Search results
Results From The WOW.Com Content Network
The type of jet engine used to explain the conversion of fuel into thrust is the ramjet.It is simpler than the turbojet which is, in turn, simpler than the turbofan.It is valid to use the ramjet example because the ramjet, turbojet and turbofan core all use the same principle to produce thrust which is to accelerate the air passing through them.
Jet airliners became 70% more fuel efficient between 1967 and 2007, [49] 40% due to improvements in engine efficiency and 30% from airframes. [50] Efficiency gains were larger early in the jet age than later, with a 55-67% gain from 1960 to 1980 and a 20-26% gain from 1980 to 2000. [45]
For example, Concorde cruised at 1354 mph, or 7.15 million feet per hour, with its engines giving an SFC of 1.195 lb/(lbf·h) (see below); this means the engines transferred 5.98 million foot pounds per pound of fuel (17.9 MJ/kg), equivalent to an SFC of 0.50 lb/(lbf·h) for a subsonic aircraft flying at 570 mph, which would be better than even ...
Aircraft engine performance refers to factors including thrust or shaft power for fuel consumed, weight, cost, outside dimensions and life. It includes meeting regulated environmental limits which apply to emissions of noise and chemical pollutants, and regulated safety aspects which require a design that can safely tolerate environmental hazards such as birds, rain, hail and icing conditions.
Rocket engines in vacuum; Model Type First run Application TSFC I sp (by weight) I sp (by mass); lb/lbf·h g/kN·s s m/s Avio P80: solid fuel: 2006: Vega stage 1 : 13 360 280 2700 Avio Zefiro 23
The Aircraft Engine Historical Society; Jet Engine Specification Database; Aircraft Engine Efficiency: Comparison of Counter-rotating and Axial Aircraft LP Turbines; The History of Aircraft Power Plants Briefly Reviewed : From the " 7 lb. per h.p" Days to the " 1 lb. per h.p" of To-day "The Quest for Power" a 1954 Flight article by Bill Gunston
The efficiency of turbojet engines was still rather worse than piston engines, but by the 1970s, with the advent of high-bypass turbofan jet engines (an innovation not foreseen by the early commentators such as Edgar Buckingham, at high speeds and high altitudes that seemed absurd to them), fuel efficiency was about the same as the best piston ...
Table for Jet and rocket engines: jet thrust is at sea level; Fuel density used in calculations: 0.803 kg/l; For the metric table, the T/W ratio is calculated by dividing the thrust by the product of the full fuel aircraft weight and the acceleration of gravity. J-10's engine rating is of AL-31FN.