Experimental investigation on transpiration cooling of trapped vortex combustor

Two kinds of transpiration cooling schemes of trapped vortex combustor were designed, and two angles of transpiration cooling holes were 30° and 150°. The cooling efficiency test was conducted to study the performance of cooling in different locations, different temperature ratios and blowing ratios. The experimental results show that two cooling structures have high cooling efficiency; and the cooling efficiency variation with mainstream temperature or blowing ratio is similar to each other. For the wall of cavity, the cooling efficiency of fore-wall is the highest and the cooling efficiency of after-wall is the lowest. Under the same experimental conditions, the cooling efficiency of the structure at angle 150° is higher than that of the structure at angle 30°. At the same time, with the decline of cooling gas rate, the difference between them will increase. Finally, the test results were analyzed by numerical methods.