Why do we keep speed of turbofan of turbofan jet engine, low.
And what is the maximum thrust a turbofan jet engine., how much can thrust a turbofan jet engine produce with just compressed air.
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The fan speed is kept low because the blades in it must not exceed the speed of sound during operation, otherwise the efficiency of the fan will go down and noise generation will go up.
I am not sure your second question is meaningful; all jet engines generate thrust by discharging a large mass flow rate of compressed air from their tailpipes. They compress that air by burning fuel and capturing some of the heat energy thus produced in a turbine which then spins the compressor.
niels nielsen
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