发动机尾气余热温差发电系统的优化

Optimization of Thermoelectric Generation System with Engine Exhaust Gas

为测量和改进温差发电装置的性能,建立了试验台架进行测试。通过台架试验及计算流体动力学软件分析,确定了温差发电装置内部流场的优化方向。利用ANSYS Fluent软件对不同肋片数目和肋片高度、不同肋片前后端高度、不同装置端口长度等诸多方案进行仿真计算,以热端表面平均温度和流场均匀性为依据,确定了相对较优的方案。根据所选方案进行装置改进和台架试验,在测试工况范围内相比原始方案,冷热端平均温差提高了8.8%,系统输出功率提高了5.8%。

A test-bed for thermoelectric generator （TEG） was established to measure and improve the performance of a TEG. Through the experiment and corresponding analysis of computational fluid dynamics （CFD）, three different optimizing directions for the fluid field in the TEG were determined. The effects of these three directions：different numbers and heights of fin, different front- and rear-end heights of fin as well as different port lengths on the fluid field which eventually affects the performance of the TEG were analyzed using the ANSYS Fluent program. Finally a relatively optimal plan for the TEG was made on the basis of the hot-end mean temperature and the uniformity of temperature distribution. The TEG was then modified and tested. The test result shows cold and hot ends is increased that under the testing conditions, the mean temperature difference between the by 8.8% and the electric power output by 5.8%.