航空发动机燃油计量装置稳态特性仿真

Simulation on steady-state characteristics of aero-engine fuel regulation device

为研究燃油计量装置的稳态工作特性,提升质量流量调控性能,基于Python语言自主开发了航空发动机燃油系统一维稳态流动仿真程序,通过建立完善的部件库和高效的求解算法,实现了含压力控制部件的复杂流路仿真模拟。从系统的角度分析了计量装置的工作特点和各参数对流动的影响规律,结果表明:在设计点工况下,计量活门能够正常工作的开度范围是0.3~0.85,过大或过小的开度均不利于质量流量的调控;仅有预紧力可以改变计量活门的开启边界,压差活门参数对供油性能的影响程度随计量活门的开度呈现单调变化;在压差活门的作用下,燃烧室供油量对各系统参数的敏感性较低,参数改变范围内的变化不大于10%,燃油泵的内泄漏是影响供油量的重要因素之一。

In order to study the steady-state operating characteristics of fuel regulation device and improve the flow control performance,a one-dimensional steady-state flow simulation program for aeroengine fuel system was developed based on Python language.By establishing a complete component library and efficient solution algorithm,the simulation of a fuel flow regulation system with pressure control components was realized.From the view of system,the working characteristics of the regulation device and the influence of parameters on the flow were analyzed.The results showed that under the working condition of the design point,the normal-working opening range of the metering valve was 0.3—0.85,and too large or too small opening was not conducive to the control of fuel flow.Only the preload can change the opening boundary of the metering valve.The influences of differential pressure valve parameters on the oil supply varied monotonically with the opening of the metering valve.Under the function of differential pressure valve,the oil supply to the combustor was less sensitive to the parameters of the system,and the change was less than 10%.It was found that internal leakage of the fuel pump served as an important factor affecting the fuel supply.