飞机环境控制系统热交换器优化研究

Research on heat exchanger optimization in aircraft environmental control system

一种以热力学第二定律为基础的熵产分析方法,应用于飞机环境控制系统的部件级优化设计。在给出的设计条件下,通过分析空气在环控系统中的流动过程,得出系统熵产与给定初始条件的函数关系,结合热交换器设计计算过程,得到热交换器热边流动长度、冷边流动长度和高度之间比例关系对整个系统熵产的影响,并应用该分析方法对某型飞机环控系统进行了优化计算验证。分析结果对飞机环境控制系统的优化设计具有一定指导作用。

An entropy generation analysis method based on the second law of thermodynamics was used in component level optimization design of aircraft environmental control system.Under given design condition,the function relationship between system entropy generation and given initial conditions is obtained through analyzing the air flow process in environmental control system.Along with the heat exchanger design computing process,the effect of the ratio relations among the heat exchanger hot side flow length,cold side flow length and height on whole system entropy generation is obtained.The proposed method was used to validate the optimization calculation on a certain aircraft environmental control system.Analysis results have certain guidance function to aircraft environmental control system optimal design.