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EFFICIENCY CHARACTERISTICS OF A NEW QUASI-CONSTANT VOLUME COMBUSTION SPARK IGNITION ENGINE

ABSTRACT
A zero dimensional model has been used to investigate the combustion performance of a four cylinder petrol engine with unconventional piston motion. The main feature of this new spark ignition (SI) engine concept is the realization of quasi-constant volume (QCV) during combustion process. Presented mechanism is designed to obtain a specific motion law which provides better fuel consumption of internal combustion (IC) engines. These advantages over standard engine are achieved through synthesis of unconventional piston mechanism. The numerical calculation was performed for several cases of different piston mechanism parameters, compression ratio and engine speed. Calculated efficiency and power diagrams are plotted and compared with performance of ordinary SI engine. The results show that combustion during quasi-constant volume has significant impact on improvement of efficiency. The main aim of this paper is to find a proper kinematics parameter of unconventional piston mechanism for most efficient heat addition in SI engines.[Acknowledgment. This research was done as a part of project TR31046 "Improvement of the quality of tractors and mobile systems with the aim of increasing competitiveness and preserving soil and environment", supported by Serbian Ministry of Science and Technological Development.]
KEYWORDS
PAPER SUBMITTED: 2012-05-30
PAPER REVISED: 2012-08-27
PAPER ACCEPTED: 2012-09-05
DOI REFERENCE: https://doi.org/10.2298/TSCI120530158D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2013, VOLUME 17, ISSUE 1, PAGES [119 - 133]
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