汽车尾气废热回收的热电模块布置特性研究

由于按照模块单元来实现热电材料回收废热具备优势,在试验校核的基础上建立了热- 电-结构的有限元分析模型用于热电模块在汽车排气管上布置特性的研究。首先热通量模拟结果显示排气管壁面与热电模块接触处存在大热斑,根据大热斑的轮廓得到本文研究的热电模块之间的最佳布置间隙为6. 6 mm。然后根据最大输出功率原则精确计算了热电模块的内阻值,内阻的获得为模块矩阵的结构优化提供了参考依据。最后利用模型对热电模块的薄弱结构进行热应力校核,校核结果为热电模块的可靠布置提供了参考依据。

Study of Module Configuration Characteristics about Exhaust Gas Thermoelectric Recycling in Vehicle

Modular units of thermoelectric material have many advantages in waste heat recovery. A ther- mal-electric-structural FEM model is established to analyze the configuration characteristics of thermoelec- tric modules around the exhaust pipe on the base of experiment validation. Firstly, the heat flux plots show that there is a big hot streak on the wall of the exhaust gas pipe in contact with the thermoelectric module,the optimal arrangement gap of 6. 6mm between the thermoelectric modules can be determined from the contour of the big hot streak. Secondly, the internal resistance of thermoelectric module can be precisely obtained according to the principle of the maximum output power, and the internal resistance value can provide a basis for the optimization of the module matrix. Finally, the FEM model can be used to check the heat stress of the weak structure of the thermoelectric module, and the check result can pro- vide the basis for reliable arrangement of thermoelectric modules.