bypassratios
Bypass ratio is a characteristic of turbofan engines that describes how much air drawn in by the fan bypasses the engine core relative to the air that passes through the core. In a turbofan, the incoming air splits into bypass flow and core flow. The bypass flow is accelerated by the fan and provides most of the thrust in high-bypass engines, while the core flow passes into the compressor, combustor, and turbine to generate additional thrust.
The bypass ratio (BPR) is typically defined as BPR = m_dot_bypass / m_dot_core, where m_dot_bypass is the mass
Implications: Higher bypass ratios generally yield greater propulsive efficiency and lower specific fuel consumption at subsonic
Typical ranges: Modern civil turbofans commonly have BPR in the range of about 6 to 12, with
Variations: Bypass ratio can change with throttle, altitude, and engine design, and some modern engines employ