Effects of Extended Jet Holes to Heat Transfer and Flow Characteristics of the Jet Impingement Cooling
Küçük Resim Yok
Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Asme
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, effects of extended jet holes to heat transfer and flow characteristics of jet impingement cooling were numerically investigated. Cross-flow in the impinging jet cooling adversely affects the heat transfer on the target surface. The main purpose of this study is to reduce the negative effect of cross-flow on heat transfer by extending jet holes toward the target surface with nozzles. This study has been conducted under turbulent flow condition (15,000 <= Re <= 45,000). The surface of the turbine blade, which is the target surface, has been modeled as a flat plate. The effect of the ribs, placed on the target surface, on the heat transfer has been also investigated, and the results were compared with the flat surface. The parameters such as average and local Nusselt numbers on the target surface, flow characteristics, and compressor power have been examined in detail. It was obtained from the numerical results that the average Nusselt number increases with decreasing the gap between the target surface and the nozzle. In addition, the higher average Nusselt number was obtained on the flat surface than the ribbed surface. The lowest compressor power was achieved in the 5Dj nozzle gap for the flat surface and in the 4Dj nozzle gap for the ribbed surface.
Açıklama
Anahtar Kelimeler
CFD, impinging jet cooling, gas turbine blade, convective heat transfer, nozzle
Kaynak
Journal of Heat Transfer-Transactions of the Asme
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
141
Sayı
8
