加力室隔热屏流场计算

加力室隔热屏流场计算赵坚行，刘全忠（南京航空航天大学动力工程系南京２１００１６）关键词隔热屏，改值计算，紊流反应流１引言本文采用数值计算的方法模拟带有隔热屏、外冷却气流、尾喷口的加力室热态流场。计算中采用修正卜。紊流模型来预估粘性系数。燃烧模型采用卜...

THE PREDICTION OF TURBULENT REACTING FLOW IN A AFTERBURNER WITH HEAT SHIELD

A numerical method is used for simulating combustion flows in a afterburner with the heat shield and jet nozzle. The heat shield is cooled through lots of cooling film holes and a single row of cooling slot. Physical models which include the turbulence, combustion and thermal radiation are used. Because of the large variation of density in combustion flow fields, the density-weighted average has been used in conservation equations for considering the influence of density variation. The solution domain spanned the entire region between centerline and afterburner wall, with the heat shield represented as a blockage to the mesh. The enthalpy equation and wall boundarys of heat shield require special handling for two passages in the afterburner. The flame spreading is determined by the gas density. Agreement between predictions and measurements show that the numerical method is fairly reasonable and appropriate for the primary design of the afterburner.