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Influence of the Unsteady Wake on the Flow and Heat Transfer in a Linear Turbine Cascade
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 Title & Authors
Influence of the Unsteady Wake on the Flow and Heat Transfer in a Linear Turbine Cascade
Yun, Sun-Hyeon; Sim, Jae-Gyeong; Kim, Dong-Geon;
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 Abstract
The influence of unsteady wake on the flow and heat transfer characteristics in a four-vane linear cascade was experimentally investigated. The unsteady wake was generated with four rotating rectangular plates located upstream of the cascade. Tested inlet Reynolds number based on chord length was set to 66,000 by controlling free-stream velocity. A hot-wire anemometer system was employed to measure turbulent velocity components. For the convective heat transfer coefficients measurement on turbine blade surface, thermochromic liquid crystal and gold film Intrex were used. It was found that the unsteady wake enhances the turbulent motion in the cascade passage and accordingly promotes the development and transition of boundary layer. It was found that the heat transfer coefficients on the blade surface increase as the plate rotating speed increases. However, the increasing of heat transfer coefficients is not significant in the case that Strouhal number is higher than 0.503.
 Keywords
Unsteady Wake;Wake Passing Frequency;Boundary Layer Thickness;Boundary Layer Shape Factor;Thermochromic Liquid Crystal;Convective Heat Transfer;Hue Capturing Method;
 Language
Korean
 Cited by
 References
1.
Pfeil, H., Herbst, R., Schroder, T., 1983, 'Investigation of the Laminar-Turbulent Transition of Boundary Layer Disturbed by Wakes,' Journal of Engineering for Power, Vol. 105, pp. 130-137

2.
Mayle, R. E., Dullenkopf, K., 1988, 'More on the Turbulent-Strip Theory for Wake-Induced Transition,' Journal of Turbomachinery, Vol. 113, pp. 428-432

3.
LaGraff, J., Ashworth, D. A. and Schultz, D. L., 1988, 'Measurement and Modelling of the Gas Turbine Blade Transition Process as Disturbed by Wakes,' ASME Paper 88-GT-232

4.
Funazaki, K., 1996, 'Unsteady Boundary Layers on a Flat Plate Disturbed by Periodic Wakes: Part Ⅰ- Measurements of Wake-Induced Transition Model,' Journal of Turbomachinery, Vol. 118, pp. 327-336

5.
Funazaki, K., 1996, 'Unsteady Boundary Layers on a Flat Plate Disturbed by Periodic Wakes: Part Ⅱ- Measurements of Wake-Induced Transition Model,' Journal of Turbomachinery, Vol. 118, pp. 337-346

6.
Dong, Y. and Cumpsty, N. A., 1989, 'Compressor Blade Boundary Layers Part1-Test Facility and Measurements with No Incident Wakes,' ASME Paper 89-GT-50

7.
Liu, X., and Rodi, W., 1991, 'Experiments on Transitional Boundary Layers with Wake-Induced Unsteadiness,' Journal of Fluid Mech., Vol. 231, pp. 229-256 crossref(new window)

8.
이대희, 심재경, 박성봉, 이재호, 윤순현, 1998, '터빈 블레이드 표면과 선형익렬에서의 열전달 및 유동 측정 연구,' 대한기계학회논문집, 제23권, 제5호, pp. 567-576

9.
윤순현, 심재경, 우창수, 이대희, 1999, '사각주 후류가 선형터빈익렬의 유동 및 열전달에 미치는 영향에 관한 연구', 대한기계학회논문집, 제23권, 제7호, pp. 864-870

10.
윤순현, 심재경, 우창수, 2000, '측정강도를 고려한 액정교정기법의 개선', 대한기계학회 논문집, 제24권, 제2호, pp. 188-194

11.
Kline, S. J., and McClintock, F. A., 1953, 'Describing Uncertainties in Single Sample Experiments', Mech. Engr., Vol. 5, pp. 3-8

12.
Liu, X. and Rodi, W., 1994, 'Velocity Measurements of Wake-Induced Unsteady Flow in a Linear Turbine Cascade', Experiments in Fluids, Vol. 17, pp. 45-58 crossref(new window)

13.
Han, J. C., Zhang, L. and Ou, S., 1993, 'Influence of Unsteady Wake on Heat Transfer Coefficient From a Gas Turbine Blade', Journal of Heat Transfer, Vol. 115, pp. 904-911