Fan power for 3x3m wind tunnel?
200 km/h = 55,6 m/s
The density of air is taken as 1,23 kg/m3
You have a mass flow rate of 55,6 x 3 x 3 x 1,23 = 615 kg/s
In other words, in every second, you're moving a mass of air of 615 kg. The kinetic energy of that moving mass is 0,5 x 615 x 55,6^2 = 951 kilojoule. In a second, that's 951 kilowatt.
A lot of power, and that, assuming your fan has an efficiency of 100% and friction losses are zero...