圆管瞬态换热的附加热容处理方法及热容影响分析
Additional Heat Capacity Treatment Method and Heat Capacity Impact Analysis for Transient Heat Transfer of Circular Tube
林远方 1杨世宇 1徐向华 1梁新刚1
作者信息
- 1. 清华大学航天航空学院热科学与动力工程教育部重点实验室,北京 100084
- 折叠
摘要
管道的附加部件导致难以使用一维模型准确描述管内流体的瞬态流动换热,本文提出将其等效为温度不同于管道的部件,按照集总参数法处理附加部件与管道的换热.本文进行温度阶跃和余弦变化工况下圆管的瞬态换热特性实验研究,并采用附加热容法仿真计算出口温度响应,结果表明:附加热容法能够显著提升计算精度,各工况下仿真结果与实验数据的平均相对误差均不超过2％.同时,本文定义平均迟滞时间量化固体热容对流体温度变化的影响.
Abstract
The additional components of the tube make it difficult to accurately describe the tran-sient flow and heat transfer of the internal fluid using a one-dimensional model.Therefore,this paper proposes to equate them to components with different temperatures than the tube,and treat the heat transfer between the additional components and the tube using the lumped parameter method.This paper conducts experimental research on the transient heat transfer characteristics of circular tube under temperature step and cosine change conditions,and calculates the outlet tem-perature response using the additional heat capacity method.The results show that the additional heat capacity method can significantly improve the calculation accuracy,and the average relative error between the simulation results and experimental data under various conditions does not exceed 2％.Meanwhile,this paper defines the average hysteresis time to quantify the impact of solid heat capacity on fluid temperature changes.
关键词
阶跃响应/余弦响应/附加热容法/平均迟滞时间/非线性拟合Key words
step response/cosine response/additional heat capacity method/average hysteresis time/nonlinear fitting引用本文复制引用
基金项目
国家科技重大专项(2019-Ⅲ-0001-0044)
出版年
2024
NETL
NSTL
维普
万方数据