润滑系统管路流动与换热耦合计算研究

Calculation on Heat-Fluid Coupling of Pipes in Aero-Engine Lubrication System

关键词:  润滑系统  热流耦合  能量方程  换热  计算模型

Key words:  Lubrication system  Heat-fluid coupling  Energy equation  Heat transfer  Calculation model

摘要:

为研究沿程管路换热与滑油流动之间的耦合问题，通过分析主要元件的流动和换热特性，引入元件换热的能量方程，结合管路流动的连续性方程和动量方程，建立了润滑系统管路热流耦合计算模型。针对一段发动机供油管路，利用MATLAB/Simulink建模仿真工具包，建立其热流耦合网络计算模型，获得滑油流量、温度以及管壁温度等参数，采用商业软件Flowmaster对其进行验证。模型计算结果与Flowmaster计算结果非常接近，滑油流量和温度的最大误差均不超过3%，管道壁温的计算误差不超过2.4%，说明建立的热流耦合计算模型具有良好的仿真精度，适用于考虑沿程管路换热的发动机润滑系统计算分析。

Abstract:

In order to investigate the heat-fluid coupling of pipes in aero-engine lubrication system，the flow and heat transfer characteristics of main components were analyzed，and the important energy equation of component was added. Combined with the continuity and momentum equations，the heat-fluid coupling model was established for lubrication pipeline system. Using the simulation tool box Simulink of MATLAB，the coupling calculation model of oil supply line was built. After simulation calculation，oil flow rate，temperature and pipe wall temperature were obtained. Results were verified by commercial software Flowmaster，showing that the maximum error of oil flow rate is less than 3%，as well as the temperature. Besides，the maximum error of pipe wall temperature does not exceed 2.4%. Thus，the model established has good simulation accuracy，and can be used to analyze the characteristics of aero-engine lubrication system considering heat transfer.