某型涡扇发动机起动和加速过程数值模拟

Modeling turbofan engine starting and accelerating condition based on component matching principles

关键词:  涡轮风扇发动机  起动  数值仿真  部件特性+

Key words:  Turbofan engine  Starting  Numerical simulation  Component characteristics

摘要:

借助国内外涡扇发动机过渡态数值模拟研究的最新成果,开展了某型涡扇发动机起动加速过程的数值模拟研究。首先参照风机和泵类机械低转速部件特性相似理论,结合指数外插法,成功地发展了航空燃气涡轮发动机低转速部件特性扩展方法和计算程序;其次,基于燃气涡轮发动机部件匹配原理,写出描述部件内动态流动过程的三个基本方程:动量守恒方程(功率平衡方程)、流量连续方程和能量守恒方程;最后发展了具有一定计算精度的涡扇发动机起动加速过程的数值计算模型和程序,对某型涡扇发动机的起动和加速过程进行了数值分析,并与试验数据进行了对比分析。结果表明,给出的数值计算结果与试验数据具有较好的一致性,表明发展的模拟涡扇发动机起动加速过程的数学模型和程序是合理的。

Abstract:

Mathematical model based on component matching principles has been developed for simulating engine startup and accelerating condition.First,based on the W R Sexton method,the methods and mathematic models of supplementing the sub-idle rotating component characteristics were presented.Secondly,according to the airflow continuity,the pressure balance,the power balance and the equality of each rotor axis speed,the whole turbofan engine coworking equations were established.Lastly,a mathematical model for turbofan engine starting and accelerating characteristics was developed and a turbofan engine starting and accelerating performance were simulated.In order to prove the validity of the software developed,a turbofan engine is used as the example and its starting and accelerating condition was simulated.Compared the simulated data with the tested data,a conclusion can be made that the software is valid.