PERFORMANCE AND EXHAUST EMISSION CHARACTERISTICS OF A DIESEL ENGINE USING ALTERNATIVE FUELS | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 8, Volume 41, No 6, November and December 2013, Page 2140-2159 PDF (489.19 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2013.114953 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Saad Awad Abdelrahman | ||||
| Mech. Science, Eng., Dept., The specialized Studies Academy, Ministry of Higher Education. | ||||
| Abstract | ||||
| The present work introduces an improvement performance and reduces the exhaust emissions of Diesel engine. The experimental comparative study of the combustion characteristics and exhaust emissions for a single cylinder Diesel engine using LPG-Diesel and CNG-Diesel dual fuels separately are studied. Different ratios of LPG and CNG in Diesel fuel up to 70% were used respectively. The test rig was furnished with a computer-controlled data acquisition system and the necessary measuring instruments to measure and record ignition delay, combustion duration, peak cylinder pressure, dual specific fuel consumption and exhaust emissions. The engine was tested at different speeds and loads. The results indicated that the ignition delay of both LPG-Diesel and CNG-Diesel dual fuel are obviously longer than that of Diesel fuel only. The combustion duration for the two cases is slightly reduced with the increase of gaseous fuel ratio at low speeds; however, it increases at high speeds. As gaseous fuel ratio is increased, the peak cylinder pressure is slightly reduced at low loads, however, at high loads; the peak cylinder pressure strongly decreases. The level of NOx emissions under dual fuel operation is lower than normal Diesel operation at different gaseous fuel ratios. CO and HC emissions for the two cases decrease with the increase of gaseous fuel ratio. The dual specific fuel consumption slightly increases with the increase of gaseous fuel ratio. The final results showed that when using CNG dual fuel, the combustion performance increases while the exhaust emissions decrease compared with Diesel and LPG dual fuel. | ||||
| Keywords | ||||
| LPG; CNG; Dual fuel combustion, Diesel engine; Performance, Exhaust emissions | ||||
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