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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Liquid film thickness inside the high pressure swirl injectors: Real scale measurement and evaluation of analytical equations
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Liquid film thickness inside the high pressure swirl injectors: Real scale measurement and evaluation of analytical equations

机译：高压旋流喷射器内的液膜厚度：实际测量和分析方程式的评估

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摘要

Liquid film thickness inside two swirl injectors for direct injection (DI) gasoline engines was measured at different injection pressure conditions ranging from 2.0 to 7.0 MPa and then previous analytical and empirical equations were examined from the experimental results. Based on the evaluation, a new equation for the liquid film thickness inside the swirl injectors was introduced. A direct photography using two real scale transparent nozzles and a pulsed light source was employed to measure the liquid film thickness inside the swirl injectors. The error in the liquid film thickness measurement, generated from different refractive indices among transparent nozzle, fuel and air, was estimated and corrected based on the geometric optics. Two injectors which have different nozzle diameter and nozzle length were applied to introduce a more general empirical equation for the liquid film thickness inside the pressure swirl injectors. The results showed that the liquid film thickness remains constant at the injection pressures for direct injection gasoline engines while the ratio of nozzle length to nozzle diameter (L/D) shows significant effect on the liquid film thickness. The previously introduced analytical and empirical equations for relatively low injection pressure swirl injectors overestimated the effect of injection pressure at the operating range of high pressure swirl injectors and, in addition, the effect of L/D ratio and swirler geometry was rarely considered. A new empirical equation was suggested based on the experimental results by taking into account the effects of fuel properties, nozzle diameter, nozzle length and swirler geometry.
机译：在2.0至7.0 MPa的不同喷射压力条件下，测量了两个用于直喷（DI）汽油发动机的旋流喷射器内的液膜厚度，然后根据实验结果检查了先前的分析和经验公式。在评估的基础上，引入了旋流喷油器内部液膜厚度的新方程。使用两个真实比例的透明喷嘴和脉冲光源的直接摄影被用于测量旋流注射器内部的液膜厚度。基于几何光学，估算并校正了由透明喷嘴，燃料和空气之间的不同折射率所产生的液膜厚度测量误差。使用两个具有不同喷嘴直径和喷嘴长度的喷油器，为压力旋流喷油器内的液膜厚度引入更一般的经验公式。结果表明，对于直喷汽油发动机，液膜厚度在喷射压力下保持恒定，而喷嘴长度与喷嘴直径的比（L / D）对液膜厚度具有显着影响。先前介绍的相对较低的喷射压力旋流喷射器的分析和经验公式高估了在高压旋流喷射器的工作范围内喷射压力的影响，此外，很少考虑L / D比和旋流器几何形状的影响。考虑到燃料特性，喷嘴直径，喷嘴长度和旋流器几何形状的影响，根据实验结果提出了一个新的经验方程。

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