冷却系统能量回收温差发电器设计方法研究

摘要

为实现发动机冷却系统能量回收的回收利用,提出了基于数值计算对冷却系统能量回收温差发电器进行设计的方法,并利用发动机台架实验对该方法的可行性进行了验证.研究发现数值计算得到的散热系统温度和台架试验结果的偏差在3.5％以内,能量回收管阻力偏差为1.5％,这表明利用数值计算的方法对能量回收管和散热系统进行分析设计是可行的.进一步的实验表明,采用市售温差发电片对发动机冷却系统能量回收有一定的可行性,但是采用目前的结构形式使得温差发电器两端温差较小,导致其能量回收的经济性较差.%In order to achieve energy recovery and utilization of an engine's cooling system and improve its internal combustion engine efficiency,we develop an optimization design method for the energy recovery of the thermoelectric generator of the internal combustion engine's cooling system by using the numerical method,the finite volume method and a three-dimensional model.Its validation is done by experiments.The results on the cooling system temperature distribution show that the difference between the simulation and experimental results is less than 3.5％,while the residential pressure difference of energy recovery pipe is 1.5％.This indicates that the simulation method for cooling system and the energy recovery pipe analysis based on numerical simulation are feasible.More experimental results indicate that it is feasible to recover and recycle the energy from the internal combustion engine's cooling system based on commercial thermoelectric chips but the thermoelectric generator is not economical because the current generator has only a small temperature difference between its hot and cold ends.