基于Spearman相关性和燃烧三维数值计算的汽油机碳氢排放分析

doi:10.13229/j.cnki.jdxbgxb.20230590

Abstract

Abstract:

Firstly， Spearman correlation analysis was used to design the characteristic parameters based on face-to-volume ratio， face-to-face ratio， side clearance and back clearance volumes， firepower shore volume， cylinder gasket dead zone volume， clearance volume， and the proportion of each volume， and investigate their effects on hydrocarbon emissions under cold start conditions. Then， the effect was explained from the viewpoint of combustion chamber geometry and combustion process by using combustion 3D simulation. The results show that the clearance volume and clearance volume proportion have the strongest correlation with cold start hydrocarbon emissions， and the other characteristic parameters have very little correlation with cold start hydrocarbon emissions. Meanwhile， Spearman correlation coefficient r_s and one-tailed test P-value of clearance volume proportion are 0.753 8 and <0.01 respectively， which mean the correlation is very significant. The pre-combustion chamber jet ignition engine in cold start condition is consistent with the conclusion of the above correlation analysis， but in theoretical air fuel ratio hot engine condition， the hydrocarbon emission of jet ignition is significantly lower than that of spark ignition because the high temperature jet from the pre-combustion chamber enters the combustion chamber clearance earlier， ignites the mixture in it， and consumes the fuel near the wall early in the combustion， and in lean combustion， it does not have higher hydrocarbon emission although it has lower combustion temperature. This also explains and confirms the mechanism of the effect of clearance volume and clearance volume proportion on hydrocarbon emission from another perspective. The research results can provide a theoretical basis and support for the design of gasoline engine combustion system structure.

Key words: energy and power engineering, Spearman correlation analysis, hydrocarbon emission, combustion chamber geometry structure, three-dimensional numerical calculation of combustion, jet ignition, spark ignition

CLC Number:

TK411

Hui-chao ZHAO,Yao-dong LIU,Ming-li LIU,Yan-feng GONG,Xian LI,Chuan ZHAO,Ping SUN. Analysis of hydrocarbon emissions from gasoline engines based on spearman correlation and three⁃dimensional numerical calculation of combustion[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(3): 829-838.

