Combustion and Emission Characteristics of Premixed Charge Compression Ignition Engine

doi:10.7652/xjtuxb201407005

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Combustion and Emission Characteristics of Premixed Charge Compression Ignition Engine

更新时间：2025-07-09

- Combustion and Emission Characteristics of Premixed Charge Compression Ignition Engine
- Vol. 48, Issue 7, Pages: 23-28(2014)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201407005
  CLC： TK464
- Online First：10 July 2014，
  
  Published：2014
- 稿件说明：
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Combustion and Emission Characteristics of Premixed Charge Compression Ignition Engine[J]. 2014, 48(7): 23-28.
DOI：

Combustion and Emission Characteristics of Premixed Charge Compression Ignition Engine[J]. 2014, 48(7): 23-28. DOI： 10.7652/xjtuxb201407005.

摘要

为改善柴油机的燃烧和排放特性

在一台2105柴油机上开展了二甲醚(DME)预混比和废气再循环(EGR)对二甲醚-柴油双燃料预混均质充量压缩燃烧(PCCI)发动机的燃烧与排放特性影响的试验研究

通过在进气道预混DME和缸内直喷柴油实现了PCCI燃烧模式。试验结果表明:随着DME预混比的增加

放热过程由两阶段放热发展到三阶段放热

燃烧始点前移

最高爆发压力逐渐增大且对应的相位不断提前; 冷EGR导致的PCCI发动机最高爆发压力下降的程度、瞬时放热率峰值及压力升高率峰值对应的相位滞后程度均随着DME预混比的增加逐渐减弱; 随着DME预混比的增大和EGR率的减小

当量有效燃油消耗率逐渐降低

有效热效率逐渐升高; DME预混比和EGR率增大可有效降低NO

排放

但是HC和CO排放有所增加。文中工况下最优DME预混比为30%。

Abstract

To improve the combustion and emission of a diesel engine

the effects of dimethyl ether(DME)pre-mixing ratio and cold exhaust gas recirculation(EGR)on combustion and emission characteristics of DME-diesel dual fuel PCCI(premixed charge compression ignition)engine were experimentally investigated on a 2105 diesel engine. DME was inducted to the intake air and diesel was injected directly into the cylinder to realize PCCI combustion mode. The results show that with increasing DME pre-mixing ratio

the heat release process is divided into three stages instead of two stages and combustion is advanced; the peak values of in-cylinder pressure increase and the corresponding phases are advanced; the decreasing level of the maximum in-cylinder

pressure and the degree of phase latency corresponding to the maximum instantaneous heat release rate and the maximum pressure rise rate decline gradually with increasing DME pre-mixing ratio; the equivalent fuel consumption rate reduces and effective thermal efficiency increases with increasing pre-mixing ratio and decreasing EGR rate; NO

emission effectively decreases with increasing pre-mixing ratio and EGR rate

while HC and CO emissions increase. The optimum DME pre-mixing ratio is suggested as 30%.

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references

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