小迷宫密封间隙对离心制冷压缩机性能的影响

为探讨小迷宫密封间隙设计条件下离心制冷压缩机性能变化规律,以离心制冷压缩机为研究对象,通过CFD方法对压缩机叶轮和迷宫密封内的流动进行模拟.研究结果表明:迷宫密封内的流体压力近似呈阶梯状降低;在叶轮入口流量相同时,随密封间隙增大,泄漏量和泄漏损失系数在小流量工况下增大的幅度较大;在同一密封间隙下,随着压缩机叶轮入口流量...

Influence of Small Labyrinth Seal Clearance on Performance of Centrifugal Refrigeration Compressors

In order to investigate the performance change law of centrifugal refrigeration compressor under the design condition of small labyrinth seal clearance,a centrifugal refrigeration compressor was taken as the research object,and the flow in compressor impeller and labyrinth seal was simulated by CFD method.The results show that the gas pressure in the labyrinth seal decreases approximately in a ladder shape.When the inlet flow rate of impellers is the same,with the increase of seal clearance,the leakage rate and leakage loss coefficient increase greatly under the condition of small flow rate.Under the same seal clearance,as the inlet flow rate decreases,the leakage and the leakage loss coefficient increase.After considering the sealing,the total pressure ratio and isentropic efficiency of compressor are reduced,and the larger the seal clearance,the more the reduction.Especially under the condition of small flow,the total pressure ratio and isentropic efficiency decrease more obviously.The total pressure ratio is reduced by 8.02%at most,the isentropic efficiency is reduced by 4.6%at most.