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Published bySelina Purser Modified about 1 year ago

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AE 427 THERMODYNAMIC CYCLE SIMULATION Prof.Dr. Demir Bayka

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COMPRESSION THE CLEARANCE VOLUME CONTAINS RESIDUAL GASES FROM PREVIOUS CYCLE SOME AMOUNT OF EXHAUST GASES MAY BE INDUCED BY RECIRCULATION (EGR) AIR/FUEL MIXTURE IS INDUCED

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TEMPERATURE OF THE RESIDUAL GASES WILL BE HIGH (~1500 K) TEMPERATURE OF THE RECIRCULATED EXHAUST GASES WILL BE LOWER (~900 K) TEMPERATURE OF THE AIR/FUEL MIXTURE WILL BE LOWEST (~300 K) COMPRESSION

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FOR A MIXTURE OF GASES MOLECULAR WEIGHT: SPECIFIC GAS CONSTANT where R 0 =8.314 kJ/kmol-K

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SPECIFIC HEAT OF A GAS MIXTURE

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SPECIFIC HEAT RELATIONS units are kJ/kmol-K also

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ALGORITHMS coefficients A ij can be obtained from pages 131 & 133 of your reference book

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AIR = OXYGEN + NITROGEN (and some CO2 and Argon) CO2 and Argon may be assumed as part of Nitrogen such that

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FOR UNIT VOLUME OF O 2 4.773 units of AIR = O 2 + 3.773 units of N 2 ’ O 2 is approximately 21% of AIR (on a volume basis)

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COMPOSITION OF UNBURNED MIXTURE RESIDUAL GAS FRACTION (f res )

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COMPOSITION OF UNBURNED MIXTURE RECIRCULATED EXHAUST GAS (EGR)

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COMPOSITION OF BURNED GAS FRACTION IN UNBURNED MIXTURE (at 1700 K)

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