联合收割机排气余热回收用热管换热器结构参数优化  

Optimizing the structure parameters of heat pipe exchanger for exhaust heat recovery of combine harvester

作　　者：王明杰 陈平录[1,2] 许静 刘木华[1,2] Wang Mingjie;Chen Pinglu;Xu Jing;Liu Muhua(College of Engineering,Jiangxi Agricultural University,Nanchang,330045,China;Jiangxi Key Laboratory of Modern Agricultural Equipment,Nanchang,330045,China)

机构地区：[1]江西农业大学工学院,南昌市330045 [2]江西省现代农业装备重点实验室,南昌市330045

出　　处：《中国农机化学报》2020年第7期164-170,共7页Journal of Chinese Agricultural Mechanization

基　　金：国家自然科学基金(31560344)。

摘　　要：为提升联合收割机燃油总能转换效率,设计一种基于气-气式热管换热器的联合收割机尾气余热回收谷物干燥系统,建立以换热器换热量最高和排气系统背压增量最小为目标的优化设计模型,运用带精英策略的无支配排序遗传算法程序(NSGA-II)对热管换热器的无缝钢管选型、翅片厚度以及翅片间距则进行多目标优化,获取该换热器的最优结构参数组合,并采用数值模拟方法对优化前后的换热性能进行对比验证。结果表明,经过优化后的热管换热器在系统整体压力降相差不大的情况下,遗传算法优化结果换热器总换热量提升约1.5%,仿真试验也表明换热量提升1%。In order to improve total energy conversion efficiency of combine harvester,a grain drying system of combine harvester’s exhaust waste heat recovery based on heat pipe heat exchanger was designed and its optimization model was established to maximize the heat transfer capacity of heat exchanger and minimize the back pressure increment of exhaust system.The elitist non-dominant sort genetic algorithm(NSGA-II)was used for the multi-objective optimization to the selection of seamless steel pipe,the thickness of the tube wall,the thickness of the fin and the spacing of the fin,and then the optimum structure parameters of heat pipe was acquired.In addition,the optimized result was verified by numerical simulation comparative analysis.The results showed that the heat transfer quantity of the optimized heat pipe heat exchanger was increased by 1.5%of NSGA-II and 1%of simulation experiment separately compared with the empirical design while the pressure drop of the whole system is not much different.

关 键 词：热管 余热回收 联合收割机 遗传算法 

分 类 号：S218[农业科学—农业机械化工程]