Title: Effect of different hydrogen-oxygen flow rates on the performance and emissions of SI engine

Authors: Mohamed Brayek; Mohamed Ali Jemni; Gueorgui Kantchev; Mohamed Salah Abid

Addresses: Laboratory of the Electromechanical System (LASEM), Department of Mechanical Engineering, National School of Engineers of Sfax (ENIS), BP 1173, Avenue of Soukra, 3038, Sfax, Tunisia; Mechanical Technology Department, Wadi Ad-Dawasir College of Technology, Technical and Vocational Training Corporation, Saudi Arabia ' Laboratory of the Electromechanical System (LASEM), Department of Mechanical Engineering, National School of Engineers of Sfax (ENIS), BP 1173, Avenue of Soukra, 3038, Sfax, Tunisia ' Laboratory of the Electromechanical System (LASEM), Department of Mechanical Engineering, National School of Engineers of Sfax (ENIS), BP 1173, Avenue of Soukra, 3038, Sfax, Tunisia ' Laboratory of the Electromechanical System (LASEM), Department of Mechanical Engineering, National School of Engineers of Sfax (ENIS), BP 1173, Avenue of Soukra, 3038, Sfax, Tunisia

Abstract: In this study, a water electrolyser was designed and manufactured to produce hydrogen and oxygen mixture (H2/O2). The produced gas was consumed instantaneously in order to eliminate the need for a storage device. The objective of the study was to investigate the effect of adding this mixture at various flow rates (0 L/min, 2.5 L/min, 5 L/min and 7.5 L/min) on the performance [the brake specific fuel consumption (BSFC) and the exhaust gas temperature] and emissions (HC, CO, CO2 and NOx) of a single cylinder 98 cm3 spark ignition engine. Tests were conducted under different engine loads (0%, 20%, 50%, 80% and 100%). The results show that at all engine loads, with the increase of the H2/O2 flow rate, the exhaust gas temperature as well as BSFC decrease significantly. Also, HC, CO and CO2 were improved. But, NOx emissions decreased only at low loads. At high load conditions, a dramatic rise of NOx emissions was observed. [Received: January 4, 2016; Accepted: June 22, 2016]

Keywords: engine load; exhausts emissions; SI engine; hydrogen; oxygen.

DOI: 10.1504/IJOGCT.2017.083871

International Journal of Oil, Gas and Coal Technology, 2017 Vol.15 No.1, pp.94 - 106

Available online: 11 Apr 2017 *

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