🔍 Key Concepts

• Energy addition in Brayton (gas turbine) cycle – where heat is added to increase the fluid’s enthalpy • Difference between compressing air vs burning fuel in air • Role of turbines – where energy is extracted from the gas to drive compressors and produce shaft power

💭 Think About

• In which component does the working fluid experience the largest temperature rise due to heat from fuel rather than mechanical work? • Which part of the engine is specifically designed to add heat (chemical energy from fuel) instead of extracting it? • Think about the direction of energy flow: where is energy put into the gas vs where is energy taken out of the gas?

✅ Before You Answer

• Identify which component is responsible for mechanical compression (work done ON the fluid, but no direct fuel burning there). • Identify which components are turbines whose main job is to TAKE energy out of the high‑energy gas to turn shafts. • Focus on the part of the cycle where fuel is mixed and burned to raise the gas temperature and enthalpy before it expands through the turbines.