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Gas Turbine

Gas Turbine

Made of

SteelIronAluminumCrude OilCopper

Brief description

A gas turbine (also called a combustion turbine) is a type of continuous-flow internal combustion engine. It converts the chemical energy of fuel into mechanical energy by using a stream of fast-moving combustion gases to rotate a turbine.

Use / Function

  • Aviation: Powering jet aircraft (Turbojets, Turbofans).
  • Power Generation: Driving large generators in power plants.
  • Marine Propulsion: Powering fast ferries and naval ships.
  • Industrial Drives: Powering large pumps and compressors.
  • Scale: From small auxiliary power units (APUs) to massive 500+ megawatt turbines.

Operating principle

The gas turbine operates on the Brayton cycle, which involves three main stages in a continuous flow:

  1. Compression: A rotary compressor draws in atmospheric air and compresses it to high pressure.
  2. Combustion: The compressed air is mixed with fuel and ignited in a combustion chamber. This produces a high-velocity, high-temperature gas stream.
  3. Expansion: The hot gases expand through a turbine, forcing it to rotate.
    • Some of this rotation powers the compressor (Step 1).
    • The remaining energy (useful work) can drive a shaft (Turboshaft) or provide thrust by exhausting the gases at high speed (Turbojet).

How to create it

Building a gas turbine is extremely difficult because it requires materials that can withstand high centrifugal forces and intense heat simultaneously:

  • Precision Blades: Turbine blades must be aerodynamically perfect and capable of operating at temperatures near their melting point.
  • High-Speed Bearings: Must support shafts rotating at tens of thousands of RPM.
  • Advanced Metallurgy: Requires specialized alloys (Superalloys) that maintain strength at red-hot temperatures.
  • Technical level: Extremely Advanced.

Materials needed

  • Essential materials:
    • Superalloys: Specialized Steel or nickel-based alloys for turbine blades.
    • Stainless Steel: For the housing and combustion chambers.
    • Aluminum: For the compressor sections (cooler parts).
    • Copper: For sensors and control systems.
  • Tools:

Variants and improvements

  • Turbojet: Pure jet engine where all energy comes from exhaust thrust.
  • Turbofan: A large fan at the front provides most of the thrust; much more efficient and quieter.
  • Turboprop: Uses the turbine to drive a propeller.
  • Combined Cycle: Using the hot exhaust from a gas turbine to boil water for a Steam Turbine, greatly increasing efficiency.

Limits and risks

  • Fuel Consumption: Can be very high, especially at low speeds or partial loads.
  • Heat Stress: Components eventually fail due to “creep” (stretching under heat and stress).
  • Foreign Object Damage (FOD): Inhaling a bird or stone can destroy the engine instantly.
  • Noise: Extremely loud without specialized suppression.