Inscrição na biblioteca: Guest
Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EFFECTS OF HOLE GEOMETRY ON HEAT (MASS) TRANSFER AND FILM COOLING EFFECTIVENESS

Hyung-Hee Cho
School of Mechanical Engineering, Yonsei University, Seoul 120 749, South Korea

Byunggu Kim
Department of Mechanical Engineering Yonsei University Shinchon-dong 134, Seodaemun-gu Seoul 120-749 Republic of Korea

Dong Ho Rhee
Department of Mechanical Engineering Yonsei University Shinchon-dong 134, Seodaemun-gu Seoul 120-749 Republic of Korea

DOI: 10.1615/IHTC11.1210
pages 499-504

Resumo

The present study investigates local heat transfer characteristics around a film cooling jet entering a cross flow with compound angle orientations. Two types of film cooling hole geometry are employed: cylindrical hole with constant cross section and shaped hole with conically enlarged exit. The film cooling jet is injected through a single hole, which is inclined at 30 ° to the surface and rotatable in lateral direction from 0 ° to 90 °, for the blowing rates (mass flux ratios) of 0.5, 1.0 and 2.0. The naphthalene sublimation technique has been employed to determine both local heat (mass) transfer coefficients and local adiabatic wall (impermeable wall) film cooling effectiveness near the injection hole. The two parameters are obtained from separate tests using pure air and naphthalene saturated air injections. The results indicate that the injected jet through the straight hole protects the surface effectively at low blowing rates and spreads more widely with the compound angle injections than the axial injection. Using the shaped hole, higher and more uniform effectiveness values are obtained even for relatively high blowing rates.

Compra $25.00 Check subscription Ética e negligência em publicaçãoes Recomendado ao My Librarian Inserir indicador nessa página