【作者】 杨忠勇；

【导师】 胡真； 杨庆佛；

【作者基本信息】 太原理工大学 ， 动力机械及工程， 2004， 硕士

【摘要】 人类对能源的需求与利用能源而造成环境污染之间的矛盾一直困绕着世界各国。由于世界石油资源日趋减少，同时为解决发动机的排放问题，在内燃机领域中对清洁代用燃料的研究己成为前沿课题。随着我国经济的迅速发展和汽车保有量的高速增长，正面临汽车能源需求与环境保护的双重巨大压力。 二甲醚(Dimethyl Ether，DME)燃料是国际上近年来新出现的很有发展前途的超低排污代用燃料。二甲醚作为一种燃烧洁净的燃料，近年来受到了研究者的关注。研究表明，DME的十六烷值高，非常适合作为柴油机的代用燃料，而且它能实现洁净燃烧，有望满足未来严格的柴油机排放法规。在柴油机上燃用二甲醚，从长远来看，可以解决石油资源减少的问题，从近期考虑，则能够改善排气污染，它为解决能源危机和环境污染两大难题开辟了一条现实可行的道路。 本文在对国内外现有对新型清洁代用燃料二甲醚理论和应用研究广泛了结的基础上，针对二甲醚在传统柴油机上应用中存在的一个制约实用化的问题——二甲醚粘度极低易导致高压油泵柱塞偶件早期磨损——提出了一套新型的高压油泵强制润滑系统。该系统对原高压油太原理工大学硕士研究生学位论文泵柱塞偶件结构进行了改进和优化后，在柱塞偶件中引入一定压力的润滑油，以改善二甲醚发动机工作过程中高压油泵柱塞偶件的早期磨损和泄漏。 文中详细介绍了高压油泵强制润滑系统的结构设计和工作原理，以及模拟高压油泵试验台架的设计和实验结果。依据工作原理，在纯二甲醚、D80和柴油三种燃料条件下，对不同的柱塞偶件进行了时间对比测试试验;模拟高压油泵试验台架的作用是模拟高压油泵在发动机上的工作状况，可进行长时间的连续试验，以取得准确的实验数据。 通过对试验现象和试验数据的综合分析和合理评价，本文提出的二甲醚发动机高压油泵强制润滑系统可有效的改善柱塞偶件的磨损，进而起到阻止二甲醚在工作过程中通过柱塞偶件的过量泄漏。从而为目前我国在柴油机汽车燃用二甲醚过程中，燃油供给系统的技术改造，提供科学的依据和参考。更多还原

【Abstract】 It worries the whole world at the time that the limitless requirement of energy is in conflict with environmental pollution resulting from utilizing endlessly energy sources by human. In order to deal with the problem about energy crisis and the emissions of engine, the research based on the alternative fuels in the internal combustion engine field has become the foreland task. It is confronting with the dual pressure from both the automotive requirement of energy and environmental protection along with the rapid national economic development and the high-speed increase in cars.Dimethyl Ether (DME) is the most promising ultra-low-emission alternative fuel discovered recently in the world. As a kind of cleanly burning fuel, DME is catchingmany researchers’ attentions in recent year. It is showed by research that its cetane value is so high that DME is perfectly suitable to be alternative fuel of diesel engine, and it is hopeful meeting the future stringent emission regulation of diesel engine because of its clean combustion. Burning DME in the diesel engine can solve the problem that petroleum resources is reducing based on the long-term viewpoint, meanwhile, it can meliorate the emission pollution based on the short-terns viewpoint, which develop a realistically feasible approach tosolve tow big difficult problems, namely crisis of energy andenvironmental pollution.Based on the theory and application study of the new clear alternative fuels-DME, this paper presents a new forcible lubrication system of high pressure oil pump against that viscosity of DME is so low that plunger of high pressure oil pump abrade early, which is a problem confining DME’ application in the conventional diesel engine. This system improves and optimizes the construction of the plunger of the high pressure oil pump. Having some definitive pressure’ lubrication is applied in the plunger to solving abrasion and leakage while the plunger piston use in the DME engine.In this paper, the construction design and working principle of forcible lubrication system of high pressure oil pump areintroduced as well as the design of simulator stand and the experimental results. Using three fuels such as pure DME, D80and diesel, we do experiments to different plunger pistons at the time ratio according to the working principle. The rule of the simulator stand is to simulate working condition of the high pressure oil pump in the engine, so we can long test continually and get exact and proper test dates.Through the comprehensive analysis and proper evaluation on the experiment phenomena and test dates, this paper draws a conclusion that the forcible lubrication system of high pressure oil pump in the DME engine can improve the abrasion of plunger and decrease DME excessive leakage in the working process, and that provides scientific basis and reference to the technology modification of the fuel delivery system in the diesel-engine vehicle burning DME.更多还原