Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (4): 954-963.doi: 10.13229/j.cnki.jdxbgxb.20210813

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Effects of methanol substitution percent on combustion and emission of diesel engines under plateau condition

Jian WANG1(),Wei YU1,Bin WANG2   

  1. 1.School of Automotive and Traffic Engineering，Jiangsu University，Zhenjiang 212000，China
    2.Wuxi Diesel Engine Factory，FAW Jiefang Automobile Co. ，Ltd. ，Wuxi 214026，China
  • Received:2021-08-22 Online:2023-04-01 Published:2023-04-20

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Abstract:

The altitude pressure of 10 m， 700 m and 2400 m were simulated to explore the combustion and emission of diesel-methanol dual fuel engine in different altitude. The test conditions were 25%， 50% and 75% load at 1800 r/min. The results demonstrated that under 25% load， misfire emerge in the cylinder at 40% methanol substitution percentage （MSP） and 2400 m， which lead to the peak pressure decrease in the cylinder， the combustion delay period will be prolonged， and the diffusion combustion will be shortened. Under 50% and 75% loads， the increasing of altitude and MSP result in peak pressure increasing in the cylinder. The combustion duration decreases with the increasing of MSP and increases with the increasing of altitude in all conditions. Compared with the pure diesel mode in 10 m， under different altitudes and MSP， the maximum ignition delay period of the engine is extended by 27.01% and the minimum is shortened by 28.99%. The maximum combustion duration is shortened by 43.20% and extended by 22.79%， the CA50 moves forward by 8.55% ~ 21.82%， and the in-cylinder combustion temperature rises by 1.45% ~ 23.83%. The brake thermal efficiency of the engine decreases with the increase of altitude and increases with the increase of MSP at 50% and 75% loads. However， brake thermal efficiency presents a more complex variation rule under 25% load. Among the pollutant emission， with the increase of MSP， NO x and Soot decreased simultaneously， HC and CO increased simultaneously under the same load. With the increase of altitude， the emission almost all showed an upward trend. The research can provide reference for the in-cylinder combustion and emission of diesel/methanol dual fuel engine in the plateau area.

Key words: power mechanical engineering, diesel/methanol dual fuel, altitude, combustion, emissions

CLC Number: 

  • TK428.9

Table 1

Main specifications of engine"

项目参数
型式直列四缸，四冲程，增压中冷
缸径×行程/（mm×mm）95×115
压缩比18.5
排量/L3.26
额定功率/kW75（2400 r·min-1）
最大转矩/（N?m）320（1800 r·min-1）

Table 2

Range and accuracy of parameters"

测量参数范围精度
转速/（r?min-1）0~6000±1
扭矩/（N·m）0~400±0.05（F.S.）
缸内压力/MPa0~25±0.05%（F.S.）
柴油耗/（kg?h-1）0~40±0. 4%（F.S.）
甲醇耗/（kg?h-1）0~40±0. 4%（F.S.）
排气温度/℃0~800±1
进排气压力/kPa0~40±0.5%（F.S.）

Table 3

Test scheme and conditions"

转速/（r·min-1）扭矩/（N·m） （负荷率/%）海拔高度/m大气压力/kPa甲醇替代率/%
180079 （25）10100.30/10/20/30/40/50
70093.20/10/20/30/40/50
240075.60/10/20/30/40
158 （50）10100.30/10/20/30/40/50
70093.20/10/20/30/40/50
240075.60/10/20/30/40
237 （75）10100.30/10/20/30/40
70093.20/10/20/30/40
240075.60/10/20/30

Fig.1

Effects of different altitudes and MSP on in-cylinder pressure"

Fig.2

Effects of different altitude and MSP on ignition delay， combustion duration and CA50"

Fig.3

Effect of different altitude and MSP on average combustion temperature in cylinder"

Fig.4

Effect of different altitude and MSP on brake thermal efficiency"

Fig.5

Effect of different altitude and MSP on NO x emission"

Fig.6

Effect of different altitude and MSP onsoot emission"

Fig.7

Effect of different altitude and MSP on COemission"

Fig.8

Effect of different altitude and MSP on HCemission"

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