GDI发动机中不同燃料射流特性的试验研究

doi:10.19562/j.chinasae.qcgc.2023.01.010

Abstract

Abstract:

Flash-boiling spray in gasoline direct injection （GDI） engines has the advantage of promoting mixing of oil and gas， but the phenomenon of spray collapse is detrimental to combustion and emission， and studies have found that spray collapse is closely related to single-jet behavior. Therefore， in order to mitigate spray collapse and take full advantage of flash boiling jets in GDI engines， it is extremely important to understand the behavior of flash boiling jet. In this paper， a single-hole fuel injector modified from a five-hole fuel injector is selected， and n-hexane and isooctane fuel are selected to conduct experimental research in a constant volume combustion bomb. The selected fuel temperature is 30 to 130 ℃ and the ambient pressure is 0.2 to 1 bar. By analyzing the relationship between the jet width and different parameters such as superheat degree， nucleation rate， chemical potential and environmental ambient pressure， it is found that the correlation between the jet width and $? ? μ · p a m b - 0.5$ is more than 0.9， which has a good correlation， indicating that the jet width near the nozzle is affected by the phase change potential and the environmental ambient pressure.

Key words: GDI spray, flash boiling, jet morphology, chemical potential

Guodong Liu,Guizhou Ren,Zijie Zhao,Jingyu Zhang,Yanfei Li. An Experimental Study on Characteristics of Different Fuel Jets in GDI Engine[J].Automotive Engineering, 2023, 45(1): 86-92.

Figures/Tables 12

References 27

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参数	数值
喷射燃料	正己烷、异辛烷
喷射压力/MPa	10
喷射脉宽/ms	2.0
环境温度/℃	室温
环境背压/bar	0.2、0.4、0.6、0.8、1
燃油温度/℃	30、50、70、90、110、130

An Experimental Study on Characteristics of Different Fuel Jets in GDI Engine

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References 27

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