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首页> 外文期刊>Fuel >Numerical investigation on the hydrodynamics of the internal flow and spray behavior of diesel fuel in a conical nozzle orifice with the spiral rifling like guides
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Numerical investigation on the hydrodynamics of the internal flow and spray behavior of diesel fuel in a conical nozzle orifice with the spiral rifling like guides

机译：螺旋膛线状导流管在锥形喷嘴孔内柴油内部流动和喷雾行为的流体动力学数值研究

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Hydrodynamic characteristics of fuel sprays have significant effect on the pollutant emissions of internal combustion engines. Fuel spray penetration length and spray cone angle are two important criteria in spray quality assessment. Injector geometry has undeniable impact on spray behavior. In this study at first two different cylindrical and conical shape of nozzle hole have been considered from mini-sac kind and their internal liquid flow and the behavior of their resulted sprays have been investigated numerically via AVL-Fire CFD code. Numerical results of the first part of this study show, although using conical nozzles leads to longer spray penetration length, but a decrease in spray cone angle is detected. Furthermore, the results show that Sauter-mean diameter of these two nozzles are almost the same. In the next step in an attempt for having a liquid spray with a much larger cone angle, a conical nozzle with a spiral rifling like guide is proposed and the liquid flow in its inside and the resulted spray behavior are investigated numerically. The numerical results of the second part of this study show that the liquid spray resulted from the new proposed nozzle have surprisingly large cone angle about two fold more than the cone angle of sprays of two previous cases. In addition numerical results show that in the case of the new proposed nozzle the resulted liquid spray and its droplets have vortical motion. Although in the case of the new proposed nozzle, the penetration length of the liquid spray is shorter than two previous cases, having much larger spray cone angle convinces us that the new proposed nozzle could lead to better mixing of air and fuel droplets and consequently could lead to less pollutant emissions. Most importantly, the penetration length and cone angle of the spray and its vortical motion can be controlled by the geometrical parameters of the new proposed Nozzle. (C) 2017 Elsevier Ltd. All rights reserved.
机译：燃油喷雾的水动力特性对内燃机的污染物排放有重要影响。燃油喷雾穿透长度和喷雾锥角是评估喷雾质量的两个重要标准。喷油嘴的几何形状对喷涂性能具有不可否认的影响。在本研究中，首先从微型囊中考虑了两种不同的圆柱孔和圆锥形喷嘴孔，并通过AVL-Fire CFD代码对它们的内部液体流动和产生的喷雾行为进行了数值研究。这项研究的第一部分的数值结果表明，尽管使用锥形喷嘴会导致更长的喷雾穿透长度，但是可以检测到喷雾锥角的减小。此外，结果表明，这两个喷嘴的索特平均直径几乎相同。在接下来的尝试以更大的锥角进行液体喷雾的步骤中，提出了一种具有螺旋状膛线状的圆锥形喷嘴作为导向装置，并对其内部的液体流动和产生的喷雾行为进行了数值研究。这项研究的第二部分的数值结果表明，新提出的喷嘴产生的液体喷雾具有惊人的大锥角，比前两种情况的喷雾锥角大两倍。另外，数值结果表明，在新提出的喷嘴的情况下，所产生的液体喷雾及其液滴具有涡旋运动。尽管在新提议的喷嘴的情况下，液体喷雾的穿透长度比前两种情况短，但具有更大的喷雾锥角使我们确信，新提议的喷嘴可以导致空气和燃料液滴的更好混合，因此可以导致更少的污染物排放。最重要的是，喷雾的穿透长度和锥角及其涡旋运动可以通过新提出的喷嘴的几何参数来控制。 （C）2017 Elsevier Ltd.保留所有权利。

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