INFLUENCE OF COMPRESSION RATIO ON THE PERFORMANCE CHARACTERISTICS OF A SPARK IGNITION ENGINE
INFLUENCE OF COMPRESSION RATIO ON THE PERFORMANCE CHARACTERISTICS OF A SPARK IGNITION ENGINE
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Date
2012-02
Authors
TOPE, AINA
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Abstract
The need to improve the performance characteristics of the gasoline engine has necessitated
the present research. Increasing the compression ratio below detonating values to improve
on the performance is an option. The compression ratio is a factor that influences the
performance characteristics of internal combustion engines. This work is a an experimental
and theoretical investigation of the influence of the compression ratio on the brake power,
brake thermal efficiency, brake mean effective pressure and specific fuel consumption of
aRicardo variable compression ratio spark ignition engine. A range of compression ratios of
5, 6, 7, 8 and 9, and engine speeds of1100 to 1600rpm, in increments of 100rpm, were
utilised. The results showsthat as the compression ratio increases, the actual fuel
consumption decreasesaveragely by 7.75%, brake thermal efficiency improves by 8.49 %
and brake power also improves by 1.34%. The optimum compression ratio corresponding to
maximum brake power, brake thermal efficiency, brake mean effective pressure and lowest
specific fuel consumption is 9.The theoretical values were compared with experimental
values. The grand averages of the percentage errorsbetween the theoretical and experimental
valuesfor all the parameters were evaluated. The small values of the percentage errors
between the theoretical and experimental values show that there is agreement between the
theoretical and experimental performance characteristics of the engine.
Description
A THESIS SUBMITTED TO THE POST GRADUATE SCHOOL, AHMADU
BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILMENT OF THE AWARD OF MASTERS OFSCIENCE IN
MECHANICAL ENGINEERING (ENERGY)
MECHANICAL ENGINEERING DEPARMENT
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY
ZARIA
FEBRUARY, 2012
Keywords
INFLUENCE, COMPRESSION RATIO, PERFORMANCE CHARACTERISTICS, SPARK IGNITION ENGINE