Effects of fuel combination and IVO timing on combustion and emissions of a dual-fuel HCCI combustion engine

doi:10.1007/s11708-020-0698-8

Front. Energy

2020, Vol. 14

Issue (4) : 778-789 https://doi.org/10.1007/s11708-020-0698-8

RESEARCH ARTICLE

Effects of fuel combination and IVO timing on combustion and emissions of a dual-fuel HCCI combustion engine

Xin LIANG, Jianyong ZHANG, Zhongzhao LI, Jiabo ZHANG, Zhen HUANG, Dong HAN(

)

Key Laboratory for Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China

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Abstract

This paper experimentally and numerically studied the effects of fuel combination and intake valve opening (IVO) timing on combustion and emissions of an n-heptane and gasoline dual-fuel homogeneous charge compression ignition (HCCI) engine. By changing the gasoline fraction (GF) from 0.1 to 0.5 and the IVO timing from –15°CA ATDC to 35°CA ATDC, the in-cylinder pressure traces, heat release behaviors, and HC and CO emissions were investigated. The results showed that both the increased GF and the retarded IVO timing delay the combustion phasing, lengthen the combustion duration, and decrease the peak heat release rate and the maximum average combustion temperature, whereas the IVO timing has a more obvious influence on combustion than GF. HC and CO emissions are decreased with reduced GF, advanced IVO timing and increased operational load.

Keywords homogeneous charge compression ignition dual-fuel n-heptane gasoline intake valve opening timing

Corresponding Author(s): Dong HAN

Online First Date: 25 September 2020 Issue Date: 21 December 2020

Cite this article:

Xin LIANG,Jianyong ZHANG,Zhongzhao LI, et al. Effects of fuel combination and IVO timing on combustion and emissions of a dual-fuel HCCI combustion engine[J]. Front. Energy, 2020, 14(4): 778-789.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-020-0698-8
https://academic.hep.com.cn/fie/EN/Y2020/V14/I4/778

Tab.1 Specification of test engine

Fig.1 Modified valve lift profiles for HCCI experiment.

Tab.2 Experimental condition

Tab.3 Computational models

Fig.2 Grid distribution at bottom dead center (n = 1600 r/min, T = 50 N?m).

Fig.3 Comparison between the experimental and simulated in-cylinder pressures and HRRs with (a) varied GFs at 50 N?m; (b) varied GFs at 40 N?m.

Fig.4 Effects of GFs on in-cylinder pressures and HRRs at the loads of (a) 50N?m and (b) 40 N?m.

Fig.5 Effects of GFs on (a) CA10 and (b) CA50.

Fig.6 Temperature distribution contours in the low-temperature heat release stages at different GFs.

Fig.7 Temperature distribution contours in the high-temperature heat release stages at different GFs.

Fig.8 Effects of GFs on brake specific fuel consumption.

Fig.9 (a) HC and (b) CO emissions at changed GFs and engine loads.

Fig.10 CO concentration in the combustion chamber at different GFs.

Fig.11 Effects of IVO timings on in-cylinder pressures and HRRs.

Fig.12 Effects of IVO timings on (a) CA10 and (b) CA50.

Fig.13 Temperature distribution contours in the low-temperature heat release stage at different IVO timings.

Fig.14 Temperature distribution contours in the high-temperature heat release stage at different IVO timings.

Fig.15 Effects of IVO timings on (a) HC and (b) CO emissions at changed GFs.

Fig.16 CO concentration in the combustion chamber with different IVO timings.

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