【作者】 乔国辉；

【导师】 徐宇工；

【作者基本信息】 北京交通大学 ， 环境工程， 2007， 硕士

【摘要】 车辆推进系统不断向高紧凑、高性能、高可靠性的方向发展。随着发动机转速和功率密度不断提高,热负荷也越来越大,对发动机冷却系统和润滑系统的要求也越来越高。发动机散热系统技术是其辅助系统的核心技术之一,是高紧凑性推进系统的重要组成部分,因此,寻求尺寸小、效率高的换热设备成为研制新一代发动机过程中的重点和难点之一。采用高效换热元件或高温冷却技术是解决此问题的两个有效途径。考虑到热管和热管散热技术的特点及其广泛的应用,针对高强化柴油机冷却系统中的典型换热元件采用热管散热技术不失为一种有意义的探索。本文根据传热学理论,通过对热管换热器设计计算方法的归纳与总结,运用VB语言编制了热管式换热器的通用设计计算程序,实现了热管换热器的程序化设计。为了使软件具有更强的实用性、可操作性,以及便于进行二次开发,作者将该程序与Excel和AutoCAD软件连接起来,使该程序可以利用Excel和AutoCAD软件方便的生成Excel计算报表和AutoCAD工程图。本文利用所设计的热管换热器设计计算程序,设计了一台热管式热交换器,并对其进行了台架性能试验。用三组试验数据对程序进行了修正,用另外四组试验数据验证了修正程序准确性。结果证明了所开发程序的可靠性和实用性。最后,作为论文研究成果的实际应用,作者根据高强化柴油机对冷却系统的要求,对某型号柴油机的机油冷却器采用热管换热器进行了设计计算,并分析了影响热管换热器性能的一些因素,最终确定了满足要求的热管式机油冷却器的结构尺寸。更多还原

【Abstract】 The development direction of propulsion system in vehicles is high-compact, high-performance, and high-reliability. The engine heat load is increasing with the increasing of engine speed and power density, this requires the cooling systems and the lubrication systems having high performance. Vehicles cooling technology is one of the core technologies of auxiliary system in the engines. So, searching for small size, high efficiency heat transfer equipment has become the key but difficult process of developing a new generation of engines.Using the efficient component or high temperature cooling system are two valid ways to resolve this problem. Owe to the extensive application of heat-pipe and its characteristics, it may well be a meaningful exploration using the heat-pipe cooling technology for the heat-exchanger components in diesel engine cooling systems.Based on the heat transfer theory, the calculation methods of heat-pipe heat-exchanger were summarized in this paper. According to the common calculation method of heat-pipe heat-exchanger, the common procedure for heat-pipe heat-exchanger was compiled using VB language. In order to make the procedure more practical, more feasible and more easily for secondary development, this calculation procedure is linked with the Excel and AutoCAD. Using this procedure, you can get the Excel statements and AutoCAD graphics conveniently.In this paper, a heat-pipe heat-exchanger was designed using the calculation program, and bench performance tests were carried out. The calculation procedure was amended by using 3 groups test data and the accuary of the amended procedure was verified by using other 4 groups test data. The results proved that the procedure is reliable and practical.Finally, as the practical application of the research results, a heat-pipe oil-cooler was designed according to the request of the cooling system in highly intensified diesel engines. In addition, the author analyzed the factors influencing the performance of heat-pipe oil-cooler and the structure size of the heat-pipe oil-cooler was settled after repeated calculations.更多还原