Journal of Petroleum & Environmental Biotechnology

The effects of research octane number and fuel systems on the performance and emissions of a spark ignition engine: A study on Saudi Arabian RON91 and RON95 with port injection and direct injection systems

3^rd World Congress on Petrochemistry and Chemical Engineering

November 30-December 02, 2015 Atlanta, USA

Ibrahim Alshunaifi1, Saud Binjuwair1, Taib Iskandar Mohamad2, 3, Ahmed Almaleki1 and Abdullah Alkudsi1

1King Abdulaziz City of Science and Technology, Saudi Arabia 2Universiti Kebangsaan Malaysia, Malaysia 3Royal Commission of Yanbu College and Institute, Saudi Arabia

Scientific Tracks Abstracts: J Pet Environ Biotechnol

Abstract:

This research aims to experimentally analyze the performance and emissions of a single cylinder, four-stroke Spark Ignition (SI) engine fuelled by two grades of gasoline used in Saudi Arabia, RON91 and RON95 while operating with two fuel delivery systems; Port Injection (PI) and Direct Injection (DI). The experiments were conducted on a single cylinder research engine with pent-roof type cylinder head that can be interchangeably operated with either port injection or direct injection. Brake power, Brake Specific Fuel Consumption (BSFC) and exhaust emissions were measured at different engine speeds, loads and fixed compression ratio of 10:1. Cylinder pressure, mass burnt fraction and rate of heat release were analyzed. The experimental results showed that the brake power of the engine is higher with RON91 which is mainly due to higher heating value. The BSFC decreases with increasing in engine load and it increases with increasing engine speed. However, there are no noticeable differences between two tested gasoline fuels in the BSFC except at high speed and load, where BSFC of RON91 is higher than RON95. Combustion analysis showed a mixed response to different RON and fuel systems. Generally, combustion of RON95 is faster than RON91 in both PI and DI systems. In DI system, RON95 showed longer combustion duration at low speed and load. The concentrations of Nitrogen Oxides (NOX), Carbon Monoxide (CO) and Total Hydrocarbon (THC) emissions in the exhaust system were measured. It is observed that NOX emissions of RON91 are higher than RON95 in most cases except at high engine speed with DI system. It is also detected that CO emissions of RON91 are higher than RON95 in both injection systems at higher load. It is also noticed that RON91 system has higher THC emissions.

Biography :

Ibrahim Abdullah Alshunaifi compled his Phd and working as an Assistant Research Professor at King Abdulaziz City for Science and Technology (KACST), Saudi Arabia.

Email: ialshunaifi@kacst.edu.sa