During the operation of an aircraft engine, the pressure drop in the carburetor venturi depends primarily upon what?

The pressure drop in the carburetor venturi is closely related to air velocity. The venturi effect is based on the principle of fluid dynamics, where a fluid's velocity increases as it passes through a constricted section of a pipe or channel, leading to a decrease in pressure. As the airflow volume increases, the air moves faster through the narrower section of the venturi, resulting in greater airflow velocity. This increase in velocity causes a significant drop in pressure according to Bernoulli's principle, which states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.

Understanding this relationship is crucial for fuel metering in aircraft engines because the amount of fuel drawn into the airstream is influenced by the pressure differential created in the venturi. In essence, the performance and efficiency of the engine can be optimized by managing air velocity and pressure drop within the carburetor. Therefore, air velocity is the primary factor influencing the pressure drop in the carburetor venturi.