In a reverse flow annular combustion chamber, from where does air enter?

In a reverse flow annular combustion chamber, air enters from the rear of the chamber. This design allows the combustion gases to flow in the opposite direction to the incoming air, creating a more efficient heat exchange and better mixing of fuel and air. The reverse flow configuration helps minimize combustion chamber length, allowing for a more compact engine design.

By directing air intake from the rear, the combustion process benefits from a shorter path for the combustion gases as they exit toward the turbine, thus enhancing overall performance. This arrangement contrasts with other types of combustion chambers where air enters from different points, such as the front or sides, which do not facilitate the same flow dynamics and efficiency.