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Double fan/propeller in same axial efficiency?

If we put a "free/craze" fan behind of the same but powered fan which produce air frontwards,what happened at the powered fan (volume and speed of outlet air) in the case of same rpm compared to when it was spinning without the second-unpowered fan (same rpm)....(both fans "look" frontward)

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  • 1 month ago

    If I understand what you are saying correctly i believe tha second free wheeling fan will just sap power from the system lowering the efficiency.

    •  we are not interested in (examine for) the power absorption of the system but for the volume and speed of the produced air

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  • 1 month ago

    You will get less air than if you just used one fan.

    • Do you know any physical law (aerodynamics) which prove that?we are not interested in (examine for) the power absorption of the system (axial motor power) but for the volume and speed of the produced air......someone tell me that system is the  principle of operation of the torque converter 

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