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SIMULATION OF THE COMPRESSION RATIO EFFECTS ON THE COMBUSTION CHARACTERISTICS AND PERFORMANCE OF A SPARK IGNITION ENGINE | ||
| AL-TAQANI | ||
| Article 1, Volume 30, Issue 6, 2017, Pages 0-0 | ||
| Author | ||
| Rafeq A.Khalefa | ||
| Abstract | ||
| This study investigates the effects of compression ratio variations (7, 7.5, 8, 8.5 and 9) on the spark ignition engine performance (indicated power ,indicated thermal efficiency ,indicated specific fuel consumption and heat losses) and combustion characteristics (ignition delay ,turbulent flame speed and mass burning) by simulation method for the speeds of (1800, 2400 and 3300) rpm with a spark timing of (-20, -25 and -32.5) deg. for each speed respectively . The results showed that the compression ratio has a great influence on some parameters of combustion characteristics and engine performance. Where any increase in this ratio increases most combustion characteristics except mass burning rate which is affected only by engine speed and spark timing ,while the power, efficiency and (I.S.F.C) are improved significantly , with a little increasing of heat losses through the combustion chamber walls | ||
| Keywords | ||
| SI engines; performance; compression ratio; simulation; combustion characteristics | ||
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