关键词: 航空发动机;疏密度+;致密多孔壁冷却+;薄膜冷却

Abstract: To investigate the influence of porosity of holes array on cooling effectiveness of an effusion cooled plat plate, a numerical study of the distributions of cooling effectiveness on the hot side of an effusion cooled flat plate was carried out with four different porosities of holes array. The required porosities for various cases were obtained through varying the diameter of holes and spacing among the holes. For all the four cases the boundary conditions are exactly the same and the coolant mass flux per unit area in the region with holes on the plate is also the same. The computational results show that to a certain extent the denser of the distribution of the holes, the higher of the cooling effectiveness.The cooling effectiveness of effusion cooling in the regions with holes and downstream the last row of holes on hot side is much higher than that of conventionary film cooling with the same operation conditions.

Key words: Aircraft engine;Porosity~+;Effusion cooling~+;Film cooling