Combustion chambers in various types of jet engines.

 Combustion chambers in various types of jet engines.

Jet Engine Type	Combustion Chamber Type	Description	Materials Used	Advantages	Disadvantages
Turbojet	Can-type	Individual, separate combustion chambers (one per fuel nozzle).	Nickel-based superalloys (Inconel, Hastelloy), stainless steel.	Easy maintenance, modular design.	Heavier, bulkier, inefficient airflow.
Turbofan	Annular	A single continuous ring-shaped chamber surrounding the engine core.	Nickel-based alloys (Rene 41, Hastelloy X), ceramic coatings for heat resistance.	Efficient fuel-air mixing, compact, lighter.	More complex to manufacture, difficult to maintain.
Turboprop	Can-annular	A mix of can-type and annular designs: multiple cans inside an annular outer shell.	Cobalt-based superalloys (Haynes 188, Stellite), titanium alloys.	Good balance of efficiency and ease of maintenance.	More complex than annular, heavier than pure can-type.
Ramjet	Straight-through flow	Airflow directly passes through a simple chamber; no moving parts.	High-temperature ceramics, refractory metals (tantalum, tungsten).	Lightweight, simple design.	Only works at high speeds (Mach 0.5+), requires external launch.
Scramjet	Supersonic combustion	Similar to a ramjet, but fuel burns at supersonic speeds.	Ultra-high temperature ceramics (zirconia-based), titanium aluminides.	Operates at hypersonic speeds (Mach 5+).	Extremely complex, requires high-speed launch.
Afterburner (in Turbojet/Turbofan engines)	Afterburner Combustion	An additional combustion section after the turbine to increase thrust.	Heat-resistant nickel alloys (Inconel 718, Waspaloy), thermal barrier coatings.	Provides extra thrust when needed.	Very inefficient, high fuel consumption.

Material Selection Factors:

• High-Temperature Resistance: Jet engine combustion chambers reach 1,500–2,000°C (2,732–3,632°F). Superalloys and ceramics prevent thermal degradation.
• Oxidation & Corrosion Resistance: Nickel and cobalt-based alloys resist oxidation at high temperatures.
• Lightweight & Strength: Titanium alloys provide strength with lower weight in some applications.
• Thermal Barrier Coatings (TBCs): Ceramic coatings improve heat resistance, increasing engine longevity.