Chapter 9

Chapter 9 - Chapter 9:Gas Power Cycles Objective: Evaluate...

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Chapter 9:Gas Power Cycles Objective: Evaluate performances of various gas power cycles
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Topics to be covered • Air-Standard Assumptions • Reciprocating Engines- Otto & Diesel • Stirling & Ericsson Cycles • Brayton cycle- Ideal cycle gas turbine engines - with Regeneration - with intercooling, reheating, regeneration • Ideal jet cycle
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Thermal efficiency and Carnot Cycle • Thermal efficiency: η th =W net /Q in • Carnot Cycle: η th = 1- T L /T H • Material limitations on T H
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Air-Standard Assumptions • 1- Working fluid is air which circulates in a closed loop and can be treated as an ideal gas. • 2- All processes are internally reversible. • 3- Combustion is replaced by a heat addition process from an external source. • 4- The heat exchange processes are modeled by an equivalent heat transfer process.
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Car Engines
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Photo of a 1.8 Liter Pontiac Engine in Hesse Hall
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Gasoline Direct Injection (GDI)Lean Burn Engines Advantages: -lean burn -Low (or no) pumping loss -High compression ratio -High efficiency Disadvantages: -hard to maintain good combustion -high NOx an HC emissions -special NOx absorption catalyst
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Overview of Reciprocating Engines exhaust intake
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Compression Ratio and MEP Compression Ratio: r=V max /V min =V BDC /V TDC Mean Effective Pressure (MEP) V max = V displacement +V clearance V min = V clearance
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Different Types of Reciprocating Engines Gasoline
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Chapter 9 - Chapter 9:Gas Power Cycles Objective: Evaluate...

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