柴油机喷雾碰壁引燃进气预热特性研究

doi:10.19562/j.chinasae.qcgc.2023.08.019

Abstract

Abstract:

For the cold start of heavy-duty diesel engine in low temperature environment， an intake preheating scheme using spray ignition by hot wall impinging combined with flame stabilization by recirculation is proposed. Based on the self-designed and built preheating experiment apparatus， the temperature rising and combustion characteristics under different inflow speed， fuel spray targeting and injection strategy are studied， and CFD numerical simulations are conducted. The experimental results show that ignition and temperature rise are strongly sensitive to spray targeting， and there is an optimal position of heating plate， with the mean temperature rising rate reaching 4.24 ℃/s at the inflow speed of 10 m/s. To balance the temperature rising rate， combustion efficiency and maintenance cost， the injection strategy with an injection period of 20~25 ms and injection pulse width of 1~3 ms should be adopted at high inflow speed. The fast droplets rebound and break up after impinging the heating plate， which falls in the Leidenfrost breakup mode. The simulation results show that a recirculation region with local flow speed of lower than 5 m/s is formed by the spoiler， which promotes evaporation and fuel-air mixing， and it is conducive to ignition and flame stabilization. For appropriate match between the injection mass with injection frequency， it is essentially to make the combustion duration suitable with injection period， so as to make full use of fuel and increase temperature rise and heat release rate.

Key words: diesel engine, intake preheating, spray wall impinging ignition, flame stabilization by recirculation, numerical simulation

Yixiao Zhang,Xiao Ma,Xinhui Lu,Zhi Wang,Weilin Zhuge,Shijin Shuai. An Investigation on Intake Preheating Characteristics Based on Spray Wall Impinging Ignition for Diesel Engine[J].Automotive Engineering, 2023, 45(8): 1489-1498.

Figures/Tables 13

References 38

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参数	范围
环境压力/MPa	0.1
环境温度/K	300
燃油温度/K	293
加热板位置/mm	0，±5，±10
风机频率/Hz （平均风速/（m·s^-1））	15（3）， 50（10）
喷射周期/ms （喷射频率/Hz）	10（100）， 20（50）， 25（40）， 50（20）
喷射脉宽/ms	1，2，3，…，9
喷射压力/MPa	0.5

模型		描述
喷雾子模型	喷雾破碎	K-H & R-T模型
	喷雾-壁面相互作用	Wall film模型
	湍流弥散	O’Rourke模型
	液滴蒸发	Frossling模型
	液滴碰撞	NTC collision模型
	液滴阻力	Dynamic drop drag模型
湍流子模型		RNG k-ε 模型
燃烧子模型	燃料	柴油（物性）正庚烷（组分）
	燃烧模型	MZ-SAGE模型
	反应机理	Liu等^［33］（48组分，152反应）

参数	Case 1	Case 2	Case 3
环境压力/MPa	0.1
环境温度/K	243
燃油温度/K	293
来流速度/（m·s^-1）	10
加热板位置/mm	0
喷射压力/MPa	0.5
喷射周期/ms	20	20	40
喷射脉宽/ms	1	3	3

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An Investigation on Intake Preheating Characteristics Based on Spray Wall Impinging Ignition for Diesel Engine

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