In a can-annular arrangement, what is the purpose of placing individual chambers side by side within a single casing?

• A. To form a circle of cans inside a single casing, improving packing efficiency and cooling
• B. To create separate combustion zones that never interact
• C. To simplify maintenance by having a single large chamber
• D. To eliminate the need for ignitor plugs

Answer: (A)

In a can-annular arrangement, multiple small combustion chambers are placed side by side around the inside of a single outer casing, forming a circular ring. This layout maximizes how tightly the cans can be packed inside one casing, making the overall combustor more compact. It also improves cooling because the ring of cans shares the surrounding cooling air and distributes heat more evenly across the entire annulus.

So the main idea is forming a circle of individual cans inside one casing to boost packing efficiency and cooling performance. The other ideas don’t fit: the chambers don’t become completely isolated from each other, you don’t end up with one large chamber, and igniter plugs are still used in the system.