Two Ducted Fans For More Thrust

  • Thread starter rembrandtgos
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In summary, the conversation discussed the possibility of using two separate ducted fans, each with its own motor, in a cylinder with a larger diameter at one end. The idea was to experiment with fan RPM and control thrust. However, the effectiveness of this setup would depend on the type of fans and the pressure ratio between them. A preliminary actuator disk theory analysis would be necessary to determine the potential impact of this design.
  • #1
rembrandtgos
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If you have a cylinder with a slightly larger diameter at one end (the intake end) Would having one ducted fan powered by it's own motor at intake end and a second ducted fan powered by it's own motor at the exhaust end produce more thrust? It seems like the already accelerated air coming from the intake fan would be "super accelerated" by the exhaust ducted fan? I purposely stated using two fans for reasons of experimenting/controlling fan RPMs separately and also my final design may not be a straight cylinder. The diameter of fans would probably need to be at least 12 inches for the power I'd need. Any suggestions by folks with real experience with larger ducted fans would greatly be appreciated.
 
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  • #2
It depends on the the fans and duct. If the fans are fixed-speed axial and the pressure drop is low, there won't be much of an impact.
 
  • #3
One thing you need to know, as was stated earlier, is the pressure ratio of the two fans. You can perform a preliminary actuator disk theory analysis
 

1. How do two ducted fans provide more thrust compared to one fan?

Two ducted fans provide more thrust by increasing the total amount of air that is being moved. When two fans are used, each fan can operate at a lower speed, reducing the drag and increasing the efficiency of the system. This results in a higher overall thrust compared to a single fan operating at a higher speed.

2. What is the benefit of using two ducted fans instead of one?

The main benefit of using two ducted fans is an increase in thrust without a significant increase in power consumption. This can lead to increased performance and efficiency in applications such as drones, aircraft, and air conditioning systems.

3. Can two ducted fans be used for vertical takeoff and landing (VTOL) applications?

Yes, two ducted fans can be used for VTOL applications. The two fans can be oriented in opposite directions, allowing for the efficient production of thrust in both upward and downward directions. This is commonly seen in quadcopter drones, which use four ducted fans for VTOL capabilities.

4. Are there any disadvantages to using two ducted fans instead of one?

One potential disadvantage of using two ducted fans is the increased complexity and cost of the system. Having two fans may also require more space and add weight to the overall design. Additionally, if one fan fails, it can significantly impact the performance of the system.

5. How are two ducted fans controlled and synchronized?

In most cases, two ducted fans are controlled and synchronized through a central control system. This system uses sensors and algorithms to monitor and adjust the speed and direction of each fan to achieve the desired thrust and stability. In some cases, the fans may be independently controlled, allowing for more precise adjustments and control.

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