基于相似参数的加速供油规律反设计方法研究

Reverse Design Method of Fuel Supply Law forAcceleration Based on Similarity Parameters

关键词:  航空发动机  加速供油规律  反设计  相似原理  仿真

Key words:  Aeroengine  Acceleration fuel supply law  Reverse design  Similarity principle  Simulation

摘要:

为了推广数字电子控制在发动机控制系统中的应用，利用原液压机械控制装置具备的加减速功能进行供油规律的反设计具有重要意义。基于相似理论，提出了以高低压压气机进口总温、高压压气机出口总压和高压转速为函数参量的加速供油规律；其次考虑到温度传感器测量难、响应慢的实际问题，提出了一种仅利用高低压压气机出口总压和高压转速为函数参量的基于发动机加速试验数据反设计加速供油规律的方法；进一步提出一种仅利用低压压气机进口总压、高压压气机出口总压和高压转速的供油规律的设计方法。两种加减速供油规律仿真曲线与地面、高空加减速试验数据对比表明，加速过程高压转子转速相对误差小于2%，减速过程高压转子转速相对误差小于3%。

Abstract:

In order to popularize the application of digital electronic regulator in engine control system， it is of great significance to do reverse design for fuel supply law by original hydraulic mechanical control equipment with acceleration and deceleration function. Based on similarity principle， the fuel supply law is put forward， which includes total temperature in the inlet of low pressure compressor (LPC) and high pressure compressor (HPC)， total pressure in the outlet of HPC and high pressure rotor speed ([n2]). Considering temperature sensors’ slow response and difficulties in measuring， a reverse design method according to the engine test data is presented， which involves pressure in the outlet of LPC and HPC and [n2]. Further， the design method involving pressure in the inlet of LPC and the outlet of HPC and [n2] is proposed. The results of ground and altitude simulation show that [n2]’ relative error is under 2% for acceleration and under 3% for deceleration.