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首页> 外文期刊>Fuel >Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 1 - Hydraulic performance
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Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 1 - Hydraulic performance

机译：多孔柴油喷嘴中孔口倾角影响的实验研究。第1部分-液压性能

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Highlights•Influence of nozzle included angle on hydraulic performance is assessed.•Main differences are seen into the steady-state phase of the injection event.•Higher included angle leads to higher pressure losses and lower injection velocity.•Correlation of discharge coefficient as a function of included angle is obtained.AbstractNozzle hydraulic performance has a significant impact on diesel spray development and combustion characteristics. Thus, it is important to understand the links between the nozzle geometry, the internal flow features and the spray formation. In this paper, a detailed analysis of the impact of the nozzle orifices inclination angle on its hydraulic performance is performed. For this purpose, three different nozzles with included angles of 90, 140 and 155 degrees are evaluated. Instantaneous injection rate and momentum flux are measured on a set of injector operating conditions (mainly injection pressure and discharge pressure). The results show that higher inclination angles lead to smaller mass flow and momentum flux at steady-state conditions, due to the higher losses at the orifice inlet. These losses are translated in lower both area and velocity coefficients. Nevertheless, the impact of this parameter is limited thanks to the counter-acting effect of the hydrogrinding process, which produces larger rounding radii at the orifice inlet as the included angle increases. Based on the experimental results, correlations of the discharge coefficient as a function of the Reynolds number are obtained and evaluated.
机译： 突出显示 • 评估喷嘴夹角对水力性能的影响。 • 在注射液的稳态阶段可以看到主要区别事件。 • 更高的夹角会导致更高的压力损失和更低的注射速度。 •• 放电系数与inc的函数关系 摘要 喷嘴的液压性能对柴油机喷雾的产生和燃烧特性有重大影响。因此，重要的是要了解喷嘴几何形状，内部流动特征和喷雾形成之间的联系。在本文中，对喷嘴孔口倾斜角对其液压性能的影响进行了详细分析。为此，评估了三个不同的喷嘴，它们具有90、140和155度的夹角。瞬时喷射速率和动量通量是在一组喷射器运行条件（主要是喷射压力和排放压力）下测量的。结果表明，由于节流孔入口处的损耗较高，因此较大的倾斜角会导致稳态条件下的质量流量和动量通量较小。这些损失转化为较低的面积系数和速度系数。然而，由于水力研磨过程的反作用效应，该参数的影响受到限制，当夹角增加时，该作用会在孔口入口处产生更大的倒圆半径。根据实验结果，获得并评估了放电系数与雷诺数的关系。

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