轻量化单缸直喷式柴油机喷油器与燃烧系统匹配研究动力机械及工程专业论文.docxVIP

安装深度较小时，容易使燃油蒸汽依附在气缸盖顶部，不利于燃烧。在油 安装深度较小时，容易使燃油蒸汽依附在气缸盖顶部，不利于燃烧。在油 束夹角，以及喷油嘴安装深度不变时，使燃烧室整体偏移活塞中心5mm， 喷油器还是安装在燃烧室正上方。仿真结果显示，在2600r／min，满负荷时， 偏置燃烧室的柴油机雾化出现雾化不均匀一，缸内气流运动较燃烧室不偏置 的柴油机有了较大变化。试验结果表明：在高速、高负荷的工况下，不偏 置型的燃烧室较偏置燃烧室型油耗要低很多。 关键字：高速单缸柴油机模拟仿真雾化 缸内气流 偏置燃烧室 万方数据 CHARACTERISⅡCS CHARACTERISⅡCS STUDY 0IN UGHIr-ⅧGHT S玳(讧尼CⅥ加ER DⅡi匝CT玳Ⅱ℃ⅡON DmSEL ENGD厄玳CⅥ，D蛆)ER FLOW After the industrial revolution，human beings consumed non-renewable energy in the past one hundred years，resulting in a shortage of energy and environmental degradation and other issues．Diesel engine is a link to promote the progress of human civilization，SO developing a more economical and environmentally-friendly diesel engine with a strong momentum has a great prospect．For the direct inj ection diesel engine，airflow in the cylinder and the formation of gas mixture play a crucial role to the combustion and pollutant emissions．Although the electronic control technology can provide the best fuel injection quanlity according the working conditions of the engine．And the inj ection pressure is not affected by the engine speed．However，as the hard work environment and high maintenance cost and other factors，the small single cylinder non-road agricultural diesel engines is improved by the improvement of the air flow in the cylinder and the quality of the fuel mixture in order to improve the power and economy of diesel． Due to the lightweight design of the GD 1 90 single cylinder diesel engine， the cylinder head is very small．It is convenient to design the cylinder head Ill 万方数据 through through estimating the basic parameters of design．In this paper，we estimate the size of the inj ector nozzle at the first．The calculation model of inj ector and combustion chamber was established by ESE modular of AVL Fire．Then we establish the full model to analyse the influence of nozzle angle，nozzle depth and combusition chamber bias on combustion． The results show that the short stroke of high-speed single cylinder diesel engine