中央传动齿轮箱复杂油路性能仿真

Performance simulation of complex oil circuit of inlet gearbox

以某航空发动机中央传动齿轮箱复杂油路结构为研究对象,分别对“双通道多喷嘴”和“单通道多喷嘴”油路模型进行三维流动仿真分析并建立压力-体积流量数学模型.计算结果表明:Realizable k-ε湍流模型能够有效捕捉“双通道多喷嘴”复杂油路结构的三维流动特性,滑油喷嘴喷孔的外部流线喷射位置和试验现象较吻合,计算精度较高;对供油压力为0.05~0.25 MPa的压力-体积流量曲线采用“外延法”方式,能够较好地预测供油压力为0.30 MPa时的体积流量,该值与仿真计算结果和设计要求均较吻合;随着油路入口供油压力增加,所有滑油喷嘴体积流量系数也增加,滑油喷嘴体积流量系数和油路内滑油雷诺数呈正相关关系;当供油压力为0.05~0.30 MPa时,“单通道多喷嘴”复杂油路模型的供油压力和体积流量呈二次函数关系.

A complex oil circuit structure of inlet gearbox of an aeroengine was taken as as the research object.The oil circuit models of two-channel multi nozzle and one-channel multi nozzle were simulated and analyzed respectively and the pressure-oil volume flow rate model was established.The calculation results showed that the Realizable k-εturbulence model can effectively capture the three-dimensional flow characteristics of the complex oil circuit structure of two-channel multi nozzle.The external streamline injection position of the oil nozzle orifice was in good agreement with the experimental phenomenon.The calculation accuracy was high.The extension method was used to predict the oil volume flow rate under the oil supply pressure of 0.30 MPa for the pressure-oil volume flow rate curve with the oil supply pressure of 0.05 MPa to 0.25 MPa.This value was in good agreement with the simulation calculation results and design requirements.As the oil supply pressure at the inlet of the oil circuit increased,oil volume flow coefficient of of oil nozzles also increased.Oil volume flow coefficient of the oil nozzles was positively correlated with the Reynolds number.When the oil supply pressure was 0.05 MPa to 0.30 MPa,the oil supply pressure and oil volume flow rate of the one-channel multi nozzle complex oil circuit model were quadratic functions.