abstract Modern compressor design targets require high performance and a wide operating range in order to reduce the environmental impact. To understand the fluid dynamics mechanisms that trigger instability, studying the system at the stability limit is required. In this work, a two-stage back-to-back centrifugal compressor for refrigerant applications has been simulated with computational fluid dynamics (CFD) techniques using unsteady calculations in different operating points close to surge. These models have been validated by comparing numerical performance with experimental data. An in-depth fluid dynamics analysis combined with the monitoring of several pressure signals, postprocessed with FFT, identified different flow phenomena in the two stages toward the surge limit. The key role of the volute that induces a stronger upstream counterpressure in the first stage has been highlighted. This effect causes the formation of high entropy (low momentum) rotating cells in the diffuser that involve a higher channel portion with respect to the flow structure in the second diffuser. This phenomenon affects the upstream flow conditions at the impeller. In addition, the interaction between the inlet guide vane (IGV) and the inducer has been analyzed, observing that in the second stage, due to the flow nonuniformity after the intermediate compressor pipe, non-negligible separations occur. Starting from the peaks detected in the FFT analysis of the pressure signals, all the above flow mechanisms have been detected and discussed.
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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