Effects of methanol and water injection in intake air on combustion and emission of diesel engine

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jul.2023, Vol.46 No.7: 893-899

DOI: 10.3969/j.issn.1003-5060.2023.07.005

Authors

LIU Yongqiang $ ^{1} $, GENG Honggang $ ^{1} $, XU Changchun $ ^{2} $, ZHUANG Yuan $ ^{1} $

(1. School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Department of Mechanical and Automotive Engineering, Kongju National University, Cheonan 31080, South Korea)

Abstract and Keywords

Abstract: The effects of intake air mixed with methanol aqueous solution (methanol volume fraction of 0%, 30%, 60%, 90% and 100% respectively) on engine combustion and emission performance were studied on Yunnei D30 diesel engine. The results show that when methanol aqueous solution is injected into the intake air of the diesel engine, the combustion characteristic parameters such as the peak pressure in the cylinder increase, the peak heat release rate decreases, the phase corresponding to the peak pressure is slightly advanced, the cyclic variation coefficient of the average indicated pressure increases, and the effective thermal efficiency decreases. The specific fuel consumption of inlet air mixed with 100% methanol solution decreases, and that of other volume fractions increases. In terms of emissions, when the intake air is sprayed with water, the CO and HC emissions are reduced, and the $ NO_{x} $ emissions increase. The HC emissions are reduced and the CO and $ NO_{x} $ emissions increase when the intake air is mixed with 30% methanol solution. The $ NO_{x} $ emissions are reduced and the CO and HC emissions increase when the intake air is mixed with 60%, 90% and 100% methanol solution.

Keywords: diesel engine; methanol aqueous solution; effective thermal efficiency; combustion; emission

作者信息

刘勇强 $ ^{1} $，耿洪刚 $ ^{1} $，徐昌春 $ ^{2} $，庄远 $ ^{1} $

(1. 合肥工业大学汽车与交通工程学院，安徽合肥 230009；2. 韩国国立公州大学机械汽车工学部，韩国天安 31080)

摘要和关键词

摘要: 文章在云内 D30 柴油机上研究进气掺混甲醇（甲醇体积分数分别为 0%、30%、60%、90%、100%）水溶液对发动机燃烧和排放性能的影响。结果表明：在柴油机进气中喷甲醇水溶液时，发动机燃烧特性参数（如缸内峰值压力）均有增加，放热率峰值降低，同时峰值压力对应的相位略微提前，平均指示压力循环变动系数升高，有效热效率下降，进气掺混甲醇体积分数为 100% 的溶液时的比油耗降低，其他体积分数时的比油耗均升高；排放方面，进气喷水时 CO 排放和碳氢化合物（HC）排放降低，氮氧化合物（ $ NO_{x} $）排放升高，进气掺混甲醇体积分数为 30% 的水溶液时 HC 排放降低，CO 排放和 $ NO_{x} $ 排放升高，进气掺混甲醇体积分数为 60%、90%、100% 的水溶液时 $ NO_{x} $ 排放降低，CO 和 HC 排放升高。

关键词: 柴油机；甲醇水溶液；有效热效率；燃烧；排放

Funding

国家自然科学基金资助项目（52076065）

合肥工业大学学报(自然科学版)

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