JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Flow and Heat Transfer Characteristics in a Slot Film Cooling with Various Flow Inlet Conditions
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Flow and Heat Transfer Characteristics in a Slot Film Cooling with Various Flow Inlet Conditions
Ham, Jin-Ki; Cho, Hyung-Hee;
  PDF(new window)
 Abstract
An experimental investigation is conducted to improve a slot film cooling system which can be used for the cooling of gas turbine combustor liner. The tangential slots are constructed of discrete holes with different injection types which are the parallel, vertical, and combined to the slot lip. The investigation is focused on the coolant supply systems of normal-, parallel-, and counter-flow paths to the mainstream direction. A naphthalene sublimation technique has been employed to measure the local heat/mass transfer coefficients in a slot with various injection types and coolant feeding directions. The velocity distributions at the exit of slot lip for the parallel and vertical injection types are fairly uniform with mild periodical patterns with respect to the hole positions. However, the combined injection type increases the nonuniformity of flow distribution with the period equaling twice that of hole-to-hole pitch due to splitting and merging of the ejected flows. The secondary flow at the lip exit has uniform velocity distributions for the parallel and vertical injection types, which are similar to the results of a two-dimensional slot injection. In the results of local heat/mass transfer coefficient, the best cooling performance inside the slot is obtained with the vertical injection type among the three different injection types due to the effect of jet impingement. The lateral distributions of Sh with the parallel- and counter-flow paths are more uniform than the normal flow path. The averaged Sh with the injection holes are times higher than that of a smooth two-dimensional slot path
 Keywords
Slot Film Cooling;Gas Turbine;Combustor Liner;Heat Transfer;Naphthalene Sublimation Method;
 Language
Korean
 Cited by
 References
1.
Goldstein, R. J., 1974, 'Film Cooling,' Advances Heat Transfer, Academic Press, Vol. 7, pp. 321-379

2.
Papell, S. S., 1960, 'Effect on Gaseous Film Cooling of Coolant Injection Through Angled Slots and Normal Holes,' NASA Technical Note D-299

3.
Folayan, C. O. and Whitelaw, J. H., 1974, 'The Effectiveness of Combined Tangential and Normal Film-Cooling Slots with Finite Lip,' Dept. of Mechanical Eng. Imperial College, Report HTS/74/2

4.
Sturgess, G. J., 1980, 'Account of Film Turbu- ?lence for Predicting Film Cooling Effectiveness in Gas Turbine·· Combustors,' ASME J of Engineer. ing for Power, Vol. 102, pp. 524-534

5.
Sivasegaram, S., 1969, 'Film Cooling Slots : The Importance of Lip Thickness and Injection Angle,' Journal of Mechanical engineering science, Vol. 11, No.1, pp. 22-27

6.
Seban, R. A., 1960, 'Heat Transfer and Effectiveness for a Turbulent Boundary Layer with Tangential Fluid Injection,' ASME J of Heat Transfer, Vol. 82, pp. 303-312

7.
Farmer, J. P., Seager, D. J. and Liburdy, 1. A., 1997, 'The Effect of Shaping Inclined Slots on ?Film Cooling Effectiveness and Heat Transfer Coefficient,' ASME Paper No. 97-GT-339

8.
Simon, B., 'Advanced Gas Turbine Combustor Cooling Configurations,' MTU Motoren und Turbinen Union Munchen, Germany

9.
함진기,김병기,조형희,1999'가스터빈 연소실 슬롯 막냉각의 분사방법 변화에 따른 열전달 특성 고찰,' 대한기계학회 논문집 B권, 제23권 제4호, pp. 511-519

10.
Kline, S. J. and McClintock, F. A., 1953, 'Describing Uncertainty in Single-Sample Experiments,' Mechanical Engineering, Vol. 75, pp.3-8