超临界CO2印刷电路板式换热器动态特性研究

Study on Dynamic Characteristics of Supercritical CO2 Printed Circuit Heat Exchanger

中文关键词: 超临界二氧化碳  PCHE  动态特性  延迟效应

英文关键词: Supercritical carbon dioxide  PCHE  Dynamic characteristics  Delay effect

中文摘要:

      印刷电路板式换热器（PCHE）动态特性的研究作为超临界CO2布雷顿循环发电系统动态研究的重要组成部分。本文采用样件性能试验与建模仿真相结合的方法，以实测数据为基础拟合形成PCHE热工水力特性方程和范宁摩擦系数关联式，并通过能量守恒微分方程建立一维动态模型，与实验数据对比验证了模型的有效性；分别设定PCHE冷/热进口参数近似斜坡和正弦变化激励，重点分析了模拟船用布雷顿循环变工况运行和船体平台摇摆条件下的换热过程动态特性。研究结果表明，在斜坡激励响应中，传热温差调控速度越快，则出口温度响应也越快，但是不同调控速度下出口温度达到稳态所需时间基本相同；在正弦激励响应中，进口参数正弦波动的周期越短，则冷热侧出口温度振幅越低，且响应滞后时间与进口激励周期时间呈负相关。

英文摘要:

      The research of the dynamic characteristics of the printed circuit board heat exchanger (PCHE) is an important part of the dynamic research of the Supercritical CO2 Brayton cycle power generation system. In this paper, the method of combining sample performance test and modeling simulation is used to fit and form the PCHE thermal-hydraulic characteristic equation and fanning friction coefficient correlation equation based on the measured data, and establish a one-dimensional dynamic model through the energy conservation differential equation. Data comparison verifies the effectiveness of related simulation model. The research results show that the adjustment speed of heat transferring temperature difference has a positive correlation with the outlet temperature response under the condition of slope excitation, but the time required for the outlet temperature to reach the steady state is basically the same when the adjustment speed is not available. Under the condition of sinusoidal excitation, a shorter period of the sinusoidal fluctuation excitation in the inlet parameters will lead a lower outlet temperature amplitude respond at the hot and cold side, and the response lag time is negatively correlated with the inlet excitation cycle time.