Developmental Research of Ultra High Pressure Fuel Injections System by Electro-Hydraurical Control

对超高压喷射喷雾的喷雾特性进行了评价，并在试验柴油机上进行了燃烧特性和排放测试。在本研究中对以下项目进行了评估。>柴油喷雾的雾化>高压高温下柴油喷雾中汽液浓度的同时测量>喷雾与燃烧室壁面的碰撞特性>高压喷射喷雾的初始过程>多级喷射柴油机的燃烧特性和排放>多级喷射的喷雾特性>间歇式燃气射流中的环境气体夹带>高压喷射柴油机的排气排放>燃烧室中柴油火焰的燃烧特性>凸轮与滚子齿带之间的润滑油厚度通过本研究获得的结果表明高压喷射对喷雾特性的影响，燃烧特性和废气排放定量。此外，研究结果还为超高压喷射系统在真实的柴油机上的应用提供了参考。

Spray characteristics of the ultra high-pressure injection spray were evaluated, and also diesel combustion characteristics and exhaust emissions were measured when the high-pressure njection system was applied to an experimental diesel engine. The following items were evaluated in this study.> Atomization of diesel spray> Simultanious concentration measurements of vapor and liquid in a diesel spray injected into high pressure and high temperature atomosphere> Characteristics of sprays impinging onto a combustion chamber wall> Initial process of the high-pressure injection spray> Combustion characteristics and exhaust emissions of multi-stage injection diesel engine> Spray characteristics of multi-stage injection> Ambient gas entrainment into intermittent gas jets> Exhaust emissions of high-pressure injection diesel engine> Flame behavior of diesel flame in a combustion chamber> Thickness of lubrication oil between cam and rollertapetThe results obtained by this research demonstrates effects of the high-pressure injection on spray characteristics, combustion characteristics and exhaust emissions quantitatively. Moreover, the results suggest how to apply the ultra high-pressure injection system to real diesel engines.