What is an advantage of an annular combustion chamber?

• A. Improved efficiency and flame propagation; compact design
• B. Increased cooling requirements
• C. Higher weight
• D. Reduced maintenance requirements

Answer: (A)

An annular combustion chamber uses a ring-shaped flame zone around the engine core, which leads to uniform combustion and a compact package. The flame front can propagate continuously around the circumference, so ignition and burning stabilize quickly, reducing hotspots and improving overall efficiency. The ring shape also shortens the axial length and allows tighter packaging, helping to lower size and weight compared with multiple separate burners. Cooling can be integrated around the annulus for effective heat removal without adding bulk. This combination of efficient, uniform burning and a compact configuration is the key advantage. Increased cooling requirements, higher weight, or reduced maintenance are not inherent benefits of this design.