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Effects of nozzle hole size and rail pressure on diesel spray and mixture characteristics under similar injection rate profile – experimental, computational and analytical studies under non-evaporating spray condition
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ( IF 1.5 ) Pub Date : 2021-06-02 , DOI: 10.1177/09544070211022099
Safiullah 1 , Keiya Nishida 1 , Youichi Ogata 1 , Tetsuya Oda 2 , Katsuyuki Ohsawa 2
Affiliation  

In the present work, effects of nozzle hole size and rail pressure under non-evaporating spray condition are demonstrated. Three single hole injectors with the bore size of 0.101, 0.122, and 0.133 mm are experimented with injection pressures of 140, 45, and 38 MPa respectively to achieve similar injection rate profile. Diesel spray experiments implement Diffused Backlight Illumination Technique where diffused background is obtained for the High Speed Video camera imaging. Experimental results are then validated with computational and analytical studies. The CFD simulation requires the injection rate profile and spray cone angle as a primary input; thus, based on the High Speed Video Camera start of injection frame the 5 kHz Butterworth low-pass frequency filter is applied to the injection rate raw data. While, the spray cone angle is predicted using a simple model obtained from the relationship between the injection velocity, fluctuating velocity at the nozzle exit and total pressure loss factor of the injector. The experimental spray tip penetration of all three injectors is almost identical as the similar injection rate profile is adopted. Although, the mixture characteristics are better for 0.101 mm hole diameter since the smaller hole diameter with highest injection pressure depicts larger spray angle and better atomization. The computational study agrees with experiments qualitatively; however, the quantitative and qualitative agreements are seen in the analytical study.



中文翻译:

在相似喷射率曲线下喷嘴孔尺寸和轨压对柴油喷射和混合特性的影响——非蒸发喷射条件下的实验、计算和分析研究

在目前的工作中,演示了在非蒸发喷雾条件下喷嘴孔尺寸和轨道压力的影响。三个孔径分别为 0.101、0.122 和 0.133 mm 的单孔喷射器分别在 140、45 和 38 MPa 的注射压力下进行试验,以实现相似的注射率分布。柴油喷雾实验采用漫射背光照明技术,其中为高速摄像机成像获得漫射背景。然后通过计算和分析研究验证实验结果。CFD 模拟需要将喷射率曲线和喷雾锥角作为主要输入;因此,基于注入帧的高速摄像机开始,将 5 kHz 巴特沃斯低通频率滤波器应用于注入率原始数据。尽管,喷射锥角使用一个简单的模型来预测,该模型从喷射速度、喷嘴出口处的波动速度和喷射器的总压力损失因子之间的关系中获得。由于采用了相似的喷射速率曲线,因此所有三个喷射器的实验喷嘴渗透率几乎相同。虽然,0.101 毫米孔径的混合特性更好,因为较小的孔径和最高的注射压力描绘了更大的喷雾角度和更好的雾化。计算研究与实验定性一致;然而,在分析研究中可以看到定量和定性的一致性。由于采用了相似的喷射速率曲线,因此所有三个喷射器的实验喷嘴渗透率几乎相同。虽然,0.101 毫米孔径的混合特性更好,因为较小的孔径和最高的注射压力描绘了更大的喷雾角度和更好的雾化。计算研究与实验定性一致;然而,在分析研究中可以看到定量和定性的一致性。由于采用了相似的喷射速率曲线,因此所有三个喷射器的实验喷嘴渗透率几乎相同。虽然,0.101 毫米孔径的混合特性更好,因为较小的孔径和最高的注射压力描绘了更大的喷雾角度和更好的雾化。计算研究与实验定性一致;然而,在分析研究中可以看到定量和定性的一致性。

更新日期:2021-06-02
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