Aircraft Fuel Booster Pump - Centrifugal & Immersed in Fuel

In summary, the correct way to put limitations on different aircraft flying conditions with respect to the cavitation point of view of the fuel booster pump is to ensure that the minimum pressure required at the suction side of the pump to avoid cavitation increases as the flow rate increases. This means that the maximum possible flow rate for a particular altitude must be fixed. It is important to note that this limitation should be based on the atmospheric pressure exerted on the fuel surface, not just the fuel column available above the inlet of the pump, as the fuel column level will vary according to the consumption rate. This approach is in accordance with FAR Part 25.955, which states that each fuel system must provide at least 100% of the required fuel flow
  • #1
mrajkumar
11
0
What is the correct way to put limitation on different aircraft flying conditions with respect to the cavitation point of view of the Fuel booster pump in the aircraft? The pump is immersed in the fuel and the fuel tank is vented to atmosphere(in atmospheric pressure, which will change with altitude)

From my understanding, as the flow rate increases the minimum pressure required at the suction side of the pump to avoid cavitation will increase. So, To specify the limitation like, "the maximum possible flow rate for a particular altitude will be fixed" is it correct?. Here I've taken only the atmospheric pressure exerted on the fuel surface, irrespective of the fuel column available above the inlet of the pump (since the fuel column level will vary according the consumption rate), or do we have to specify the limitation in terms of, "for particular fuel column available, the maximum flow rate possible will be fixed(taking the pressure because of fuel head also)".

Out of two approach which is the correct way to put limitation on flying conditions!

*(the fuel column measured is by gauging probe which is not exact always )
 
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  • #2
From FAR Part 25.955:
(a) Each fuel system must provide at least 100 percent of the fuel flow required under each intended operating condition and maneuver. Compliance must be shown as follows:
(1) Fuel must be delivered to each engine at a pressure within the limits specified in the engine type certificate.
(2) The quantity of fuel in the tank may not exceed the amount established as the unusable fuel supply for that tank under the requirements of §25.959 plus that necessary to show compliance with this section.
(3) Each main pump must be used that is necessary for each operating condition and attitude for which compliance with this section is shown, and the appropriate emergency pump must be substituted for each main pump so used.
Basically, what they are saying is the boost pump, if it is required to be operated, must provide full flow until the tank is empty. Besides the boost pump there is another pump on the engine and that is called the main pump in the regulations.

Here is a link to the regulations:

http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=8f2d082611715d23af524fed5ec3b5cf&rgn=div8&view=text&node=14:1.0.1.3.11.5.184.19&idno=14 [Broken]

To see how manufactures have designed their systems go to My Aircraft at this link and select type and fuel system:

http://www.smartcockpit.com/
 
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1. What is an Aircraft Fuel Booster Pump?

An Aircraft Fuel Booster Pump is a mechanical device used to increase the fuel pressure in the fuel system of an aircraft. It is designed to maintain a steady flow of fuel to the engine, ensuring optimal performance and safety during flight.

2. How does a Centrifugal Aircraft Fuel Booster Pump work?

A Centrifugal Aircraft Fuel Booster Pump uses a spinning impeller to create a centrifugal force that pressurizes the fuel and forces it to move through the pump and into the engine. The rotation of the impeller is powered by the aircraft's engine.

3. What makes an Immersed Aircraft Fuel Booster Pump different?

An Immersed Aircraft Fuel Booster Pump is submerged in the aircraft's fuel tank, whereas a centrifugal pump is typically located outside of the tank. This allows the immersed pump to be directly fed with fuel, eliminating the need for a suction line and reducing the risk of vapor lock.

4. What are the benefits of using an Aircraft Fuel Booster Pump?

The primary benefit of using an Aircraft Fuel Booster Pump is to ensure a steady flow of fuel to the engine, preventing engine failure or malfunctions. It also allows for more efficient fuel usage and can increase the range of the aircraft.

5. How often should I inspect and maintain my Aircraft Fuel Booster Pump?

The frequency of inspection and maintenance for an Aircraft Fuel Booster Pump will depend on the manufacturer's recommendations and the specific usage of the aircraft. However, it is generally recommended to inspect and service the pump at regular intervals to ensure its proper functioning and to prevent any potential issues during flight.

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