Browse Publications Technical Papers 2019-26-0088
2019-01-19

Experimental Investigations on Lean Burn Spark Ignition Engine Using Methanol – Gasoline Blends 2019-26-0088

The present study discusses the effects of methanol blended gasoline fuel on performance, emission and combustion characteristics of a lean burn Spark Ignition (SI) engine. Various performance characteristics such as brake power brake thermal efficiency, brake specific fuel consumption and various emission parameters such as hydrocarbons (HC), carbon monoxide (CO), carbon dioxide (CO2) and Oxides of nitrogen (NOx) were measured with pure gasoline and different methanol-gasoline blends were studied. In this work, methanol-gasoline blends were prepared on volume basis where methanol proportions of 5%, 10%, and 20% were blended with 95%, 90%, and 80% of pure gasoline respectively. The base diesel engine (Kirloskar TAF1) having a compression ratio of 17.5:1 was modified to operate as SI engine by modifying the compression ratio, providing the ignition system by replacing the fuel injection pump and the injector and developing a manifold injection system. Experiments were carried on a single cylinder four-stroke diesel engine made to operate as SI engine at a compression ratio of 10.5:1, constant speed of 1500 rpm with different methanol proportions (5%, 10%, and 20% ) blended to gasoline under part throttle condition at diverse equivalence ratios. Results revealed that with 5% methanol blend, there was an increase of 5.5% and 4.1% in brake power output and brake thermal efficiency when compared to gasoline in lean combustion. With 5% blends, HC emissions were reduced by 40%, whereas NOx emissions showed a rise. Heat release rate and cylinder pressure were higher for all methanol blends compared to gasoline. Overall, 5% methanol blend can be considered the most suitable for lean burn operation of SI engine. K. Ravi , D. Suresh , Sandeep kumar, N. Maheswar Reddy School of Mechanical Engineering, Vellore Institute of Technology, Vellore, India Automotive Research Centre, School of Mechanical Engineering, Vellore Institute of Technology, Vellore - 632 014, India, e-mail: ravi.krishnaiah@vit.ac.in

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