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Title: Effect of fuel composition and EGR on spark-ignited engine combustion with LPG fueling: Experimental and numerical investigation

Journal Article · · Fuel
 [1];  [2];  [2];  [2];  [2]
  1. Colorado State Univ., Fort Collins, CO (United States); King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia); OSTI
  2. Colorado State Univ., Fort Collins, CO (United States)
+ Show Author Affiliations

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). Here, 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.

Research Organization:
Colorado State Univ., Fort Collins, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0009198
OSTI ID:
2418077
Journal Information:
Fuel, Journal Name: Fuel Journal Issue: C Vol. 327; ISSN 0016-2361
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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02 PETROLEUM
CFD
Energy & Fuels
Engineering
Exhaust gas recirculation
Ignition delay
Knock
Liquefied petroleum gas
Livengood-Wu integral