Engine performance evaluation method based on the flow characteristics of high-pressure turbine guide vane
In engine performance analysis,the ratio of the cooling air flow of high-pressure turbine guide vane to compressor inlet flow is a fixed value.However,the actual bleed air flow of the turbine is affected by some factors,such as the pressure difference between the inlet and outlet of the cooling air flow path,flow area and flow resistance,resulting in deviations between the current simulation accura-cy and actual performance of the engine.To further improve the simulation accuracy of engine perfor-mance,a modeling method based on the flow characteristics of high-pressure turbine guide vane was proposed.The computational model of the core engine performance was improved based on this meth-od,and the performance parameters of one core engine were calculated with this model.The numerical results show that,for this core engine the actual cooling air flow of turbines decreases after considering the flow characteristics of high-pressure turbine guide vane,and the cooling air flow is more sensitive to the change of the total pressure recovery coefficient of the cooling air flow path.In the performance calculation of the core engine,after using the cooling air flow correction of high-pressure turbine guide vane,the total temperature at the outlet of the combustion chamber decreases by 1％to 2％,the tempera-ture ratio of the core engine increases by 0.2％to 0.45％,the unit cycle power increases by 0.24％to 0.48％,and the pressure ratio of the core engine and the fuel consumption rate per unit cycle power change relatively little.
high-pressure turbine guide vaneflow characteristicscooling air flowperformance anal-ysisengine
万方数据
维普
