Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios

Li, Xiang, Pei, Yiqiang and Peng, Zhiun (2021) Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios. International Journal of Engine Research . ISSN 1468-0874

Full content URL: https://www.doi.org/10.1177/14680874211022292

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Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios
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Abstract

In order to achieve carbon neutrality by decreasing Carbon Dioxide (CO2) emissions, Oxy-Fuel Combustion (OFC) technology with Carbon Capture and Storage (CCS) is becoming a hot topic in the field of Internal Combustion Engine (ICE). However, almost no research has been reported about the implementation of OFC in dual-injection Spark Ignition (SI) engine. This article presents a numerical study about the effects of Water Injection (WI) strategies on OFC in a dual-injection Spark Ignition (SI) engine, with Gasoline Direct Injection (GDI), Port Fuel Injection (PFI) and P50-G50 (50% PFI and 50% GDI) three injection strategies. The results show that compared to Conventional Air Combustion (CAC), there is a significant increase in BSFC under OFC. θ_F is significantly prolonged, and the spark timing is obviously advanced. The θ_C of PFI is a bit shorter than that of GDI and P50-G50. There is a small benefit to BSFC under low R_wf. However, with the further increase of R_wf from 0.2 to 0.9, there is an increment of 4.29%, 3.6% and 3.77% in BSFC for GDI, P50-G50 and PFI, respectively. As t_WI postpones to around -30 °CA under the conditions of R_wf ≥ 0.8, BSFC has a sharp decrease of more than 6 g/kWh, and this decline is more evident under GDI injection strategy. The variation of Pmax and φ_CA50 is less affected by T_WI compared to the effects of R_wf or t_WI. BSFC just has a small decline with the increase of T_WI from 298K to 368K regardless of the injection strategy. Consequently, it is feasible to implement appropriate WI strategies to control OFC characteristics in a dual-injection SI engine, but the benefit in fuel economy is limited.

Keywords:Oxy-fuel combustion, dual-injection spark ignition engine, intake temperature, oxygen mass fraction, simulation
Subjects:H Engineering > H300 Mechanical Engineering
Divisions:College of Science > School of Engineering
ID Code:45322
Deposited On:18 Jun 2021 11:20

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