Help required in design of a fan

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Discussion Overview

The discussion revolves around the design of a fan intended to push air downward with considerable pressure. Participants are exploring the appropriate blade profile for a horizontally positioned fan, debating the applicability of traditional airfoil designs used in aviation.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests that a lift wing blade profile may not be suitable for a fan designed to push air down.
  • Another participant counters that wing profiles can function effectively when inverted, implying that traditional airfoil designs could still be applicable.
  • A question is raised about whether a standard airfoil design could indeed push air down when attached to a motor, indicating uncertainty about the effectiveness of this approach.
  • Clarification is provided that while an airplane wing can work upside down, the camber of the blade must be inverted to achieve the desired airflow direction.

Areas of Agreement / Disagreement

Participants express differing views on the suitability of airfoil designs for the fan blades, indicating that multiple competing perspectives remain unresolved regarding the optimal blade profile.

Contextual Notes

Participants have not fully explored the implications of camber adjustments or the specific design parameters necessary for achieving the desired airflow and pressure.

okaakshay
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Hello,
I and my team are making a project in which we have to build a fan which ,when run , will push air down and with some considerable pressure. The Fan will be positioned horizontally. What should be the Blade Profile for such a fan ?? I do not think a lift wing blade profile could be useful because here the Fan has to push air down . ANY SUGGESTIONS ?
 
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okaakshay said:
I do not think a lift wing blade profile could be useful bcoz here the Fan has to push air down.
Wing profiles work just as well upside down.
 
So do you mean that I can design the Blades of the fan in a normal airfoil design that a plane wing has and that it will push air down with sum pressure when i attach it to a motor... ??
 
Last edited by a moderator:
okaakshay said:
So do u mean that I can design the Blades of the fan in a normal airfoil design that a plane wing has and that it will push air down with sum pressure when i attach it to a motor... ??

Certainly. Why would you think an airplane wing would only work right side up?

You realize that the camber has to be upside down though, right?
 

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