How can I calculate the flow rate created by a fan connected to an engine?

AI Thread Summary
To calculate the flow rate created by a fan connected to an engine, one must understand that there is no simple equation due to the complexity of the system. The relationship between fan speed and flow rate is influenced by various factors, including the fan's performance curve. It's essential to gather specific details about the fan and system to derive accurate calculations. For practical insights, examining performance data from similar devices, like vacuum cleaner fans, can be beneficial. Accurate flow rate calculations require a comprehensive understanding of the fan's characteristics and operating conditions.
pigwiddeon
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Hello

I am trying to design a vacuum using venturi. I cannot quite get the air flow created by the rotation of the fan, which is connected to the engine.

How is the relation between the fan speed and the flow rate created by it?

I know the proportionalities between the speed, power and the flow rate etc. But I need a solid equation which I can use to calculate exact number of the flow rate.

Thanks in advance for your answers
 
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Welcome to PF!

Ironically, last night we got exactly the same question about a different fan/flow situation. The answer is that there is no simple equation. You need to know the details of the system and you need the fan performance curve. I'd look at actual vacuum cleaner fans for typical performance information.

Thread moved to mechanical engineering section.
 
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