冲压空气涡轮泵的温控节流孔计算方法

冲压空气涡轮(RAT)泵将涡轮输出的机械能转换为液压能用以操控飞机舵面,其快速起动是飞机安全的最后保证。长时间处于低温大气环境,液压油的高黏性阻碍了液压泵的快速起动,将飞机主液压系统的高压油液引入RAT泵是解决该问题的有效方法。本文以RAT泵为研究对象,探究RAT泵的最小温控节流孔计算方法。首先,阐述RAT泵待机状态下通过温控节流孔保温原理,提出温控节流孔的孔径计算方法;其次,建立RAT泵热力学模型,推导温控节流孔的孔径计算公式;然后,基于MATLAB平台搭建RAT泵温控系统热力学模型;最后,通过仿真计算,由仿真结果验证本文所提出的温控节流孔计算方法的正确性,且节能效果显著。

A calculation method for temperature control orifice of ram air turbine pump

Ram air turbine (RAT) pump,by transforming the mechanical energy into hydraulic energy,can be used to control the aircraft rudder in emergency situation.Its performance of rapid response is critical to ensure the aircraft's safety.Exposed to low-temperature atmosphere for long time,the high viscosity of hydraulic oil will hinder the rapid start of the hydraulic pump,and an effective method for this problem is to introduce the high-pressure oil into aircraft RAT pump from the main hydraulic system.Taking RAT pump as research object,this paper explores the calculation method of minimum temperature control orifice for the RAT pump.First,it explains the thermal insulation theory of the RAT pump which is equipped with temperature control orifice in standby mode and proposes an algorithm of the orifice.Second,it establishes RAT pump's thermodynamic model and deduces the calculation formula of the orifice's diameter.Next,it establishes temperature control system's thermodynamic model with MATLAB and calculates the results.Finally,it verifies the correctness of the algorithm through simulation calculation,and energy saving effect is remarkable.