Using blended Fuel of Ethanol and Petrol Analyze Performance of a Multi - Cylinder Spark Ignition Engine

Satyaveer Singh

Abstract: The purpose of this study is to experimentally determine the optimal blend rate of ethanol - gasoline fuels in order to maximize brake thermal efficiency of a commercial SI engine. In this study, the engine performance, in term of brake torque and brake specific fuel consumption, has been investigated with variation of volumetric mixing ratio between 87.5 - octane gasoline and 99.5% - purity ethanol (E0, E10, E20, E30, E40, and E50). The experiment has been conducted at different engine speeds and percentages of intake - throttle opening. The tests were performed at constant compression ratio. The experimental results indicated that the appropriate ethanol - gasoline mixing ratio can enhance engine torque output, especially at low engine speed. The brakes thermal efficiency is maximum when the engine operates with a speed of 2000 - 2500 rpm, using E40 and E50 fuels. This paper also provides a guideline for suitable ethanol - gasoline blend rate at certain engine load and speed.

Keywords: Ethanol, Ethanol - gasoline blends, SI engine, Performance