Experimental Study on the Influence of the Streamwise Position of Film Hole Extraction in Internal Ribbed Cooling Channels of Turbine Blades

Böttger, Marlene; Lange, Martin; Mailach, Ronald; Vogeler, Konrad

doi:10.33737/gpps19-tc-019

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…Some literatures focus on the effect of film hole extraction on the flow and heat transfer in the body and at the leading edge of the blade. An experimental study was carried out by B€ ottger et al [7] to investigate how the film hole extraction affects the internal flow field and heat transfer. The bleed holes were fitted in a ribbed rectangular channel.…”

Section: Introductionmentioning

confidence: 99%

Vortical structures and heat transfer augmentation of a cooling channel in a gas turbine blade with various arrangements of tip bleed holes

Zhao

Luo

Qiu

et al. 2020

Numerical Heat Transfer, Part A: Applications

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This study investigates the internal cooling processes affected by the tip bleed holes in gas turbine blades. Double bleed holes are fixed at the center of the blade tip near the pressure side and suction side, respectively. Five different arrangements of the holes along the center line of the tip are studied. The purely double holes are set as the Baseline. The purpose of the present study is to provide a new perspective of the tip film cooling to understand the internal flow processes, vorticity evolution and the mechanism of the heat transfer augmentation. A topological analysis and the boundary layer analysis methods are introduced to better understand the tip heat transfer. The total extraction area and volume is kept at the same level for all the studied cases. The results show that the Dean vortices and the near-wall vortices induced by the secondary flow contribute to the high heat transfer coefficient on the tip surface. The mixing effect of the Dean vortices and the hole extraction helps to enhance heat transfer upstream of the tip. Different arrangement of the bleed holes can affect the internal flow processes and heat transfer performance. The suction effect of the center-line bleed hole can accelerate the near-hole flow and reduce the thickness of the boundary layer. The center-line hole fitted at the middle of the tip affects significantly the rear side of the hole. Thus, the holes aligned in the middle of the tip provide the highest heat transfer and thermal performance. The thermal performance is enhanced by up to 4.7% compared with the Baseline.

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Section: Introductionmentioning

confidence: 99%