CAJ | 학술논문

本文采用数值方法对一个三级离心压缩机的级间影响进行了研究，比较了按均匀进口计算单独级方法的该级的性能曲线和按多级连算条件下得到的该级的性能曲线，发现在设计流量下，两种计算方法得到的同一级的性能最为接近；小流量情况下，多级的级间影响会使下一级的级压比和效率有所提高；大流量情况下则会使下一级的级压比和效率降低。级间影响在大流量下的效应大于在小流量下的效应。
본문채용수치방법대일개삼급리심압축궤적급간영향진행료연구，비교료안균균진구계산단독급방법적해급적성능곡선화안다급련산조건하득도적해급적성능곡선，발현재설계류량하，량충계산방법득도적동일급적성능최위접근；소류량정황하，다급적급간영향회사하일급적급압비화효솔유소제고；대류량정황하칙회사하일급적급압비화효솔강저。급간영향재대류량하적효응대우재소류량하적효응。
Numerical simulations were conducted for a 3-stage centrifugal compressor, focusing on the interaction between its stages. For a stage in the multistage compressor, its characteristics can be simulated either by assuming a uniform inlet flow or by obtaining its flows via computing the flow field of the multistage compressor as a whole. By comparing the characteristics of the same stage using the above two approaches, it is found that the two approaches give very close performance prediction for the same rear stage at design flow rate. On the other hand, the interaction between stages leads to a higher predicted pressure ratio and efficiency at the low flow rate while an inferior predicted performance at the high flow rate. The interaction effect becomes more serious at the high flow rate than at the low flow rate.