Description: Slide 1: GAS POWER CYCLES
Slide 2: THE CARNOT CYCLE AND ITS VALUE IN ENGINEERING
Slide 3: The Carnot cycle can be executed in a closed
Slide 4: The Carnot cycle is the most efficient cycle that can be executed
Slide 5: The thermal efficiency of the Carnot cycle is a function of the sink and
Slide 6: [No Text Found]
Slide 7: AIR-STANDARD ASSUMPTIONS
Slide 8: Even though internal combustion engines operate on a mechanical
Slide 9: The actual gas power cycles are rather complex.

Slide 10: Another assumption that is often utilized to simplify the analysis even
Slide 11: AN OVERVIEW OF RECIPROCATING ENGINES
Slide 12: The diameter of the piston is called the bore.

Slide 13: Another term frequently used in conjunction with
Slide 14: Reciprocating engines are classified as:

Slide 15: OTTO CYCLE: THE IDEAL CYCLE FOR SPARK-
Slide 16: A schematic of each stroke as well as a P-v diagram for an actual four-
Slide 17: [No Text Found]
Slide 18: Initially, both the intake and the exhaust valves are closed, and the piston is at its
Slide 19: At the end of this stroke, the piston is at its lowest position (the completion of the
Slide 20: In two-stroke engines, all four functions described
Slide 21: The two-stroke engines are
Slide 22: The thermodynamic analysis of the actual four-
Slide 23: The execution of the Otto cycle in a piston–cylinder device together
Slide 24: The Otto cycle is executed in a closed system, and disregarding the
Slide 25: Then the thermal efficiency of the ideal Otto cycle under
Slide 26: Above equation shows that under the cold-
Slide 27: We can observe from Fig. 9–17 that the thermal
Slide 28: Autoignition in spark-ignition engines cannot be tolerated because it
Slide 29: Improvement of the thermal efficiency of gasoline engines by utilizing
Slide 30: Unable to use lead, the refiners developed other
Slide 31: The second parameter affecting the thermal
Slide 32: DIESEL CYCLE: THE IDEAL CYCLE FOR COMPRESSION-IGNITION ENGINES
Slide 33: In gasoline engines, a mixture of air and fuel is compressed during
Slide 34: Because of this longer duration, the
Slide 35: Otto Cycle
Slide 36: Noting that the Diesel cycle is executed in a piston–cylinder device,
Slide 37: We now define a new quantity, the cutoff ratio rc , as the ratio of the
Slide 38:

Slide 39: Remember, though, that diesel engines operate at much higher
Slide 40: BRAYTON CYCLE: THE IDEAL CYCLE FOR GAS-TURBINE ENGINES
Slide 41: Fresh air at ambient conditions is
Slide 42: The open gas-turbine cycle described
Slide 43: The ideal cycle that the working fluid
Slide 44: The T-s and P-v diagrams of an ideal Brayton cycle
Slide 45: Then the thermal efficiency of the ideal Brayton cycle under the cold-
Slide 46: Above equation shows that under
Slide 47: The highest temperature in the cycle
Slide 48: The air in gas turbines performs two important
Slide 49: The two major application areas of gas-
Slide 50: [No Text Found]
Slide 51: The majority of the Western world’s naval fleets
Slide 52: Many modern marine propulsion
Slide 53: In gas-turbine power plants, the ratio of the
Slide 54: THE BRAYTON CYCLE WITH REGENERATION
Slide 55: The thermal efficiency of the Brayton cycle
Slide 56: The highest temperature occurring
Slide 57: Assuming the regenerator to be well insulated and
Slide 58: When the cold-air-standard assumptions are utilized, it reduces to

Slide 59: Therefore, the use of a regenerator with a very high effectiveness
Slide 60: The thermal efficiency is plotted

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