*In order to investigate the application of ribbed cross-flow coolant channel of the film hole effusion and the effect of the internal cooling configuration on film cooling, experimental and numerical studies are conducted on the effect of the changes of relative position of film hole and orientation ribs on film cooling performance. This paper presents three cases of relative position structures of film hole and orientation ribs in two ribbed cross-flow channels (135 and 45 orientation ribs) including that the hole is in front of the rib (after) and the hole is behind the rib (before) and the hole is in the middle of the adjacent ribs (middle). In this study, the film cooling performances including film cooling effectiveness and heat transfer coefficient are measured under three blowing ratios by transient liquid crystal measurement technique.*

*The results show that the cooling effectiveness of the 135° rib in the three positions structures is basically the same, and the difference between the local effectiveness average values of the three is no more than 0.04. There are “after” and “middle” structures in the 45° rib structure The position structures have little effect on the film cooling effectiveness. The downstream heat transfer coefficient of three position structures of the 135° is basically the same as the distribution. The values difference between the three is not more than 0.1, and the 45° rib structure has no effect on the heat transfer coefficient between three structure cases too. As the film hole moves backward relative to the rib position (from the anterior rib to the rear rib), the swirling flow formed in the hole gradually decreases, and the discharge coefficient of the film hole increases slightly. At different position structures, the outlet velocity distribution of the film hole, the jet structure and the film cooling hole discharge coefficient are basically consistent with the variation of the cross flow.*


Experimental and Numerical Study on the Effects of the Relative Position of Film Hole and Orientation Ribs on the Film Cooling With Ribbed Cross-Flow Coolant Channel

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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