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When the valves are closed, they restrict the flow in the bypass stream to achieve low bypass for supersonic flight.
Most of the air, however, bypasses the core (hence the designation bypass stream) and goes directly to an exhaust nozzle.
A key parameter for classifying the turbofan is its bypass ratio, defined as the ratio of the mass flow rate of the bypass stream to the mass flow rate entering the core.
Variable-pitch fan blades are generally required for thrust reversal in such ultrahigh-bypass fans, while in medium- and high-bypass engines the thrust reversing is usually accomplished by introducing blocker doors into the bypass stream.
In addition, the weight and complexity of the apparatus required to reverse the direction of the bypass stream (to achieve thrust reversal in order to shorten the aircraft's landing roll) also increases with the bypass ratio.
The unburned fuel passes through the fan turbine and undergoes combustion in the ramjet burner when it mixes with the fresh air entering via the bypass stream from the fan.
Similar(49)
Gas flow that passed through the catalyst was measured to verify complete removal of VOCs from the gas steam and as a background with which to compare the bypass flow stream PTR-MS measurements.
In high- and medium-bypass turbofans (Figure 5), a small but significant improvement in propulsive efficiency can be achieved by mixing the airstream of the hot core and cold bypass streams before the total airstream enters a single jet nozzle.
In a modern turbo-fan engine, the afterburner flame-holders are positioned in the mixing flow between the core and bypass streams.
The wide use of material recycles and heat integration (with recycle and bypass streams) profoundly alters plantwide process dynamics and further increases their complexity.
Bypass streams were found to reduce the expected cake removal averaged over the corresponding cross-section of the hollow-fiber bundle.
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