Adding a nacelle in front or behind the fan?

In summary, the addition of a nacelle to a standard pedestal fan can affect the speed of the air coming in and out. Using Q=AV, with Q being constant because of the fan blade's max speed, restricting the airflow can increase its velocity. However, this may not be beneficial for all types of cooling needs and there may be a limit to this relationship.
  • #1
boeing186
Can adding a nacelle in front or behind a standard pedestal fan affect the speed of the air coming in and out? If so, which is more beneficial: an intake nacelle or a nacelle in the front?

Using Q=AV, with Q being constant because of the fan blade's max speed, can affecting the area (A) create a noticeable difference in velocity (V)?
 
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  • #2
boeing186 said:
Can adding a nacelle in front or behind a standard pedestal fan affect the speed of the air coming in and out? If so, which is more beneficial: an intake nacelle or a nacelle in the front?

Using Q=AV, with Q being constant because of the fan blade's max speed, can affecting the area (A) create a noticeable difference in velocity (V)?
Welcome to PF!

It is difficult to know for sure and depends on exactly what you want to do with the fan. The general answer is yes, but there is a cost. Any restriction added to the fan will reduce the fan's airflow. So if you are OK with reducing the airflow to increase it's velocity, you can do that.
 
  • #3
russ_watters said:
Welcome to PF!

It is difficult to know for sure and depends on exactly what you want to do with the fan. The general answer is yes, but there is a cost. Any restriction added to the fan will reduce the fan's airflow. So if you are OK with reducing the airflow to increase it's velocity, you can do that.

Thanks! And I see. So in fans used for cooling, is a decrease in airflow but an increase in velocity more beneficial than the other way around? And if so, is there a limit to this or an equation that I can use to find such a relationship?
 
  • #4
boeing186 said:
Thanks! And I see. So in fans used for cooling, is a decrease in airflow but an increase in velocity more beneficial than the other way around? And if so, is there a limit to this or an equation that I can use to find such a relationship?
That would depend on the type of cooling being done.
 
  • #5
russ_watters said:
That would depend on the type of cooling being done.

Sounds kinda stupid, but cooling myself up to two yards away
 

What is a nacelle?

A nacelle is a streamlined enclosure that houses equipment and machinery, such as an engine or generator. In the context of aviation, a nacelle is the structure that surrounds and supports the aircraft's engine.

Why would you add a nacelle in front or behind the fan?

Adding a nacelle in front or behind the fan can improve the aerodynamics of an aircraft and reduce drag. It can also provide space for additional equipment or allow for a larger engine to be installed.

What are the potential benefits of adding a nacelle?

The potential benefits of adding a nacelle include increased fuel efficiency, improved performance, and increased payload capacity. The nacelle can also provide better protection for the engine and other equipment.

What are the potential drawbacks of adding a nacelle?

Some potential drawbacks of adding a nacelle include increased weight and cost, as well as potential changes to the aircraft's center of gravity and balance. The nacelle can also create additional maintenance and repair challenges.

How does the placement of the nacelle affect aircraft performance?

The placement of the nacelle can significantly impact the performance of an aircraft. Adding a nacelle in front of the fan can improve the efficiency and stability of the aircraft, while adding a nacelle behind the fan can increase the aircraft's speed and power. However, the placement must be carefully considered to avoid negative effects on the aircraft's balance and handling.

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