汽车温差发电系统的多物理场建模与对比OA北大核心CSTPCD

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.