Effects of Liquid LPG Injection on Combustion Stability in  Spark Ignition Engine

Norrizal Mustaffa; Mas Fawzi; Amir Khalid; Shahrul Azmir Osman; Norrizam Jaat; Mohd  Mustaqim Tukiman

Authors

Norrizal Mustaffa Automotive and Combustion Synergies Technology Group, Advanced Technology Centre (ATC), Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, 84600 Pagoh, Johor, Malaysia
Mas Fawzi Automotive and Combustion Synergies Technology Group, Advanced Technology Centre (ATC), Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, 84600 Pagoh, Johor, Malaysia
Amir Khalid Automotive and Combustion Synergies Technology Group, Advanced Technology Centre (ATC), Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, 84600 Pagoh, Johor, Malaysia
Shahrul Azmir Osman Automotive Research Group (ARG), Centre for Energy and Industrial Environment Studies (CEIES), Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia
Norrizam Jaat Automotive Research Group (ARG), Centre for Energy and Industrial Environment Studies (CEIES), Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia
Mohd Mustaqim Tukiman Automotive and Combustion Synergies Technology Group, Advanced Technology Centre (ATC), Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, 84600 Pagoh, Johor, Malaysia

Keywords:

LPG, liquid injection, spark ignition, combustion stability, COV

Abstract

LPG is an alternative fuel that commonly used in spark ignition engine. The research on introducing the LPG into the combustion chamber has been extended to the liquid injection rather than conventional method which is gas injection. The objective of this study specifically is to evaluate the effects of liquid LPG injection on the combustion stability as compared to the gasoline fuel. The study was conducted using 1600cc naturally aspirated engine at 2000rpm and 3000rpm at various throttle position, which were 25%, 50%, 75% and 100% of its opening. The statistical analysis has been used in determining the combustion effectiveness through peak pressure analysis from 250 continuous combustion cycle. The results were compared with the gasoline fuel for each experimental condition. The results showed that liquid LPG injection has produced better combustion stability than gasoline fuel at almost all tested conditions.