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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-472-4

ISBN Online: 978-1-56700-471-7

3rd Thermal and Fluids Engineering Conference (TFEC)
March, 4–7, 2018, Fort Lauderdale, FL, USA

TURBULENT COLD FLOW ANALYSIS OF SPARK IGNITION ENGINE

Get access (open in a dialog) pages 571-583
DOI: 10.1615/TFEC2018.cmd.022778

摘要

In this paper cold flow analysis was carried out to analyse flow characteristics in spark ignition (SI) Engine during intake and compression stroke. Most of the SI engines manufactured nowadays has a thermal efficiency of 30% to 35%, the remaining energy is wasted which effects the consumer economically and contributes to environmental pollution. This paper employs numerical techniques to help understand complex flow characteristics and their effect on the efficiency of SI engine. A 3-D model of an experimental SI engine was developed and the simulation results were validated against experimental data of literature. Multiple simulations were carried out using different combinations of rev/min and stroke lengths in order to investigate their effect on turbulence kinetic energy, which in turn effects the efficiency of an engine directly. It was observed that turbulence kinetic energy is directly proportional to rpm and stroke length. The data obtained from the analysis of different combinations of rpm and stroke lengths shows an increase in turbulence kinetic energy, throughout the cycle, with increase in rpm and/or stroke length. However, the overall trend of turbulence kinetic energy remains the same for all combinations of rpm and stroke lengths. Increased turbulence kinetic energy at spark ignition results in efficient combustion and increased mechanical efficiency of the SI engine. The swirl ratio and cross tumble ratios were also compared for different rpm and stoke to bore ratio, their variation with the crank angle is calculated and it was found that at the high crank angle, the swirl and cross tumble ratio changes its magnitude for their respective stoke to bore ratio, which was analysed for better understanding of the underlying phenomenon.