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References 23

1	中华人民共和国生态环保部. 中国移动源环境管理年报(2021年)[R]. 北京: 中华人民共和国生态环保部,2021.
2	Kim D, Shin J, Son Y, et al. Characteristics of in-cylinder flow and mixture formation in a high-pressure spray-guided gasoline direct-injection optically accessible engine using PIV measurements and CFD[J]. Energy Conversion and Management, 2021, 248: No.114819.
3	Benekos S, Frouzakis C E, Giannakopoulos G K, et al. A 2-D DNS study of the effects of nozzle geometry, ignition kernel placement and initial turbulence on prechamber ignition[J]. Combustion and Flame, 2021, 225(5): 272-290.
4	Zhu R C, Hu J N, Bao X F,et al. Tailpipe emissions from gasoline direct injection (GDI) and port fuel injection (PFI) vehicles at both low and high ambient temperatures[J]. Environmental Pollution, 2016, 216: 223-234.
5	Henein N A, Tagomori M K. Cold-start hydrocarbon emissions in port-injected gasoline engines[J]. Progress in Energy & Combustion Science, 1999, 25(6): 563-593.
6	Luan Y, Henein N A, Tagomori M K. Port-fuel-injection gasoline engine cold start fuel calibration[C]∥SAE Technical Papers, 2006-01-1052.
7	Zhang Q, Xian K, Li M H. Investigation of performance and emission characteristics on a large-bore spark-ignition natural gas engine with scavenged prechamber and miller cycle attribute [J]. Journal of Energy Engineering, 2017, 143(5): No.04017026.
8	Li M H, Zhang Q, Li G X. Emission characteristics of a natural gas engine operating in lean-burn and stoichiometric modes[J]. Journal of Energy Engineering, 2016, 142(3): No.04015039.
9	Albuquerque P, Ávila R, Zárante P, et al. Lubricating oil influence on exhaust hydrocarbon emissions from a gasoline fueled engine[J]. Tribology International, 2011, 44(12): 1796-1799.
10	黄佐华, 周龙保, 马凡华,等. 火花点火发动机缸内壁面积碳层处未燃碳氢生成和释放过程的数值计算[J]. 西安交通大学学报, 1994, 28(6):7-14.
	Huang Zuo-hua, Zhou Long-bao, Ma Fan-hua, et al. Numerical calculation of the generation and release process of unburned hydrocarbons at the carbon layer on the inner wall area of a spark ignition engine cylinder[J]. Journal of Xi'an Jiaotong University, 1994, 28(6): 7-14.
11	杨尚升, 黄勇成, 曹银波. 停缸技术对缸内直喷点燃式发动机燃烧与排放及燃油经济性的影响[J]. 西安交通大学学报, 2020, 54(7): 68-74.
	Yang Shang-sheng, Huang Yong-cheng, Cao Yin-bo. Influence of cylinder deactivation (CDA) on combustion and emission characteristics and fuel economy of direct-injection spark-iginition engine[J]. Journal of Xi'an Jiaotong University, 2020, 54(7): 68-74.
12	Heywood J B. Internal Combustion Engine Fundamentals[M]. New York: McGraw-Hill, 1988.
13	Spearman C S. The proof and measurement of association between two things[J]. The American Journal of Psychology, 1904, 15(1): 72-101.
14	Zar J H.Significance testing of the Spearman rank correlation coefficient[J]. Journal of the American Statistical Association, 1972, 67(339): 578-580.
15	苗海燕, 黄佐华, 李继军, 等. 汽油机燃用含氧燃料时碳氢生成过程的研究[J]. 西安交通大学学报, 1998, 32(7): 32-36.
	Miao Hai-yan, Huang Zuo-hua, Li Ji-jun, et al. Reduction of unburned hydrocarbon for spark ignition engine using oxygenated fuel blends [J]. Journal of Xi'an Jiaotong University, 1998, 32(7): 32-36.
16	Richards K, Senecal P, Pomraning E. Converge (version 3.0) Manual[M]. Madison: Convergent Science, Inc., 2020.
17	Han Z, Reitz R D. Turbulence modeling of internal combustion engines using RNG κ-ε models[J]. Combustion Science and Technology, 1995, 106(4-6):267-295.
18	Han Z, Reitz R D. A temperature wall function formulation for variable-density turbulent flows with application to engine convective heat transfer modeling[J]. International Journal of Heat & Mass Transfer, 1997, 40(3): 613-625.
19	Long L, Reitz R D, Iyer C O, et al. Modeling knock in spark-ignition engines using a G-equation combustion model incorporating detailed chemical kinetics[C]∥SAE Technical Papers, 2007-01-0165.
20	Chinnathambi P, Bunce M, Cruff L. RANS based multidimensional modeling of an ultra-lean burn pre-chamber combustion system with auxiliary liquid gasoline injection[C]∥SAE Technical Papers, 2015-01-0386.
21	Liu Y D, Jia M, Xie M Z, et al.Development of a new skeletal chemical kinetic model of toluene reference fuel with application to gasoline surrogate fuels for computational fluid dynamics engine simulation[J].Energy & Fuels, 2013, 27(8): 4899-4909.
22	Attard W P, Blaxill H. A lean burn gasoline fueled pre-chamber jet ignition combustion system achieving high efficiency and low NOx at part load[C]∥SAE Technical Papers, 2012-01-1146.
23	Müller C, Pischinger S, Tews S, et al. Analysis of experimental results with an active pre-chamber ultra-lean burn SI engine[J]. International Journal of Engine Research, 2021, 22(10): 3103-3127.

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发动机	缸径/mm	冲程/mm	压缩比
1.0 L发动机	72	81.8	10
1.2 L发动机	72	73.6	9.8
1.4 L发动机A	76.5	75.6	10
1.4 L发动机B	76.5	75.6	11.5
1.5 L发动机A	76.5	81.5	11.5
1.5 L发动机B	76.5	81.5	10.7
1.6 L发动机	76.5	86.9	11.5
2.0 L发动机A	84	90	10.3
2.0 L发动机B	82.5	93	10.6
2.0 L预燃室发动机	82.5	113	17.5

样本数量n	单尾检测P值					双尾检测P值
样本数量n	0.25	0.1	0.05	0.025	0.01	0.5	0.2	0.1	0.05	0.02
4	0.6	1	1			0.6	1	1
5	0.5	0.8	0.9	1	1	0.5	0.8	0.9	1	1
6	0.371	0.657	0.829	0.886	0.943	0.371	0.657	0.829	0.886	0.943
7	0.321	0.571	0.714	0.786	0.893	0.321	0.571	0.714	0.786	0.893
8	0.31	0.524	0.643	0.738	0.833	0.31	0.524	0.643	0.738	0.833
9	0.267	0.483	0.6	0.7	0.783	0.267	0.483	0.6	0.7	0.783
10	0.248	0.455	0.564	0.648	0.745	0.248	0.455	0.564	0.648	0.745
11	0.236	0.427	0.536	0.618	0.709	0.236	0.427	0.536	0.618	0.709
12	0.217	0.406	0.503	0.587	0.678	0.217	0.406	0.503	0.587	0.678
13	0.209	0.385	0.484	0.56	0.648	0.209	0.385	0.484	0.56	0.648
14	0.2	0.367	0.464	0.538	0.626	0.2	0.367	0.464	0.538	0.626
15	0.189	0.354	0.446	0.521	0.604	0.189	0.354	0.446	0.521	0.604

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Analysis of hydrocarbon emissions from gasoline engines based on spearman correlation and three⁃dimensional numerical calculation of combustion

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