The bypass ratio is a critical parameter in aircraft engine design, but it’s not directly related to a mass flow rate formula. The bypass ratio is defined as the ratio of the mass of air passing through the bypass duct (the air that bypasses the engine core) to the mass of air passing through the engine core (the air that goes through the combustion process). It is often represented by the symbol “BPR.”
- – BPR is the bypass ratio, a unitless ratio.
- – Mass flow rate of bypass air refers to the mass of air passing through the bypass duct in a given time, typically measured in kilograms per second (kg/s).
- – Mass flow rate of core air refers to the mass of air passing through the engine core in a given time, also measured in kilograms per second (kg/s)