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3 votes
Accepted

What gives gas turbine/turbojet engines such high energy density?

Turbojets and turbofans support extremely large mass flow rates of air & fuel through them, relative to their weight. (The majority of the work performed by burning that fuel is taken up by ...
niels nielsen's user avatar
2 votes

Does air pressure difference of intake exhaust contribute to jet thrust?

The easiest way to view the problem is to draw a control volume around the engine that is big enough so that the air pressure is constant on the boundary surface of the control volume and the upstream ...
Phil Sweet's user avatar
  • 4,765
2 votes

Please explain engine thrust and aircraft weight

Unless an aircraft takes off vertically the thrust it needs is much less than its weight, roughly proportional to the sin of take-off angle. Or sometimes a plane can fly with zero trusts. such as on ...
kamran's user avatar
  • 22.5k
2 votes

Is it true that pre-jet air planes used to fly much lower? If so, why?

TL:DR 1. Yes, 2. Because of the differences in engine performance wrt flight speed. 3. You mostly can avoid weather at 35,000 feet. Airplanes potentially have better fuel efficiency at higher ...
Phil Sweet's user avatar
  • 4,765
1 vote
Accepted

Why are the rocket exhausts so different from rocket to rocket?

The side boosters in the first image are solid fuel rockets, which generate a lot of particles (soot and unburned fuel) in their exhaust plumes. These solid particles glow orange and white hot, ...
RC_23's user avatar
  • 781
1 vote

Do stators in axial flow compressors have airfoil geometry?

As @alephzero commented , the stator vanes look just like rotor blades. Both for gas turbine compressors and air compressors. Of coarse attachments and foil shapes are different.And so are the stator ...
blacksmith37's user avatar
  • 6,154
1 vote
Accepted

Effect of speed of turbo fan in bypass jet engine

The fan speed is kept low because the blades in it must not exceed the speed of sound during operation, otherwise the efficiency of the fan will go down and noise generation will go up. I am not ...
niels nielsen's user avatar

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