Abstract
A loaded four stroke compression ignition (Nissan Primera model) engine mounted in a heat engine laboratory of Enugu State University of Science and Technology Enugu was used for the exercise. An absorption dynamometer was attached to the engine to measure torque. As the engine was running, the speed was recorded with a digital tachometer at a time frame of 20 seconds. A lot of tests were carried out to determine a number of parameters like specific fuel consumption, mechanical efficiency, fuel mass flow rate, indicated power, brake power, brake horse power, rate of fuel consumption at different gear ratios. The data so obtained were tabulated and relationship between various parameters plotted in graphs. Results show that: volume of diesel consumed increases with increasing engine speed, increases with increasing gear; mass flow rate of diesel increases with increasing brake power, increases with increasing gear; specific fuel consumption decreases with increasing engine speed ; specific fuel consumption also decreases with increasing brake power; indicated power increases as engine speed increases. Keywords : Diesel Engine, Absorption Dynamometer, Tachometer, Engine Torque, Brake Horse Power, DOI : 10.7176/JETP/9-8-04 Publication date: November 30 th 2019
Highlights
The compression-ignition engine is an internal combustion engine designed to convert the chemical energy available in fuel into mechanical energy
Brake Power (BP): The power developed by an engine and measured at the output shaft is called the brake power and is expressed by Eastop and McConkey (2005) as: www.iiste.org
Mechanical efficiency: This is defined as the ratio of brake power to indicated power and is expressed by Eastop and McConkey (2005) as:
Summary
Nomenclature : L = Load (N) T = Torque (N-m) N = Shaft speed (rpm) BP = Brake Power (Kw) Q = Volume flow rate (m3/s) BHP = Brake Horse Power (Kw) IP = Indicated Power (Kw) mf = mass flow rate of fuel (kg/h) ηm = Mechanical efficiency (%) SFC = Specific Fuel Consumption (kg/kwh) 1.0: INTRODUCTION: The compression-ignition engine is an internal combustion engine designed to convert the chemical energy available in fuel into mechanical energy. The two basic mechanical designs of this engine are 2 – stroke and 4 – stroke, which are used to achieve the operational sequence of intake, compression, combustion and exhaust strokes (Heywood,1998). Brake Power (BP): The power developed by an engine and measured at the output shaft is called the brake power and is expressed by Eastop and McConkey (2005) as: www.iiste.org
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