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本文以某天然气管线用四级离心压缩机为研究对象,通过数值分析压缩机在整机模型、逐级叠加模型和单独模型下的流场和气动性能,研究多级离心压缩机的级间气动影响规律及作用机制。结果表明,在设计工况下,逐级叠加模型的预测精度具有一定的可信度,而在非设计工况下,级间气动影响显著,逐级叠加模型得到的整机总压比低于整机模型;相对于单独模型,整机模型的第二级进口相对马赫数和气流角沿叶高方向分布更为不均,在近喘工况尤为明显;级间影响会破坏通流区流动稳定性,在多级离心压缩机设计过程中应充分考虑级间影响。研究工作对深入了解级间气动影响并完善多级离心压缩机气动性能预测模型具有参考价值。
In this paper, a four-stage centrifugal compressor for natural gas pipeline is taken as the research object. By numerical analysis of flow field and aerodynamic performance of compressor in machine model, stepwise superposition model and single model, the inter-stage aerodynamic performance of multistage centrifugal compressor Influence law and mechanism. The results show that under the condition of design, the prediction accuracy of the stepwise superposition model has a certain degree of credibility. Under the non-designed condition, the inter-stage aerodynamic effect is significant. The total pressure ratio of the complete machine obtained by the stepwise superposition model is lower than Compared with the single model, the second-order relative Mach number and air-flow angle of the whole model are more unevenly distributed in the leaf-height direction, especially in the near-asthma regime; the interstage influence will destroy the flow in the through-flow region Stability, multi-stage centrifugal compressor design process should take full account of interstage effects. The research work has a reference value for understanding the aerodynamic influence between stages and improving the aerodynamic performance prediction model of multistage centrifugal compressor.