Browse > Article
http://dx.doi.org/10.5293/KFMA.2003.6.3.021

A Study of Film Cooling of a Cylindrical Leading Edge with Shaped Injection Holes  

Kim, S.M. (성균관대학교 대학원)
Kim, Youn J. (성균관대학교 기계공학부)
Cho, H.H. (연세대학교 기계공학부)
Publication Information
The KSFM Journal of Fluid Machinery / v.6, no.3, 2003 , pp. 21-27 More about this Journal
Abstract
Dispersion of coolant jets in a film cooling flow field is the result of a highly complex interaction between the film cooling jets and the mainstream. In order to investigate the effect of blowing ratios on the film cooling of a turbine blade, cylindrical body model is used. Mainstream Reynolds number based on the cylinder diameter is $7.1{\times}10^4$. The effects of coolant flow rates are studied for blowing ratios of 0.7, 1.0, 1.3 and 1.7, respectively. The temperature distribution of the cylindrical model surface is visualized with infrared thermography (IRT). Results show that the film cooling performance could be significantly improved by the shaped injection holes. For higher blowing ratio, the spanwise-diffused injection holes are better due to the lower momentum flux away from the wall plane at the hole exit.
Keywords
Film Cooling; Turbine Blade; Blowing Ratio; Infrared Thermography; Adiabatic Film Cooling Effectiveness;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Goldstein, R. J., 1971, ‘Film Cooing,’ Advances in Heat Transfer, Vol. 7, pp. 321-379
2 Ou, S. and Han, J. C, 1994, ‘Leading Edge Film Cooling Heat Transfer Through One Row of Inclined Film Slots and Holes Including Mainstream Turblence Effects,’ ASME J. of Heat Transfer, Vol. 116, pp. 561-569
3 Kline, S. J. and McClintock, F. A., 1953, ‘Describing Uncertainties in Single Sample Experiments,’ Mechanical Engineering, Vol. 75, No.1, pp. 3-8
4 Cruse, M. W., Yuki, U. M. and Bogard, D. G., 1997, ‘Investigation of Various Pararretric Influenoes on Leading Edge Film Cooling,’ ASME paper 97-GT-296
5 Ou, S. and Rivir, R. B., 2001, ‘Egde Film Cooling Heat Transfer with High Free Stream Turbulence Using a Transient Liquid Crystal Image Method,’ Int. J. of Heat and Fluid Flow, Vol. 22, pp. 614-623
6 안 준,1999, ‘반대 방향의 방향각을 갖는 2열 분사 구조의 막냉각 특성,’ 서울대학교 대학원 석사학위 논문
7 조형희, 2000, ‘막냉각에서의 유동및 열전달 특성,’ 대한기계학회 2000년도 유체공학부문 학술강연회 강연집, pp. 61-79
8 Funazaki, K., Koyabu, E. and Yamawaki, S., 1998, ‘Effect of Periodic Wake Passing on Film Effectiveness of Inclined Discrete Cooling Holes Around the Leading Edge of a Blunt Body,’ ASME Journal of Turbomachinery, Vol. 120, pp. 70-78
9 Ekkad S. V, Han, J. C. and Du, H, 1998, ‘Detailed FIlm Cooling Measurements on a Cylindrical Leading Edge Model: Effect of Free-Stream Turbulence and Coolant Density,’ ASME J. of Turbomachinery, Vol. 120, pp. 799-807
10 Bohn, D. E., Moritz, N., Kruger, U. and Kusterer, K, 2000, ‘Namerical Analysis of Streamwise and Lateral Ejection of Cooling Fluid at the Leading Edge of a Turbine Blade Cascade,’ Proceedings of the 8th International Symposiwn on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC-8, Vol. II, pp. 793-800