汽车温差发电系统的多物理场建模与对比
Multiphysics modelling and comparison of thermoelectric generator system of automobile
罗丁 1张浩慷 1杨学林 1汪若尘2
作者信息
- 1. 三峡大学电气与新能源学院,湖北宜昌 443000
- 2. 江苏大学汽车与交通工程学院,江苏镇江 212013
- 折叠
摘要
为了获取实际行驶工况下汽车温差发电系统的瞬态响应特性,提出瞬态流-热-电多物理场耦合模型、混合瞬态CFD-TE数值模型和混合瞬态CFD-分析模型 3 种瞬态理论模型;以瞬态工况下的尾气温度和质量流量作为边界条件,使用COMSOL软件完成模型的瞬态仿真求解,并对比分析不同模型预测的输出响应特性;搭建系统瞬态试验台架,验证模型的准确性.结果表明:输出功率的响应特性与尾气温度的变化有关,且显示出较大的热惯性,而转换效率的响应特性主要与尾气质量流量的变化有关;瞬态流-热-电多物理场耦合模型、混合瞬态CFD-TE和CFD-分析模型与试验结果之间的输出电压平均误差分别为 7.99%、25.96%和 21.05%.
Abstract
To obtain the dynamic response characteristics of the automobile̍s thermoelectric generator system under transient driving cycles,three transient theoretical models were proposed,including the transient fluid-thermal-electric multiphysics coupling model,the hybrid transient CFD-TE and CFD-analytical models.Taking the exhaust temperature and mass flow rate under the transient driving cycle as boundary conditions,the models were computed via the COMSOL software,and the out-put response characteristics predicted by different models were analyzed and compared in detail.The model was verified by developing the transient experimental setup on the system.The results show that,the response characteristics in the output power is mainly related to the change of exhaust temperature,and there is a large thermal inertia,while the response charac-teristic in the conversion efficiency is mainly determined by the exhaust mass flow rate.On average,the differences between predicted output voltage and experimental results are respectively 7.99%,25.96%and 21.05%for the transient fluid-ther-mal-electric multiphysics coupling model,the hybrid transient CFD-TE and the CFD-analytical models.
关键词
温差发电/瞬态行驶工况/多物理场/数值模型/动态响应Key words
thermoelectric generator/transient driving cycle/multiphysics/numerical model/dynamic response引用本文复制引用
基金项目
国家自然科学基金项目(52072217)
国家自然科学基金项目(22179071)
出版年
2024
国家科技期刊平台
NSTL
万方数据