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터보 압축기 임펠러-디퓨저 유동장에 대한 정상상태 해석
남삼식(S. S. Nam),박일영(I. Y. Park),이성룡(S. R. Lee),주병수(B. S. Ju),황영수(Y. S. Hwang),인배석(B. S. In) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
Numerical and experimental investigations were conducted to assess the aerodynamic performance of several centrifugal compressors. In order to impose an appropriate physics at the interface between impeller and vaned diffuser numerically, two different techniques, frozen rotor and stage models, were applied and the simulation results were compared with the corresponding prototype test data. An equivalent sand-grain roughness height was utilized in the present computational study to consider a relative surface roughness effect on the stage performance simulated. From a series of investigations, it was found that the stage model is more suitable than the frozen rotor scheme for the steady interactions between impeller and diffuser in turbocompressor applications. It is supposed that the solution by frozen rotor scheme is inclined to overrate the non-uniformity of the flow fields. The predicted aerodynamic performance accounting for surface roughness effect shows favorable agreement with experimental data. Simulations based on the aerodynamically smooth surface assumption tend to overestimate the stage performance.