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QUESTIONS

QUESTIONS. Model cycles. Otto – SIIC – gasoline engine Diesel – CIIC – diesel engine Dual –IC Brayton – gas turbine & jet engine. Brayton cycle. Gas power Uses Auxiliary power generation Stand-alone power generation Naval propulsion Jet engine. Brayton cycle.

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QUESTIONS

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  1. QUESTIONS

  2. Model cycles • Otto – SIIC – gasoline engine • Diesel – CIIC – diesel engine • Dual –IC • Brayton – gas turbine & jet engine

  3. Brayton cycle • Gas power • Uses • Auxiliary power generation • Stand-alone power generation • Naval propulsion • Jet engine

  4. Brayton cycle • 1→2 Isentropic compression • 2→3 steady pressure heat addition • 3→4 isentropic expansion • 4→1 steady pressure heat rejection

  5. Brayton cycle • Working fluid – air • Ideal gas • High AFR – air as working fluid • Complete combustion • Temperature limits • Thermal reservoirs • Open or closed model • Steady pressure heat exchange

  6. Brayton cycle • Work in & work out • Heat in & heat out • Thermal efficiency • Pressure ratio • Back work ratio

  7. Brayton cycle • Variable specific heat – isentropic processes of ideal gas • Constant specific heats - k

  8. Cycles • Otto – r • Diesel – r & rc • Brayton -rp

  9. Example • The rate of heat addition to an air-standard Brayton cycle is 3.4X109 Btu/hr. The pressure ratio is 14; the minimum and maximum cycle temperatures are 520oR and 3000oR respectively. • Find the thermal efficiency, mass flow rate, and net power.

  10. Example • A gas turbine power plant opeating on an ideal Brayton Cycle has a pressure ratio of 8. Tha gas temperature is 300K at the compressor inlet and 1300K at the turbine inlet. Find the bwr and thermal efficiency of the cycle.

  11. Example • Use the preceding data and modify for an compressor isentropic efficiency of 80% and a turbine isentropic efficiency of 85%. How is the thermal efficiency affected?

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