Thermodynamics Notes 25

Thermodynamics - ME 311 FALL 2007 CHAPTER 9(conclusion GAS POWER SYSTEMS THERMODYNAMICS S Masutani Familiar examples gas turbine power plants

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ME 311 THERMODYNAMICS S. Masutani FALL 2007 CHAPTER 9 (conclusion) GAS POWER SYSTEMS Familiar examples: gas turbine power plants; automobile, truck, locomotive engines; ramjets and aircraft propulsion systems. Internal Combustion Engines: Refers to reciprocating engines; characterized by piston-cylinder arrangement used to transform straight-line expansion/compression action to rotation. Two primary types: i. spark-ignition ii. compression-ignition Spark ignition: fuel and oxidizer ignited by a spark (plasma). Compression ignition: mixture of reactants compressed to very high pressures and temperatures; ignition occurs spontaneously. Typical spark-ignition engine Bore = diameter Piston BORE TDC BDC STROKE Stroke = length piston moves Clearance volume = minimum volume Displacement volume = volume swept by piston Compression ratio = volume at BDC/volume at TDC 1

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ME 311 THERMODYNAMICS S. Masutani FALL 2007 2 ote N = = = = 2 1 2 1 V V V V pdV dt d W pdV W pdV x d F W r r δ Typically P W Four-stroke 1 power stroke/2 revolutions s wo-st kes n -v diagram for a 4-stroke IC engine 4 distinct strokes/2 revolution T ro 1 power stroke/revolution 2 distinct strokes/revolutio p P V TDC BDC power compression intake intake valve closes exhaust valve opens exhaust valve closes stroke engine 4 1. Intake – draw in fresh charge ressed; V ; p and T pid increase in p and T. High 4. alve opens; expanding products of 2. Compression – charge is comp 3. Power – exothermic chemical reaction occurs with ra pressure gases expand and do work on the piston Exhaust – near the end of power stroke, exhaust v combustion exit system; purge is completed as piston moves from BDC to TDC.
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This note was uploaded on 05/19/2008 for the course ME 311 taught by Professor Masutani during the Fall '07 term at Hawaii.

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Thermodynamics - ME 311 FALL 2007 CHAPTER 9(conclusion GAS POWER SYSTEMS THERMODYNAMICS S Masutani Familiar examples gas turbine power plants

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