【摘要】 本文结合气腔模型和节流阀模型建立了一种离心压缩机与管网系统的关联模型,该关联模型实现了压缩机从稳态到喘振的数值模拟。通过关联模型对离心压缩机内部流场进行了三维非定常数值研究,对叶轮流道和扩压器内的流动结构进行了绘制和分析。研究了压缩机出口压力及出口质量流量随时间的波动变化,分析了喘振工况下压缩机-管网系统的特性变化,讨论了出口阀门系数、背压等参数对喘振的影响。更多还原

【Abstract】 In this paper, a correlation model between centrifugal compressor and its piping system is built based on plenum chamber model and throttle valve model. This model could be used to conduct numerical analysis of compressor systems from steady to surge operating points. Three dimensional unsteady numerical simulations were performed to predict the performance of a centrifugal compressor. The flow structures in blade passage and diffuser were plotted and analyzed. The fluctuations of pressure and mass flow rate over time at the outlet of diffuser are obtained at surge condition. The characteristic changes of compressor-pipe network under the surge condition were carried out,and the effects of model characteristics including valve coefficient and backpressure on surge were analyzed.更多还原