Film Cooling Performance of Opponent Waist-shaped Slot Holes
Film cooling is one kind of effective and widely used cooling technology for high temperature components. In this paper, a novel film hole named opponent waist-shaped slot hole has been studied, which is evolved on the base of converging-slot holes. Flow characteristic in the hole, discharge coefficient, vortex structure and lateral averaged cooling effectiveness have been discussed. Detailed comparison has been done between this hole and traditional film cooling holes. Results show the opponent waist-shaped slot hole has less dynamic loss and higher discharge coefficient. The most notable character is the complex vortex structure in the hole;a couple of vortexes rotate inward in the middle and swirls rotate outward at both sides, which is beneficial for the attachment of cooling air. As a result, higher cooling effectiveness appears. The opponent waist-shaped slot hole with the biggest exit area has the smallest flow separation in the hole, together with the largest discharge coefficient;however, large middle inward swirls and small outward swirls at both sides bring poor cooling performance. Overall, lateral average cooling effectiveness of the hole with the smallest exit area (wl;w2=3:5 mm) is the best among the three holes.
film hole comparison discharge coefficient vortex structure average adiabatic cooling effectiveness
LUO Jianrxia ZHU Hui-ren
School of Power and Energy, Northwestern Polytechnical University, Xian, China
国际会议
4th International Symposium on Jet Propulsion and Power Engineering(第四届喷气推进与动力工程国际会议 ISJPPE2012)
西安
英文
329-335
2012-09-10（万方平台首次上网日期，不代表论文的发表时间）