Effects of Water Injection Strategies on Oxy-Fuel Combustion Characteristics of a Dual-Injection Spark Ignition Engine

Xiang Li, Yiqiang Pei, Dayou Li, Tahmina Ajmal, Khaqan-Jim Rana, Abdel Aitouche, Raouf Mobasheri and Zhijun Peng
Additional contact information
Xiang Li: School of Computer Science and Technology, University of Bedfordshire, Luton LU1 3JU, UK
Yiqiang Pei: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Dayou Li: School of Computer Science and Technology, University of Bedfordshire, Luton LU1 3JU, UK
Tahmina Ajmal: School of Computer Science and Technology, University of Bedfordshire, Luton LU1 3JU, UK
Khaqan-Jim Rana: School of Computer Science and Technology, University of Bedfordshire, Luton LU1 3JU, UK
Abdel Aitouche: UMR 9189–CRIStAL—Centre de Recherche en Informatique Signal et Automatique de Lille, CNRS, Centrale Lille, Université de Lille, F-59000 Lille, France
Raouf Mobasheri: UMR 9189–CRIStAL—Centre de Recherche en Informatique Signal et Automatique de Lille, CNRS, Centrale Lille, Université de Lille, F-59000 Lille, France
Zhijun Peng: School of Engineering, University of Lincoln, Lincoln LN6 7TS, UK

Energies, 2021, vol. 14, issue 17, 1-24

Abstract: Currently, global warming has been a serious issue, which is closely related to anthropogenic emission of Greenhouse Gas (GHG) in the atmosphere, particularly Carbon Dioxide (CO 2 ). To help achieve carbon neutrality by decreasing CO 2 emissions, Oxy-Fuel Combustion (OFC) technology is becoming a hot topic in recent years. However, few findings have been reported about the implementation of OFC in dual-injection Spark Ignition (SI) engines. This work numerically explores the effects of Water Injection (WI) strategies on OFC characteristics in a practical dual-injection engine, including GDI (only using GDI), P 50 -G 50 (50% PFI and 50% GDI) and PFI (only using PFI). The findings will help build a conceptual and theoretical foundation for the implementation of OFC technology in dual-injection SI engines, as well as exploring a solution to increase engine efficiency. The results show that compared to Conventional Air Combustion (CAC), there is a significant increase in BSFC under OFC. Ignition delay ( ? F ) is significantly prolonged, and the spark timing is obviously advanced. Combustion duration ( ? C ) of PFI is a bit shorter than that of GDI and P 50 -G 50 . There is a small benefit to BSFC under a low water-fuel mass ratio ( R w f ). However, with the further increase of R w f from 0.2 to 0.9, there is an increment of 4.29%, 3.6% and 3.77% in BSFC for GDI, P 50 -G 50 and PFI, respectively. As WI timing ( t W I ) postpones to around ?30 °CA under the conditions of R w f ? 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 maximum cylinder pressure ( P m a x ) and combustion phasing is less affected by WI temperature ( T W I ) compared to the effects of R w f or t W I . BSFC just has a small decline with the increase of T W I from 298 K to 368 K regardless of the injection strategy. Consequently, appropriate WI strategies are beneficial to OFC combustion in a dual-injection SI engine, but the benefit in fuel economy is limited.

Keywords: oxy-fuel combustion (OFC); water injection (WI) strategies; dual-injection spark ignition (SI) engine; simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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