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首页> 外文期刊>International Journal of Multiphase Flow >Experimental and numerical analysis of high pressure diesel spray-wall interaction
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Experimental and numerical analysis of high pressure diesel spray-wall interaction

机译：高压柴油机喷壁相互作用的实验与数值分析

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The interaction between impacting and splashed droplets and air motion plays a fundamental role on the mixture formation process, which is a crucial aspect for the correct operation of modern DI Diesel engines as it greatly influences the combustion process and the exhaust emissions. A complete understanding of spray impingement is quite complex. A mixed numerical-experimental approach is proposed in this paper. The experimental tests are carried out with a high pressure (up to 120 MPa) diesel spray emerging from an axial disposed single-hole nozzle in an optically accessible vessel, pressurized up to 5.0 MPa at ambient temperature. The jet impacts on a flat stainless steel wall heated up to 500 degrees C by a 200 W temperature regulated electrical resistance wire. The experimental analysis is performed using a Bosh tube as the injection mass flow meter, a pulsed laser sheet generated on the second harmonic of a Nd-YAG laser and a synchronized CCD camera. Digital image post-processing allows extraction of the radial penetration and thickness growth of the impacted fuel versus injection pressure, vessel back-pressure and wall temperature. Moreover, a procedure to relate light intensity to average fuel density is proposed. The numerical analysis is carried out by means of a multi-dimensional numerical tool, based on the KIVA-3V code. The spray wall interaction is simulated through a phenomenological splash model available in literature and validated for low injection pressures (up to 300 bar) and ambient back-pressure. The comparison between experimental and numerical results demonstrates the inability of the model in predicting high pressure spray-wall interaction, especially under increasing back-pressures. Based on the experimental evidences, a modified version of the model is proposed and the new model is proven to be an adequate representation for different injection pressures and back-pressures. (c) 2007 Elsevier Ltd. All rights reserved.
机译：撞击液滴和飞溅液滴之间的相互作用以及空气运动在混合物形成过程中起着根本性的作用，这对现代DI柴油机的正确运行至关重要，因为它会极大地影响燃烧过程和废气排放。对喷雾冲击的完整理解非常复杂。本文提出了一种混合数值实验方法。实验测试是通过在可光学访问的容器中从轴向布置的单孔喷嘴中喷出的高压柴油（最高120 MPa）进行的，在环境温度下加压至5.0 MPa。射流撞击到由200 W调温电阻丝加热到500摄氏度的扁平不锈钢壁上。使用Bosh管作为注入质量流量计，在Nd-YAG激光器的二次谐波上生成的脉冲激光片和同步CCD相机进行实验分析。数字图像后处理允许提取受影响的燃料相对于喷射压力，容器背压和壁温的径向渗透和厚度增长。此外，提出了将光强度与平均燃料密度相关联的过程。借助KIVA-3V代码，借助多维数值工具进行数值分析。喷壁相互作用是通过文献中可用的现象学飞溅模型进行模拟的，并针对低注入压力（最高300 bar）和环境背压进行了验证。实验结果与数值结果之间的比较表明，该模型无法预测高压喷壁相互作用，尤其是在背压增加的情况下。根据实验证据，提出了模型的修改版本，新模型被证明可以很好地代表不同的注射压力和背压。 （c）2007 Elsevier Ltd.保留所有权利。

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