Fan design to improve lift force

In summary, the addition of a second set of fan blades on the same axis as the first set may improve lift force, as seen in lab trials. This concept has been applied in both airplanes and helicopters, but has been largely abandoned due to mechanical concerns and maintenance issues. The theory behind this phenomenon is that the relative wind on the second set of blades is different from that on the first set, and this can affect the vehicle's velocity. However, this remains a practical application in a lab setting and there are no specific equations associated with it.
  • #1
MiracleMax1
1
0

Homework Statement


Can the addition of a second set of fan blades, below the first set and on the same axis, improve the lift force created? What is the theory associated with this phenomena?


Homework Equations


none, practical application in lab setting.


The Attempt at a Solution


Lab trial seemed to support the concept but I have no basis for this.
 
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  • #2
There have been airplanes as well as helicopters with this motive force. You have to take into consideration that the relative wind on the lead rotor is extremely different for the second.

In the case of a helicopter, the leading edge of the rotor is then subject to the somewhat different original wind as the vehicle's velocity increases.

All such designs are history, probably due to mechanical considerations. More parts means more maintenance and more failures anyway.
 

1. How does the design of a fan affect lift force?

The design of a fan can greatly impact the lift force it produces. The angle and shape of the fan blades, as well as the size and speed of the fan, can all influence the amount of lift force generated.

2. Can changing the angle of the fan blades improve lift force?

Yes, changing the angle of the fan blades can significantly impact the lift force. A steeper angle can create more lift force, while a shallower angle may produce less but more efficient lift force.

3. How does the size of the fan affect lift force?

The size of the fan can also affect lift force. A larger fan can produce more lift force, but it may also require more power to operate. On the other hand, a smaller fan may generate less lift force but be more efficient.

4. What role does the speed of the fan play in lift force?

The speed of the fan is a critical factor in lift force. In general, a faster spinning fan will produce more lift force. However, there is a limit to how fast a fan can spin before it becomes inefficient and starts to produce less lift force.

5. Are there any other design factors that can improve lift force?

Aside from the angle, size, and speed of the fan, other design factors such as the shape and material of the fan blades can also impact lift force. Additionally, the placement and orientation of the fan can also affect how much lift force it produces.

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