What is Motive Flow in an Aircraft Fuel System?

In summary, a motive flow in an aircraft fuel system is the flow of fuel that powers the fuel pump and allows for the transfer of fuel between tanks in order to reach the engines. It is a crucial component in the functioning of an aircraft and is regulated carefully to ensure proper operation.
  • #1
sureshav1
1
0
Hi,

Could someone explain what is a motive flow in the aircraft fuel system?

Thanks,
Suresh
 
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  • #2
Basically it uses fuel to pump fuel. We have a couple different types of motive flow pumps in my jet: ejector, and turbine. Ejector motive pumps use the venturi effect to transfer fuel, using high pressure motive flow
Ejector_or_Injector.png

Turbine type motive flow pumps use that same high pressure motive flow to drive a turbine which moves fuel from one tank to another.

In general, motive flow is used in fuel transfer between tanks in an aircraft. They are lightweight and relatively simple systems in comparison to using mechanically driven transfer pumps at all the tank interfaces. It is all the same fuel being used for engine feed, and motive flow, but fuel that isn't being consumed is regularly cycled through the motive flow circuit, and then back into the tanks.
 
  • #3


Sure, I'd be happy to explain! A motive flow in an aircraft fuel system is the flow of fuel that is used to power the fuel pump. This flow of fuel creates pressure that is needed to move the fuel from the tanks to the engines. Without a motive flow, the fuel would not be able to reach the engines and the aircraft would not be able to fly. It is an essential component of the fuel system and is carefully regulated to ensure proper functioning of the aircraft. I hope this helps to clarify things for you, Suresh. Let me know if you have any other questions!
 

1. What is motive flow in an aircraft fuel system?

Motive flow refers to the continuous flow of fuel from the aircraft's fuel tank to the engine. It is the force that pushes the fuel through the fuel system and into the engine for combustion.

2. Why is motive flow important in an aircraft fuel system?

Motive flow is crucial for the proper functioning of an aircraft's fuel system. It ensures a steady supply of fuel to the engine, which is necessary for the aircraft to maintain its desired speed and altitude during flight.

3. How is motive flow created in an aircraft fuel system?

Motive flow is created by the pressure difference between the fuel tank and the engine. This pressure difference is maintained by the fuel pumps, which generate low pressure at the fuel tank and high pressure at the engine.

4. What factors can affect motive flow in an aircraft fuel system?

Several factors can affect motive flow in an aircraft fuel system, including altitude, air temperature, and engine power. Higher altitudes and lower temperatures can decrease motive flow, while increased engine power can increase it.

5. What happens if there is a loss of motive flow in an aircraft fuel system?

If there is a loss of motive flow, the engine may not receive enough fuel to sustain its operation, leading to engine failure. This can be a serious safety concern and can result in an emergency landing. Therefore, proper maintenance and monitoring of motive flow are essential for the safe operation of an aircraft.

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