What occurs in the combustion chamber regarding the airflow?

• A. Air is compressed
• B. Fuel/air mixture is ignited
• C. Air is converted into static pressure
• D. Air is pressurized

Answer: (B)

In the combustion chamber, the primary occurrence is the ignition of the fuel/air mixture. When the engine is operating, air is drawn into the combustion chamber where it combines with fuel to form a combustible mixture. This mixture is then ignited, resulting in a rapid expansion of gases that provide the necessary thrust or power in an engine, whether in a helicopter or another type of aircraft.

The ignition process is critical for the functioning of the engine, as it initiates the combustion cycle that ultimately drives the engine's performance. Understanding this process is essential for grasping how engines convert fuel into mechanical energy, and it highlights the importance of achieving the correct fuel/air ratio for efficient combustion.

In contrast to the ignition process, the other options refer to aspects of air dynamics and engine operation that are not directly related to what occurs inside the combustion chamber during the ignition event.