Journal
FUEL
Volume 327, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.125221
Keywords
Liquefied petroleum gas; Knock; Exhaust gas recirculation; Ignition delay; Livengood-Wu integral; CFD
Categories
Funding
- Department of Energy (DOE)
- Office of Energy Efficiency and Renewable Energy (EERE) [DE-EE0009198]
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This study investigates the effects of different LPG fuels and exhaust gas recirculation (EGR) on a spark-ignited cooperative fuel research (CFR) engine through experimental and numerical analysis. Results show that fuel composition has a significant impact on engine combustion characteristics, and the introduction of EGR helps reduce knock intensity.
This paper presents an experimental and numerical investigation of a spark-ignited (SI) cooperative fuel research (CFR) engine fueled with different liquefied petroleum gas (LPG) fuels and exhaust gas recirculation (EGR). The effects of LPG fuel composition on engine combustion characteristics are initially evaluated at two different compression ratios (CR). Results show normal combustion at CR 7 and heavy knocking combustion at CR 10 for all the tested fuels, with a more substantial impact for the LPG fuel with high proportions of n-butane species. The Livengood-Wu (LW) integral method is then used to analyze the knock occurrence risk of individual fuel based on the reactivity of the tested fuels. The introduction of EGR then demonstrates the potential of knock intensity reduction below the borderline knock limit. A zonal-based kinetic interactions study is also performed to understand the knock mitigation effectiveness of EGR over the pressure-temperature domain relevant to SI engine operation. Finally, a multidimensional, computational fluid dynamics (CFD) simulation model is shown to predict the LPG combustion characteristics and presents the evolution of in-cylinder temperature and chemical species to demonstrate the development of end-gas autoignition events without and with EGR.
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