基于三维至一维联合仿真的增程器废气温差发电机结构优化

Structure Optimization of Exhaust Gas Thermoelectric Generator of Range Extender Based on 3D to 1D Co-Simulation

为有效预估温差发电机的性能并进行结构优化,针对特定的热电模块建立了一维传热模型,针对不同的温差发电机结构建立了三维流场与传热模型,并将2种模型进行耦合以实现对输出功率的直接显示。利用上述模型对4种不同温差发电机结构进行了对比分析,结果表明,在废气温度与流量分别为523K、0.02kg/s的条件下,换热器的翅片错位且翅片间距10mm、张角8°时的输出功率最高,为133W,相较于换热器翅片整齐排列且无张角的结构,其净输出功率提高了约14%。

In this research,a one-dimensional heat transfer model was built for a specific thermoelectric module to better estimate property of thermoelectric generator and optimize structure.The three-dimensional flow field and heat transfer models were also established for different thermoelectric generator structures,those two models were coupled to realize the direct display of power output of thermoelectric generator.Based on the coupled models,thermoelectric generators with four different structures were compared and analyzed.The results show that,under the conditions of exhaust gas temperature 523 K and flow rate 0.02 kg/s,the maximum net power output of the heat exchanger structure with staggered fins and a fin spacing of 10 mm and an angle of 8°is 133 W,which is about 14%higher than that of the basic control group with neatly arranged fins and no angle of opening.