Aircraft Fuel Pump In Zero G

Well it's usually done by maintaining thrust either by solid fuel booster or thruster, with just a small amount of g-force the liquid fuel can be forced towards the pump....Without any force, sitting in zero-g, the fuel will just form a blob in a random location.....so some force must be used to push or pull the fuel to the pump....

http://en.wikipedia.org/wiki/Pressure_carburetor

Aircraft which operate in the atmosphere, close to the earth are rarely operating in zero G.

They use a flexible fuel pickup which is constantly in contact with the fuel, no matter the attitude of the aircraft. INVERTED PICKUP TUBES / FLOP TUBES from Aircraft Spruce

As the name implies aircraft operate in "air".

Spacecraft operate in zero G.

What do you really want?

They use an ullage motor. It's a small motor that provides a tiny amout of acceleration, which is just enough to force the liquid fuel toward the line that feeds the pumps.

Does zero gravity apply in a liquid as it does in the atmosphere? Divers experience near zero gravity due to buoyancy effects when submerged.

In true zero g conditions the only force holding the fluid together is surface tension. I'm not sure what fuel you are using but the surface tension of petrol/gasoline is lower than that of water. With even the slightest perturbation the contact with the pump may be lost. I suggest that your fuel be contained in a flexible bag within the tank and that the tank then be pressurised slightly. You will then have no problem with the fuel pump.

Zero g does present the contact with pump issue, but also the pump must provide a differential suction pressure when the impeller is loaded at the output (to line pressure) so that the flexible bag will indeed collapse, thereby driving the liquid to stay in contact with the pump suction. There is no zero g in the pump cavity, since the fluid is being accelerated to the discharge. As long as there is a differential pressure leading to the suction of the pump, my point is that there is not truly zero g there either, since there is an acceleration to the pump suction. I do not unnecessarily extend this acceleration throughout the fuel tank, if there is no collapsible membrane to prevent fuel-air contact.

This is all nonsense, because the AP has not given contradictory information on which to act.

The fuel considered is JP8 with the surface tension of . In military aircrafts, 0 g conditions are usual. Without having a collapsible member, can the centrifugal pump be able to suck fuel to its inlet?

Zero G conditions are NOT usual in military aircraft.

Nor any type of aircraft.