Contents
Why does fuel flow decrease with altitude?
Fuel flow decreases as air density decreases. The engine becomes more efficient because of the greater temperature differential between inlet and exhaust gases combined with the lower fuel flow. Altitude increases – Air density reduces – Mass flosw reduces – Maximum thrust reduces.
What does a combustor do in an engine?
Combustion Chambers for Airbreathing Engines Combustors convert the chemical energy of the fuel, represented by the heating value, Qf, into thermal energy, represented by the stagnation temperature Tt. Part of the thermal energy is transformed into mechanical work by the turbine and used to drive the compressor.
How does a jet engine work at higher altitudes?
Jet engines have the ability to compress air and increase its pressure. This increases the mass flow rate through the engine enabling it to produce thrust at higher altitudes. This is achived by a compressor. In modern aircraft, there are 2 or 3 compressor stages that runs at different speeds giving the air different levels of pressure.
How does a jet engine increase its thrust?
Jet engines have the ability to compress air and increase its pressure. This increases the mass flow rate through the engine enabling it to produce thrust at higher altitudes.
How does low air pressure affect a jet engine?
Thus while moving forward with sufficient airspeed, the effect of low air pressure can be minimised. Jet engines, unlike piston engines has their combustion chamber open at both ends for fresh air entry and exhaust exit. The intake-compress-combust- exhaust flow thus is continuous in a jet engine.
How are jet engines different from piston engines?
Jet engines, unlike piston engines has their combustion chamber open at both ends for fresh air entry and exhaust exit. The intake-compress-combust- exhaust flow thus is continuous in a jet engine. Also the air inlet of the engine faces the direction of flight so that forward motion of engine creates pressure (Ram air) at the inlet.