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Mechanical Fans: Understanding Fan Components and Functions

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Mechanical Fans: Understanding Fan Components and Functions

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Questions and Answers

What is the function of a fan?

To purify the air

To cool down the air

To create flow within a fluid (correct)

To generate electricity

Which type of fan has blades that force air to move parallel to the shaft about which the blades rotate?

Axial-flow fan (correct)

Cross flow fan

Centrifugal fan

Radial fan

What is the moving component of a centrifugal fan called?

Shaft

Blades

Impeller (correct)

Rotor

Which type of fan blows air at right angles to the intake of the fan?

Centrifugal fan Signup and view all the answers

What is typically used to power most fans?

Electrical motors Signup and view all the answers

What is the purpose of the housing or case in which a fan is contained?

To increase safety by preventing objects from contacting the fan blades Signup and view all the answers

What type of fan typically produces more pressure for a given air volume?

Centrifugal fan Signup and view all the answers

Which type of fan is usually long in relation to the diameter, so the flow approximately remains two-dimensional away from the ends?

Crossflow or tangential fan Signup and view all the answers

How is the stage work calculated according to Euler's Equation?

$W.D = u (Δcw)$ Signup and view all the answers

What is the stage pressure coefficient defined as?

$Ψ = (Δp)st / (1/2 ρu2)$ Signup and view all the answers

What does the degree of reaction for the fan stages define?

The ratio of static pressure rise in the rotor to stagnation pressure rise over the stage Signup and view all the answers

What is the fan efficiency defined as?

$f = (Δpo)st / ρ u (Δcw)$ Signup and view all the answers

How is the actual power input to the stage calculated?

$Actual Power = mo u (Δcw)$ Signup and view all the answers

In terms of what are the pressure difference across the fan stages generally measured?

$mm W.G.$ Signup and view all the answers

What is denoted as cy in the Text?

Whirl Velocity Component Signup and view all the answers