Air Turbine Design -- advice regarding a Hall sensor type air flow meter

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Hello all,

I am after some advice regarding a hall sensor type air flow meter.

I know from experience that most hall sensor flow meters allow a bypass of fluid around the turbine/fan. However I would like to know what would happen if this was the case of the design below.

Specifications;
Inlet air velocity 0-11.5ms-1
Inlet ID 1.5mm
Turbine diameter: 5mm
Air gap between turbine and housing: 0.1mm

I assume two things will happen,
1.) the turbine itself will impede intake air velocity and eventually reach zero.
and/or 2.) the turbine will rotate too fast and the turbulence created inside the housing will in turn impede intake air.

I will attach calculations shortly.


Thanks in advance.


8LWfsle.png
 

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