预喷策略耦合EGR对DN双燃料发动机工作过程的影响

doi:10.19562/j.chinasae.qcgc.2021.08.004

Abstract

Abstract:

The influence of different pilot?injection strategies coupled with EGR on the combustion and emission characteristics of diesel/natural gas （DN） dual fuel engine are studied based on the three?dimensional fluid dynamics software. The results show that when the pilot diesel injection ratio （FDIR） is fixed and the pilot diesel injection timing （FDIT） is advanced beyond -10（°）CA ATDC， the burning center of gravity （CA 50） is closer to the top dead center. It is beneficial to reduce CH₄， HC， CO and Soot emissions. But the NO_x emission is higher than that of single injection and reaches the peak when the FDIT is advanced to -20（°）CA ATDC. When FDIT is advanced to -10（°）CA ATDC， the increase of FDIR has little influence on emission. When FDIT is advanced beyond -10（°）CA ATDC， larger FDIR can keep CH₄， HC， CO and Soot emissions at a low level. As the EGR rate increases， the emissions of CH₄， HC， CO， and Soot of different pilot?injection strategies are generally increased. When the EGR rate reaches 15%， the FDIT is advanced to -20（°）CA ATDC， and the FDIR is 30%， the emission value of each gas is generally lower than that of the single injection. When the EGR rate reaches 25%， the NO_x emission of different pilot?injection strategies is reduced to the lowest level while the CO and Soot emissions exceed that of the single injection.

Key words: diesel, natural gas, pilot?injection strategy, EGR, emission characteristics

Guisheng Chen,Feng Wei,Renxin Xiao,Jingxian Zhang,Zhenjiang Zhang Han Wang. Influence of Pilot Injection Strategy Coupled with EGR on the Working Process of DN Dual Fuel Engine[J].Automotive Engineering, 2021, 43(8): 1143-1151.

Figures/Tables 19

References 18

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参数	性能指标
型式	直列、四冲程
缸径×行程/mm	123×145
排量/L	10.338
连杆长度/mm	224
压缩比	17.5
喷油器喷孔数	8
进气门关闭时刻/（°）CA ATDC	-156
排气门开启时刻/（°）CA ATDC	144

参数	性能指标
湍流建模方式	RANS
湍流模型	RNG k?ε
喷雾破碎模型	KH?RT
撞壁模型	Wall film
油滴蒸发模型	Frossling
燃烧模型	SAGE

参数	数值
	工况1	工况2	工况3
转速/（r·min^-1）	1 720	1 420	1 420
转矩/（N·m）	370	1 215	405
单缸循环油量/（mg·cycle^-1）	24.48	138.22	18.86
单缸循环气量/（mg·cycle^-1）	42.64	0.00	37.95
喷油压力/MPa	120	120	160
热值折算替代率/%	66.9	0.0	70
EGR率/%	1.23	0.7	19.19

参数	数值
喷油压力/MPa	120
主喷定时/（o）CA ATDC	-3
预喷定时/（o）CA ATDC	-10、-20、-30
预喷射量/%	10、20、30

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Influence of Pilot Injection Strategy Coupled with EGR on the Working Process of DN Dual Fuel Engine

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