Centrifugal Fan - Backward Inclined Type

Centrifugal compressor - Wikipedia, the free encyclopedia

In a rotating wheel the air will move ONLY in centrifugal direction ! It CANNOT have a centripetal movement. So ALL centrifugal fans or compressors aspire at the shaft level and expel at periphery which ever direction you rotate the wheel and which ever direction the vanes are bend for or backwards. The only difference will be the efficiency since if it was designed for a rotating direction and it is used in the opposite the efficiency is not the same but a low lower.

Not quite; A backward curved impeller will produce more pressure at less volume. A forward curve will produce more volume at less pressure. A 'paddle' is deemed the median performance. A biased 'S' curve is a common 'hybrid' improvement.

can u help to find out the mass flow of air taken by a fan with blade angle.? the fan type is axial-centrifugal backward inclined with conical back plate.

Are you sure it's for air?

Water Jet drives have a conical/centrifugal impeller.

How about you post a picture of whatever it is you have?

yes it is for air only., this fan is used to dissipate the heat produced in the alternator . it sucks the atmospheric air through coin winding.

yes it is for air only., this fan is used to dissipate the heat produced in the alternator . it sucks the atmospheric air through coil winding.

If the fan was manufactured you get from the manufacturer a graph flow/pressure difference. You simply measure the pressure difference and get the flow. You do not need to calculate.

sorrry sir, actually i want that calculation for compare the practical and theoretical way,. its required for my final year project work.

OK then the best you can do since the computation requires a lot of fluid dynamics back ground is to take, as I already suggested, a good book and study how this has to be done. After you master the equations then you make a trial and communicate to CR4 your equations and your results and of course one of us will check it and make positive comments. At CR4 we have the basic rule NOT to make the work of students since it does not help them at same time we are willing to help when difficulties appear. For the analysis of your results it will be necessary to give as well all dimensions of the fan (rotor and stator) and rpm at which you made the measurements you intend to compare with theoretical values.

Hallo,

Another interesting thing is that the tip velocity is high in case of backward curved vane than that of forward or radial vane. Due to this reason backward curved vane impeller is used to handle dust or corrossive material laden gas/air with high effeciency in low RPM. Forward or radial vane impeller commonly used to handle clean air or gas and speed is high.

That is backward "inclined", not "implied". Here's some info on inline centrifugal fans by Greenheck: http://www.greenheck.com/products/detail/90

Hartzell makes the also:

In steel: http://www.hartzellfan.com/process-ventilation-equipment/steel-in-line-centrifugals/

Or Fiberglass: http://www.hartzellfan.com/corrosion-resistant-fiberglass-equipment/frp-in-line-centrifugals/

You might google Buffalo fan company, or Buffalo Forge Fan company, or New York Blower, or ACME Fan Company, or Big Ass Fan Company, etc, etc, etc.