流体机械

2005, (11) 8-12+87

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多级离心压缩机级间弯道与回流器内流动的数值研究
Numerical Investigation for Aerodynamic Performance of the Crossover and Deswirl Cascade inside a Multistage Centrifugal Compressor

王企鲲;陈康民;戴韧;
WANG Qi-kun,CHEN Kang-min,DAI Ren(University of Shanghai for Science and Technology,Shanghai 200093,China)

摘要(Abstract):

对某型多级离心压缩机的气动性能进行了CFD数值研究,计算方法基于Jameson格式,湍流模型选择Baldwin-Lomax模型。对弯道与回流器等多级压缩机级间的静止部件内的气动特点进行研究,旨在揭示气流经弯道与回流器后气动参数的变化特征。结果表明,不同位置的弯道对流动的影响是截然不同的。由于这些静止部件对流体的扰动,使次级动叶的进口来流工况点偏离设计值,易于造成对整机气动性能的下降。因此多级压缩机的动叶设计应对来流的不均匀性加以充分考虑。
The flow field inside a multistage centrifugal compressor is numerically simulated.Importance is attached on the aerodynamic performance for the crossover and deswirl cascade of the compressor,aiming to disclose the flow distortion induced by those stationary components of the compressor.The numerical approach is based on Jameson central scheme for Reynold's time-Averaged N-S equations.The Reynold's stress is enclosed by Baldwin-Lomax turbulence model.Results indicate: crossovers in different positions may have completely different influence on the flow distortion.The flow distortion induced by the upstream crossover and deswirl cascade may deviate the flow from the design operating condition of the downstream rotating impeller so as to decrease the total aerodynamic performance for the whole machine.The design for rotating impeller of multistage centrifugal compressor should fully take into account the upstream flow distortion.

关键词(KeyWords): 多级离心压缩机;回流叶栅;弯道;气动性能
multistage centrifugal compressor;deswirl cascade;crossover;aerodynamic performance

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基金项目(Foundation): 上海理工大学校青年基金项目(03XQN009)

作者(Author): 王企鲲;陈康民;戴韧;
WANG Qi-kun,CHEN Kang-min,DAI Ren(University of Shanghai for Science and Technology,Shanghai 200093,China)

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