Influences of Ultra-High Exhaust Gas Recirculation on Performance and Emission Characteristics of a Dimethyl Ether Engine

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Influences of Ultra-High Exhaust Gas Recirculation on Performance and Emission Characteristics of a Dimethyl Ether Engine

更新时间：2025-07-09

- Influences of Ultra-High Exhaust Gas Recirculation on Performance and Emission Characteristics of a Dimethyl Ether Engine
- Vol. 43, Issue 11, Pages: 27-31(2009)
- 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：
  CLC： TK464
- Online First：10 November 2009，
  
  Published：2009
- 稿件说明：
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Influences of Ultra-High Exhaust Gas Recirculation on Performance and Emission Characteristics of a Dimethyl Ether Engine[J]. 2009, 43(11): 27-31.
DOI：

Influences of Ultra-High Exhaust Gas Recirculation on Performance and Emission Characteristics of a Dimethyl Ether Engine[J]. 2009, 43(11): 27-31. DOI：

摘要

在一台两缸二甲醚发动机上开展了不同废气再循环(EGR)率下发动机的性能和排放特性研究

测量了不同工况下发动机的油耗

HC、CO和NO

的排放.研究表明:二甲醚发动机可承受的最大EGR率接近60%

但在高负荷时

过大的EGR率会导致发动机燃油消耗率显著升高; EGR率对发动机的NO

排放量影响很大

随着EGR率的增加

发动机的NO

排放量大幅度下降

高负荷时下降幅度更大; EGR率增大

HC和CO排放增加

高负荷时增加的幅度更大

特别是当EGR率超过一定范围时

EGR率的增大会引起HC和CO排放的急剧增加; 低负荷时

最佳EGR率应保持在30%左右

而高负荷时

应采用较小的EGR率.

Abstract

To study the influences of the exhaust gas recirculation(EGR)rate on the emissions and performance of dimethyl ether(DME)engines

an experimental investigation was conducted on a 2-cylinder DME engine with EGR. Under the various operating conditions

the fuel consumption and emissions of HC

and NO

were measured. The results show that the maximum EGR rate of the DME engine can reach 60% approximately

however

under high load conditions

too large EGR rate will result in obvious deterioration in the engine brake specific fuel consumption. EGR has significant effects on NO

emissions. NO

emissions decrease clearly with the increase in the EGR rate

especially under high load conditions. HC and CO emissions increase with the increase in the EGR rate

particularly under high load

conditions. When the EGR rate is over a certain value

the increase of the EGR rate will lead to a quick increase in HC and CO emissions. It is suggested that the optimal EGR rate should be near 30% under low load conditions while the engine should run with low EGR rates under high load conditions.

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Keywords

references

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