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Numerical study on the effect of the injection pressure on spray penetration length

机译：喷射压力对喷雾渗透长度影响的数值研究

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This paper investigates the fuel spray behavior and variation of the spray characteristics under different injection pressures in internal combustion engines. In diesel engines the fuel spray is affected by the cavitation phenomenon which occurs in the injector orifice. The cavitation is one of the important phenomena which has a significant effect on the fuel spray characteristics. In this paper, for a specified geometry of the nozzle and the combustion chamber, the effect of the cavitation phenomenon on the spray characteristics, i.e. spray penetration length, the Sauter main diameter and evaporation are studied numerically for different values of the injection pressures. High injection pressure causes high velocity of the fuel in the injector orifice which leads to an effective atomization process with small and dispersed fuel droplets. The fluid flow equations are calculated in the combustion chamber to obtain the spray model. Since it is known that, high injection pressure together with low discharge pressure leads to creation of cavitation phenomenon inside the injector orifice, then for having cavitation phenomenon inside the injector orifice and consequently for investigating the cavitation phenomenon effects on the spray characteristics, the injection pressure values of 10-150 MPa are considered while the discharge pressure remains constant. The injector and combustion chamber are simulated in separated regions and the results of the outlet of the nozzle are used as the boundary conditions for solving the fuel flow inside the combustion chamber to achieve the spray simulation. The results of this study show that by increasing the injection pressure, the value of the spray penetration length increases and the Sauter main diameter decreases for constant discharge pressure. The Hydraulic Flip phenomenon occurs after the injection pressure of 120 MPa on the base of the results of this work.
机译：本文研究了内燃机在不同喷射压力下的燃油喷雾行为和喷雾特性的变化。在柴油发动机中，喷油嘴会受到喷油嘴中发生的气蚀现象的影响。空化是对燃料喷雾特性具有重要影响的重要现象之一。在本文中，对于喷嘴和燃烧室的特定几何形状，对于不同的喷射压力值，通过数值研究了气穴现象对喷雾特性的影响，即喷雾渗透长度，索特（Sauter）主直径和蒸发量。较高的喷射压力会导致喷射器孔中的燃料高速旋转，从而导致有效的雾化过程，并使燃料液滴分散小。在燃烧室中计算流体流动方程以获得喷雾模型。由于已知的是，高喷射压力与低排出压力一起导致在喷射器孔内产生气穴现象，然后由于在喷射器孔内具有气穴现象，因此用于研究气穴现象对喷雾特性，喷射压力的影响。当排出压力保持恒定时，可考虑10-150 MPa的最大压力值。在分开的区域中对喷油器和燃烧室进行了模拟，喷嘴的出口结果被用作解决燃烧室内部燃料流动以实现喷雾模拟的边界条件。这项研究的结果表明，对于恒定的排放压力，通过增加注入压力，喷雾穿透长度的值会增加，而Sauter的主直径会减小。根据这项工作的结果，在注入压力为120 MPa之后会出现“液压翻转”现象。

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