Film cooling effectiveness and heat transfer of rectangular-shaped film cooling holes

Dong Ho Rhee, Youn Seok Lee, Hyung Hee Cho

Research output: Contribution to conferencePaper

15 Citations (Scopus)

Abstract

An experimental study has been conducted to measure the local film-cooling effectiveness and the heat transfer coefficient for a single row of rectangular-shaped holes. The holes have a 35° inclination angle with 3 hole diameter spacing of rectangular cross-sections. Four different cooling hole shapes such as a straight rectangular hole, a rectangular hole with laterally expanded exit, a circular hole and a two-dimensional slot are tested. The rectangular cross-section has the aspect ratio of 2 at the hole inlet with the hydraulic diameter of 10 mm. The area ratio of the exit to the hole inlet is 1.8 for the rectangular hole with expanded exit, which is similar to a two-dimensional slot. A thermochromic liquid crystals technique is applied to determine adiabatic film cooling effectiveness values and heat transfer coefficients on the test surface. Both film cooling effectiveness and heat transfer coefficient are measured for various blowing rates and compared with the results of the cylindrical holes and the two-dimensional slot. The flow patterns inside and downstream of holes are calculated numerically by a commercial package. The results show that the rectangular holes provide better performance than the cylindrical holes. For the rectangular holes with laterally expanded exit, the penetration of jet is reduced significantly, and the higher and more uniform cooling performance is obtained even at relatively high blowing rates. The reason is that the rectangular hole with expanded exit reduces momentum of coolant and promotes the lateral spreading like a two-dimensional slot.

Original languageEnglish
Pages21-32
Number of pages12
DOIs
Publication statusPublished - 2002 Dec 1
EventASME TURBO EXPO 2002:Heat Transfer, Manufacturing Materials and Metallurgy - Amsterdam, Netherlands
Duration: 2002 Jun 32002 Jun 6

Other

OtherASME TURBO EXPO 2002:Heat Transfer, Manufacturing Materials and Metallurgy
CountryNetherlands
CityAmsterdam
Period02/6/302/6/6

Fingerprint

Heat transfer
Cooling
Heat transfer coefficients
Blow molding
Coolants
Flow patterns
Liquid crystals
Aspect ratio
Momentum
Hydraulics

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Rhee, D. H., Lee, Y. S., & Cho, H. H. (2002). Film cooling effectiveness and heat transfer of rectangular-shaped film cooling holes. 21-32. Paper presented at ASME TURBO EXPO 2002:Heat Transfer, Manufacturing Materials and Metallurgy, Amsterdam, Netherlands. https://doi.org/10.1115/GT2002-30168
Rhee, Dong Ho ; Lee, Youn Seok ; Cho, Hyung Hee. / Film cooling effectiveness and heat transfer of rectangular-shaped film cooling holes. Paper presented at ASME TURBO EXPO 2002:Heat Transfer, Manufacturing Materials and Metallurgy, Amsterdam, Netherlands.12 p.
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Rhee, DH, Lee, YS & Cho, HH 2002, 'Film cooling effectiveness and heat transfer of rectangular-shaped film cooling holes' Paper presented at ASME TURBO EXPO 2002:Heat Transfer, Manufacturing Materials and Metallurgy, Amsterdam, Netherlands, 02/6/3 - 02/6/6, pp. 21-32. https://doi.org/10.1115/GT2002-30168

Film cooling effectiveness and heat transfer of rectangular-shaped film cooling holes. / Rhee, Dong Ho; Lee, Youn Seok; Cho, Hyung Hee.

2002. 21-32 Paper presented at ASME TURBO EXPO 2002:Heat Transfer, Manufacturing Materials and Metallurgy, Amsterdam, Netherlands.

Research output: Contribution to conferencePaper

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Rhee DH, Lee YS, Cho HH. Film cooling effectiveness and heat transfer of rectangular-shaped film cooling holes. 2002. Paper presented at ASME TURBO EXPO 2002:Heat Transfer, Manufacturing Materials and Metallurgy, Amsterdam, Netherlands. https://doi.org/10.1115/GT2002-30168