固体燃料ATR发动机富燃燃气燃油喷雾冷却方法研究OA

To address the issue of the exhaust temperature of fuel-rich gas in solid-propellant ATR engines exceeding the heat resistance limit of turbine blades without internal cooling,a method for cooling the rich combustion gas with fuel was proposed.A step-by-step coupling numerical method called"near-field atomization and far-field mixing"was developed to analyze this process.The effects of using one,two,or four nozzles on cooling efficiency and temperature uniformity were examined.The results indicate that the simulation errors for the atomization cone angle and flow characteristics of the centrifugal nozzle are only 1.18％and 2.51％,respectively.Compared to the round-hole direct-flow nozzle,the centrifugal nozzle is more effective for the cooling and mixing processe of fuel-rich gas.Among them,the dual-nozzle achieves the optimal balance in cooling efficiency,temperature uniformity,and engineering applicability.Under the maximum pressure condition,the average outlet temperature drops to 1 118 K,with a maximum temperature difference of only 60 K.In addtion,the temperature distribution factor(TDF)is as low as 0.113.