摘要
飞机综合环控/热管理系统迫切需要建立快捷高效的换热器动态仿真模型,以满足先进控制系统设计需求。基于此,针对板翅式换热器动态模型,提出一种包含2个延迟环节和4个一阶惯性环节的传递函数矩阵形式,并从换热器机理模型出发,利用拉普拉斯变换推导模型中4个时间常数的计算公式,提出基于换热器效率的传热热阻计算关系式的辨识方法,解决了主要模型参数设置难题。以板翅式换热器为研究对象,在Simulink仿真平台搭建其传递函数动态模型,并与AMESim仿真平台搭建的机理模型进行对比分析,结果显示:2种模型所得空气和冷却水出口温度分别随入口温度和质量流量阶跃变化的动态响应曲线吻合很好,其中,4种工况空气和冷却水出口温度最大稳态偏差分别为0.034℃和0.029℃,当冷却水入口质量流量阶跃变化时,空气出口温度动态响应相对偏差最大,为9.27%,当空气入口质量流量阶跃变化时,冷却水出口温度动态响应相对偏差最大,为7.03%。
A fast and efficient dynamic simulation model of heat exchangers is urgently needed to meet the requirements of the advanced control system design for the integrated environmental control and thermal management system of aircraft.In this paper,a dynamic model by transfer function matrix,composed of two delay links and four first-order inertia links,is proposed for plate-fin heat exchangers.The identification method for the calculation formulas of thermal resistance based on the efficiency of the heat exchanger is given,which solves the issue of setting two key parameters in the model.The calculation formulas of four-time constants in the simplified model are derived according to the mechanism of the heat exchanger by using the Laplace transform.Taking an air-liquid plate-fin heat exchanger as the research object,the new dynamic simulation model is built in Simulink software,and compared with the mechanism model built in AMESim software.The results show that both models have similar dynamic responses of the outlet temperature at both flow sides with step change of inlet temperature or flow rate.Under four working conditions,the highest steady-state variations of the air and cooling water outlet temperatures are 0.034℃and 0.029℃,respectively.The maximum dynamic relative deviation of airflow outlet temperature is 9.27%with a step change of the cooling water flow rate.The maximum dynamic relative deviation of cooling water flow outlet temperature is 7.03%with a step change of the airflow rate.
作者
梁兴壮
黄志远
艾凤明
袁振伟
汪箭
LIANG Xingzhuang;HUANG Zhiyuan;AI Fengming;YUAN Zhenwei;WANG Jian(State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,China;AVIC Shenyang Aircraft Design and Research Institute,Shenyang 110035,China)
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2024年第1期154-162,共9页
Journal of Beijing University of Aeronautics and Astronautics
关键词
换热器
动态模型
传递函数矩阵
时间常数
传热热阻
heat exchanger
dynamic model
transfer function matrix
time constant
thermal resistance
