【作者】 袁晓红；

【导师】 黄妙华；

【作者基本信息】 武汉理工大学 ， 车辆工程， 2012， 博士

【摘要】 内燃机作为汽车的传统动力源,热效率始终偏低,其中由尾气带走的热量高达40%左右,温差发电是一项新兴的尾气余热能量回收利用技术。本文围绕汽车发动机尾气余热温差发电装置开展相关研究工作,在温差发电装置热端仿真及温度场研究、热电性能仿真、热应力分析、模态分析及结构优化方面有以下创新点：(1)研发了一种汽车发动机尾气余热温差发电装置。对该温差发电装置热端气箱进行流固共轭换热数值仿真,并提出一种评价平板式温差发电装置表面温度均匀性的指标--温度均匀性系数。利用此评价指标,评价热端气箱温度场的均匀性,作为温差发电模块拓扑结构设计的理论依据。解决了由于温差发电装置结构设计与温差发电模块拓扑结构设计之间不匹配,带来的温差发电效率不高的问题。(2)以仿真软件GT-POWER和Matlab为平台,建立温差发电装置热端气箱一维等效模型及其与发动机的集成模型、冷端水箱一维等效模型及其与发动机冷却系统的集成模型、发电性能计算模型及其与整车的集成模型的基础,并通过仿真分析较好地解决了由于冷端气箱接入对发动机动力性、经济性带来的影响。(3)建立温差发电装置热端试验平台,设计并进行了热端试验,结合试验数据对热端气箱表面温度均匀性系数和平均温度进行验证,仿真与试验结果一致,表明了热端气箱数值仿真的正确性。(4)采用有限元软件系统分析了温差发电装置整体、热端气箱和冷端水箱的热应力及模态情况。针对在温差发电装置中出现的变形、振动、噪声过大等问题,利用计算仿真结果,进行结构改进。一定程度上解决了装置在工作过程中的变形、振动、噪声过大等问题。保证了模块与装置之间良好的接触,提高了温差发电转换效率。更多还原

【Abstract】 Combustion engine as the car the traditional sources of power, thermal efficiency is always low, up to about40%of the heat taken away by the exhaust thermal energy is a potential exhaust heat energy recovery and utilization technologies.This paper focuses on the automotive engine exhaust waste heat thermoelectric power generation devices to carry out related work, the thermoelectric performance thermoelectric power generation device simulation of the hot end and the temperature field simulation, thermal stress analysis, model analysis and structural optimization of the formation of the following results:(1)A thermoelectric power generation is development. On the basis of numerical simulation of fluid-solid conjugate heat transfer on the hot side gas tank of the thermoelectric power generation device, an evaluation of flat-plate thermal energy device surface temperature uniformity index-temperature uniformity coefficient is proposed. With this evaluation target, the uniformity of the gas tank on the hot end temperature field can provide a theoretical basis for topological structure of the thermoelectric modular. The unmatch of the thermoelectric power generation and topological structure of the thermoelectric modular can be solved, the efficiency of the thermoelectric power generation is improved too.(2)With the simulation software of GT-Power and Matlab, in the establishment of an integrated model of the one-dimensional equivalent model of the gas tank of the hot side of thermoelectric power generation device and the engine, the model of one-dimensional equivalent of the cold-side water tank and the engine cooling system and an integrated model, computational model of the power generation performance and vehicle on the basis of the integrated model. And the influence on dynamics and economics of the engine that brought by the introduction of the cold-side water tank is well solved.(3)Finite element software systems analysis of thermal stress and the mode of thermoelectric power generation device as a whole, the hot end of the air box and cold side tanks. Aiming at the large deformation, vibration and noise, the structure improvement is done with the result of the simulation. In some extent, the problem of the deformation, vibration and noise is solved. And with the good contact of the modular of the generation, the efficiency of the thermoelectric power generation is improved.(4)Establishment of the hot end of the test platform of the thermoelectric power generation device, and the hot end of the trial design, combined with experimental data for verification, simulation and test results on the uniformity coefficient and the average temperature of the surface temperature of the hot end of the gas tank, indicating that the numerical simulation of the hot gas box correctness.更多还原