HIGH-BYPASS TURBOFAN · CUTAWAY

Twin-spool · Annular combustor · Section through engine centreline

HOW COMBUSTION WORKS

  1. Compression — the HP compressor delivers air at ~40× ambient pressure and ~600 °C into the diffuser, which slows it for stable burning.
  2. Fuel injection — nozzles spray atomised kerosene; swirlers spin the incoming air to anchor the flame.
  3. Primary zone — a recirculating vortex burns the mixture at ~2000 °C, far above what the liner could survive.
  4. Dilution & cooling — air jets through liner holes and a cooling film trim gas to ~1500 °C before the HP turbine.
  5. Expansion — hot gas spins the turbines that drive the fan and compressors, then exits the nozzle as thrust.

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