【摘要】 本文从高压油管内一元不稳定流动方程出发,通过简化的燃油压力公式以及高压油路中附加容积内压力的变化公式,并结合当前柴油机燃油系统的实际情况和发展动向,着重阐述了高压喷射的实施途径有:增加油泵凸轮的速度和增大柱塞直径;减少高压油管的长度和内径;尽量减少高压油路中的附加容积以及截面的变化;提高喷嘴针阀的开启压力等。文中还论述了由于高压喷射所带来的二次喷射,穴蚀,针阀反跳,燃气倒流,不稳定喷射以及低速失控等问题和消除这些问题所采取的相应措施。更多还原

【Abstract】 Based on combination of simplified formulae for the calculation of fuel Pressure and pressure variation in the additional volume of a high pressure fuel duct and the one dimension equations for unstable flow,under the consideration of the actual case and developing trend of recent fuel system, the present paper underlines the approach of high pressure injection; the earn speed and plunger diameter of fuel injection pump should be increased; the length and inner diameter of high pressure fuel tube decreased; additional volume and crosssection variation in duct reduced as much as possible; and nozzle needle open pressure raised; etc. The problems on second injection, cavity corrosion, nozzle needle bound, reverse flow of gas, and unstale and uncontrolled injection at low spead, and relevant measures for obviating those problems are also mentioned.更多还原