某型航空发动机空中起动供油规律的研究

Research on fuel supply control law of airstart for an aero-engine

研究某型航空发动机空中起动困难问题,现有自动起动器没有考虑飞行高度对供油规律的影响,发动机在空中起动时存在富油状态.分析了影响起动供油规律的因素,在现有自动起动器结构基础上,设计了高空修正模块来补偿飞行高度对供油规律的影响.建立了自动起动器的数学模型,对改进的自动起动器进行了仿真分析和试验.仿真结果和试验验证了改进方案的可行性,与地面起动相比,空中起动的供油量随着飞行高度的增加而降低.采用改进的空中起动供油规律可补偿飞行高度对供油特性的影响,解决发动机空中起动时的富油状态问题.

The problem of airstart of an aero-engine was investigated. The enrichment in airstart of an aero-engine exists because the effects of flying height on fuel-feed characteristics are not considered for the original selfstarter. Various factors affecting the fuel-feed characteristics were investigated. A high altitude compensator was added to the original selfstarter to compensate the effects of flying height on fuel-feed characteristics. The mathematical models of original and improved selfstarters were built respectively. The simulations and tests verify the feasibility of the improved selfstarter,e.g.：airstart fuel supply flow decreases as the altitude increases as compared with the ground starter. The improved selfstarter can compensate the effects of flying height on fuel-feed characteristics and resolve the problem of airstart enrichment.