Measurements and analyses on the two-phase fuel transient flow characteristics of dual fuel co-direct injector

IF 2.2 4区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Engine Research Pub Date : 2023-12-15 DOI:10.1177/14680874231212691

Daijun Wei, Canze Ju, Xiyu Yang, Tanqing Zhou, Xiaoyan Wang, Quan Dong

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Abstract

In this research, an innovative two-phase fuel transient flow coefficient measurement system is proposed to investigate the flow characteristics and coupling effects of two-phase fuel, and to fill the gap of the two-phase fuel flow characteristics measurement technology of dual fuel injector. For this purpose, microphotography technology is used to obtain the original image of the injector hole, and the accurate area of the injector hole can be obtained by image processing. The two-phase injection momentum and the transient injection pressure are measured by the impact force sensor and the pressure sensor respectively, and the two-phase fuel transient flow coefficient is obtained. Due to the change of the increasing rate of the effective flow area at the nozzle, the gas transient flow coefficient shows two different increasing trends during the upward stage of the gas needle valve. With the background pressure increase, the maximum gas transient flow coefficient decreases and injection duration increases. The influence of pilot diesel injection on subsequent gas injection stages is mainly reflected in that when the gas energizing time is 0.8 ms, the fluctuation range of gas mass flow caused by diesel injection is 52.6%, and the fluctuation range is 14.9% when the gas energizing time is 2 ms, but the influence of diesel injection on the peak value of gas transient flow coefficient can be ignored.

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双燃料联合直接喷射器两相燃料瞬态流动特性的测量与分析

本研究提出了一种创新的两相燃料瞬态流量系数测量系统，用于研究两相燃料的流动特性和耦合效应，填补了双燃料喷射器两相燃料流动特性测量技术的空白。为此，采用显微照相技术获取喷油器孔的原始图像，并通过图像处理获得喷油器孔的精确面积。通过冲击力传感器和压力传感器分别测量两相喷射动量和瞬时喷射压力，得到两相燃料瞬时流量系数。由于喷嘴处有效流通面积增加率的变化，气体瞬态流量系数在气体针阀上升阶段呈现出两种不同的增加趋势。随着背景压力的增加，最大气体瞬态流量系数减小，喷射持续时间增加。先导柴油喷射对后续气体喷射阶段的影响主要体现在，当气体通气时间为 0.8 ms 时，柴油喷射引起的气体质量流量波动范围为 52.6%，当气体通气时间为 2 ms 时，波动范围为 14.9%，但可以忽略柴油喷射对气体瞬态流量系数峰值的影响。

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