Investigation Of The Film Cooling Characteristics Of Lamilloy

Lamilloy cooling technology has been recognized as one of the key technology of thenew generation of aircraft engine’s research and development. It is as a strategic significanceto improving the aircraft engine independent research and development ability and narrowingthe gap between our country and the international forefront of engine development. The filmcooling characteristics in a narrow chamber Lamilloy with single and double row film coolingholes was investigated employing the transient liquid crystal technique based on theexperiment and numerical calculation. Effect of the relative position of jet hole, blowing ratioand the jet angle of cooling hole on the film cooling effectiveness and heat transfer coefficientwere studied.The test bench was designed to build to measure the film cooling effectiveness and heattransfer coefficient of the Lamilloy plates’ outer surface. The film cooling effectiveness andheat transfer coefficient were studied with blowing ratio of1.0,1.5and2.0, with inclinedangle of20°,30°and90°. The experimental results show that:(1) Heat transfercoefficient of the upstream area and film cooling effectiveness and of the upstream structure ishigher. The improving region moves from the upriver to the downstream area with theblowing ratio increased.(2) With the blowing ratio increased, film cooling effectiveness of theLamilloy with single row film cooling holes decreased first and then increased. Film coolingeffectiveness of the Lamilloy with double row increased with the blowing ratio increased. Theblow ratio has no obvious effect on the heat transfer coefficient.(3) With the inclined angleincreased, film cooling effectiveness of the Lamilloy with single row film cooling holesincreased first and then decreased, and the heat transfer coefficient decreased.The computation domain is established in agreement with the experimental model. Thefilm cooling effectiveness and heat transfer coefficient of Lamilloy with single row filmcooling holes were studied with blowing ratio of1.0,1.5and2.0, with inclined angle of20°and90°. The results show that:(1) Film cooling effectiveness of the upstream structure is higher. The higher the blowing ratios is, the more the film cooling effectiveness increases.Heat transfer coefficient of the downstream structure is higher.(2) With the blowing ratioincreased, film cooling effectiveness of the Lamilloy with single row film cooling holesdecreased, and the heat transfer coefficient increased.