Brayton – Cycle Analysis, Performance and Comparison

What is the main principle behind the thermodynamics of the Brayton Cycle?

• Entropy always increases

• Conservation of mass

• Conservation of energy

• Second law of thermodynamics

How is the efficiency of the Brayton Cycle calculated?

• Efficiency = 1 - (1 / compression ratio)^((gamma-1)/gamma)

• Efficiency = 1 - (compression ratio)^((gamma-1)/gamma)

• Efficiency = 1 - (1 / compression ratio)^((gamma-1)*gamma)

• Efficiency = 1 - (1 / compression ratio)^((gamma+1)/gamma)

Name one performance parameter used to evaluate the Brayton Cycle.

• Thermal efficiency

• Inlet temperature

• Pressure ratio

• Specific work output

What are the key differences between an ideal and an actual Brayton Cycle?

• The key differences are: 1. Isentropic vs. irreversible compression and expansion processes. 2. No pressure losses vs. pressure drops in compressor and turbine. 3. Higher thermal efficiency in ideal cycle.

• Lower thermal efficiency in ideal cycle

• No heat addition vs. heat addition in combustion chamber

• Adiabatic vs. isothermal compression and expansion processes

Explain why the Brayton Cycle is commonly used in gas turbine engines.

• The Brayton Cycle is commonly used in gas turbine engines because it is environmentally friendly.

• The Brayton Cycle is commonly used in gas turbine engines due to its low efficiency and power output.

• The Brayton Cycle is commonly used in gas turbine engines due to its high efficiency and power output.

• The Brayton Cycle is commonly used in gas turbine engines because it is cheap to implement.