雷诺数对涡扇发动机性能及稳定性影响

综合了Wassell方法和经验数学模型两种雷诺数修正方法,对风扇、压气机、高低压涡轮的部件特性进行了雷诺数修正。运用修正后的部件特性分别对3种涡扇发动机进行了性能计算,定量计算出了雷诺数对涡扇发动机性能的影响程度。计算结果表明:在低空区雷诺数对涡扇发动机性能和稳定性影响可以忽略不计;但在高空低速区,雷诺数对涡扇发动机性能和稳定性影响显著;涡轮前总温剧烈升高;推力增大3%～6%、耗油率增大8%～10%;稳定裕度下降19%～39%。因此在高空低速区航空发动机性能数值模拟必须考虑部件特性雷诺数的影响。 

Reynolds Number Effects on Performance and Aerodynamic Stabilities of the Turbofan Engines

Wassell’s model and experimental correlations were synthesized.The effects of Reynolds number were taking into consideration to modify the characteristics of compressors and turbines.The performance and aerodynamic stability of three turbofan engines were calculated with modified compressors and turbines characteristics.Investigation shows that:Reynolds number almost has no influence on the engine performance and aerodynamic stability at low altitude,but has significant influence at high altitude with low flight speed.The turbine inlet total temperature and engine thrust are increased.The percentage increase of thrust and specific fuel consumption are 3%～6% and 8%～10% respectively,while the engine surge margin is decreased in the range of 19%～39%.It means that the effects of Reynolds number must be taken into account in turbofan engine performance simulation at high altitude with low flight speed.