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Convergent nozzles are used on many jet engines. If the nozzle pressure ratio is above the critical value (about 1.8:1) a convergent nozzle will choke, resulting in some of the expansion to atmospheric pressure taking place downstream of the throat (i.e., smallest flow area), in the jet wake. Although jet momentum still produces much of the ...
At take-off, the fan displaces up to 1.3 t (2,900 lb) of air per second, the jet nozzle velocity is almost 1,000 mph (450 m/s) and each high pressure turbine blade generates around 800 hp (600 kW), rotating at 12,500 rpm with their tips reaching 1,200 mph (540 m/s). [3] Rolls-Royce reports the engine is 10 dB quieter than the Trent 700. [15]
The Pratt & Whitney JT9D engine was the first high bypass ratio jet engine to power a wide-body airliner. [2] Its initial application was the Boeing 747-100 , the original "Jumbo Jet". It was Pratt & Whitney 's first high-bypass-ratio turbofan.
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The strength of the vacuum produced depends on the velocity and shape of the fluid jet and the shape of the constriction and mixing sections, but if a liquid is used as the working fluid, the strength of the vacuum produced is limited by the vapor pressure of the liquid (for water, 3.2 kPa or 0.46 psi or 32 mbar at 25 °C or 77 °F). If a gas ...