Study of the Impact on the Spray Shape Stability and the Combustion Process of Supply Pressure Fluctuations in CR-Diesel Injectors
Study of the Impact on the Spray Shape Stability and the Combustion Process of Supply Pressure Fluctuations in CR-Diesel Injectors
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DOI：
10.4271/2004-01-0023
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
M. Pontoppidan;F. Ausiello;G. Bella;S. Ubertini
中科院分区：
文献类型：
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作者：
M. Pontoppidan;F. Ausiello;G. Bella;S. Ubertini
本文研究了供油压力波动对喷油器雾化器上游侧的影响。该研究是在宽范围的压力（70至130 Mpa）与两个不同的共轨（CR）高压喷油器。常见的雾化器是配备有圆锥形雾化器孔的VCO型。将喷油嘴（喷嘴）安装在反压容器中，同时记录燃油轨和喷油器体中的压力波动，并采用频闪纹影可视化技术对时间分辨喷雾特性进行观察。它表明，不仅瞬时质量流量的影响。作为轨压、脉宽和喷射策略的函数，压力波动改变喷雾的核心结构及其破碎行为。为了量化对燃烧过程的影响，在压力容器中的喷雾行为可视化完成与空间和时间的喷雾行为的分析考虑，通过使用3D数值模拟代码NCF-3D。不同喷射器的预测燃烧数据与1.3升涡轮增压轿车柴油发动机的测量数据相关。
The paper presents a study of the influence of fuel pressure supply fluctuations on the upstream side of the fuel injector atomizer. The study is performed over a wide range of pressures (70 to 130 Mpa) with two different common-rail (CR) high-pressure fuel injectors. The common atomizer is a VCO-type equipped with conically shaped atomizer bores. With the injector tip (nozzle) mounted in a counterpressure vessel the pressure fluctuations in the fuel-rail and in the injector body are recorded simultaneously with stroboscopic Schlieren-visualization of the time-resolved spray behavior. It is demonstrated that not only the instantaneous mass flow is affected. As a function of rail-pressure, pulse-width and injection strategy the pressure fluctuations change the spray hard-core structure and its break-up behavior. In order to quantify the impact on the combustion process the spray behavior visualizations in the pressure vessel are completed with analytical considerations of the spatial and temporal spray behavior obtained by the use of the 3D-numerical simulation code NCF-3D. The predicted combustion data for the different injectors are correlated to measured data from a 1.3-liter turbocharged passenger car diesel engine.