Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2001.06d
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- Pages.489-496
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- 2001
The Effects of Impingement Hole Size on Heat Transfer of An Impingement/Effusion Cooling System
충돌제트/유출냉각기법에서 분사판의 홀배열이 열전달에 미치는 영향
- Published : 2001.06.27
Abstract
Two perforated plates are used to investigate local heat/mass transfer characteristics in an impingement/effusion cooling system. A naphthalene sublimation method is conducted to determine the local heat/mass transfer coefficients on the upward facing surface of the effusion plate. The two plates are placed in parallel position with gap distances of 1, 2, 4 and 6 times of effusion hole diameter. The effects of hole arrangements of the plates are studied for staggered, square, and hexagonal arrays. The experiments are conducted at Reynolds number of 10,000 based on the effusion hole diameter. The results show that the smaller hole size in the staggered array has the higher transfer coefficients on the stagnation region due to the formation of higher momentum flows through the impingement holes. In the square array, heat/mass transfer on the target plate is more uniform as the number of impingement holes increases. High and uniform heat/mass transfer coefficients are obtained in the hexagonal array.
Keywords
- Gas turbine;
- Impingement Cooling;
- Effusion cooling;
- Hele arrangement;
- Heat and mass transfer analogy
- 가스터빈;
- 충돌제트냉각;
- 유출냉각;
- 홀배열;
- 열전달과 물진전달 상사성;