毕业论文-6135柴油机空冷器的设计.doc

摘 要 柴油机气缸中的空气密度不仅决定于增压空气压力，而且还与进入气缸的气温有关。新鲜空气在涡轮增压器中虽提高了压力，但气温也伴随着空气压缩而上升，气体热胀的结果抵销了气压升高的一部分效果。 实践表明：如使进入气缸前的增压空气冷却，则柴油机增压的效果会更好。例如，进入气缸的增压空气每降温10°C，约可使柴油机功率提高2.5～3％，油耗降低2～3克／马力小时,排气温度降低，柴油机受热机件酌热状态得到改善．涡轮叶片也可在接受的排气温度下工作，这使得柴油机的工作可靠性和经济性有所提高。因此，在增压器压气机蜗壳出口到进入柴油机气缸之间的空气通道上有必要设置增压空气中间冷却器(简称中冷器)。 课题主要任务就是在6135柴油机的废气涡轮增压系统中如何设计配置中间空气冷却器，从而使其在任何工况下都能获得比较理想的工作状态，并寻求在拖拉机上配用废气涡轮增压柴油机的增压中冷器设计成果。 关键词：柴油机；空冷器；涡轮增加 Abstract  Cylinder diesel engine in the air density is determined not only boost air pressure, but also with the temperature into the cylinder. Fresh air in while in the turbocharger increases pressure, compressed air is accompanied by temperature rise, the result of thermal expansion of gas more than offset the higher part of the pressure effect. Practice shows that: if so pressurized air into the cylinder before the cooling, the supercharged diesel engine with better results. For example, pressurized air into the cylinder every cool 10 ° C, about diesel power could increase 2.5 to 3%, fuel consumption decreased 2 to 3 g / hp-hr, lower exhaust temperature, engine heat to heat the discretion of the state to improve parts. Turbine blades can also be accepted to work under the exhaust temperature, which makes the engine work has increased the reliability and economy. Therefore, scroll turbocharger compressor cylinder diesel exports to enter the air channel between the need to set the pressurized air intercooler (the intercooler).  The main task is to issue emission 6135 diesel turbo system, how to design configure the middle of the air cooler, so that it can be in any condition more satisfactory working conditions, and seek the tractor is equipped with exhaust gas turbocharger Turbocharged diesel engine design results. Key words: diesel engine; air cooler; turbine to increase  目 录 第一章 引言 1 1.1 本课题的意义及现阶段发展的趋势 1 1.2 课题的提出和主要任务 3 1.3 增压中冷器的主要性能参数 4 第二章 增压中冷器的概述 5 2.1 中冷器的冷却方式及结构 5 2.1.2 中冷器的冷却方式 5 2．1．2 中冷器的结构 6 2．2 板翅式热交换器的构造和工作原理 7 2．3 增压中冷器采用