### 탈설계 조건에서 원심압축기의 미끄럼 계수 모델들의 평가

윤성호;백제현
Yun, Seong-Ho;Baek, Je-Hyeon

• 발행 : 2001.11.01
• 31 10

#### 초록

A slip factor is defined as an empirical factor, which should be multiplied to theoretical energy transfer to estimate real work input of a centrifugal compressor. During the last century, researchers have tried to develop simple empirical models to predict the slip factor. However most of these models have been developed based only on design point data. Furthermore flow is assumed inviscid. As a result, these models often fail to predict the correct slip factor at off-design condition. In this study, various models for the slip factor were analysed and compared with experimental and numerical data at off-design conditions. As a result of this study, Wiesner's and Paeng and Chung's models are shown to be applicable for radial impeller, but all the models are found to be inappropriate for backswept impellers.

#### 키워드

미끄럼 계수;원심 압축기;회전차;탈설계 조건;평균 유속법;후향 경사각;깃의 개수

#### 참고문헌

1. Came P. M., and Herbert M.V, 1980, 'Design and Experimental Performance of Some High Pressure Ratio Centrifugal Compressors,' AGARD CP-282
2. 오종식, 윤의수, 조수용, 오군섭, 1998, '40kW 급 터보제너레이터용 원심압축기의 공력설계 및 유동해석, 유체기계공업 학회 '98 강연회 및 연구개발 발표회 논문집, pp. 128-135
3. Oh, J. S., 1998, 'Numerical Investigation of Slip Factor for Centrifugal Impellers, ' Proc. of 4th KSME-JSME Fluid Eng. Conf., Pusan, South Korea, pp. 113 - 116
4. Buscrnann, A., 1928, 'Das ForderhohenverHaltnis Radialer Kreiselpumpen mit LogarithmischSpiraligen Schaufen,' Z. Angew. Math. Mech., Vol. 8, pp. 372 - 384 https://doi.org/10.1002/zamm.19280080504
5. Stanitz, J. D., 1952, 'Some theoretical Aerodynamic Investigation of Impellers in Radial and Mixed Flow Centrifugal Compressors,' Trans. ASME, Vol. 74, pp. 473 -497
6. Wiesner, F. J. 1967, ' A Review of Slip Factors for Centrifugal Impellers,' Journal of Engineering for Power, Trans. ASME, Series A, Vol. 89, pp. 558 - 572
7. 팽기석, 정명균, 2000, '원심 임펠러의 상대와류 크기 모델에 근거한 이론적인 미끄럼 계수,' 대한기계학회논문집 B권, Vol. 24, No. 3, pp. 411-418
8. 윤성호, 백제현, 2000, '두영역 모델과 직렬두요소 모델의 변수에 의한 원심 압축기 탈설계 성능의 민감도 분석,' 대한기계학회논문집 B권, Vol. 24, No. 6, pp.834-844
9. Joslyn H. D., Brasz J. J., and Dring R. P, 1991, 'Centrifugal Compressor Impeller Aerodynamics : an Experimental Investigation,' ASME Jounrnal of Turbomachinery, Vol. 113, pp. 660-669
10. Krain H., 1981, 'A Study of Centrifugal Impeller and Diffuser Flow,' ASME Journal of Turbomachinery, Vol. 103, pp. 688-697
11. Krain H., 1988, 'Swirling Impeller Flow,' ASME Journal of Turbomachincry, Vol. 110, pp. 122-128
12. Hathaway, M. D., Chriss, R. M., Wood, J. R., and Strazisar, A. J., 1993, 'Experimental and Computational Investigation of the NASA Low-Speed Centrifugal Compressor Flow Field,' ASME. Journal of Turbomachincry, Vol. 115, pp. 527- 542
13. Dawes, W. N., 1988, 'Development of a 3-D Navier Stokes Solver of Application to All Types of Turbornachinery,' ASME Paper No. 88-GT-70
14. Hah, C., and Krain, H., 1990, 'Secondary Flows and Vortex Motion in a High Efficiency Backswept Impeller at Design and Off-Design Conditions,' ASME. Journal of Turbomachinery, Vol. 112, pp. 7-13
15. Chriss, R. M., Hathaway, M. D., and Wood, J. R., 1996, 'Experimental and Computational Results from the NASA Lewis Low-Speed Centrifugal Impeller at Design and Part-Flow Conditions,' ASME Journal of Turbomaehinery, Vol. 118, pp. 55-65
16. Stodola, A, 1927, 'Steam and Gas Turbines,' Vol. I and II, McGraw-Hill, New York
17. Eckardt, D., 1976, 'Detailed Flow Investigation Within a High Speed Centrifugal Compressor Impeller,' ASME Journal of Fluids Engineering, Vol. 98, pp. 390-402
18. Eckardt D., 1980, 'Flow Field Analysis of Radial and Backswept Centrifugal Compressor Impellers - Part 2 : Flow Measurements using a Laser Velocitimeters.' 25th ASME Gas Turbine Conf., New Orleans, Louisiana, pp. 77-86