ABSTRACT
According to the Proportion Law of ventilator in hydrodynamics, the air flow in the wind tunnel and the ventilator speed is in direct proportion, so is the air speed of any point and the wind speed, for the cross-section of any point in the wind tunnel is constant. And the Verification of speed can be fast and accurate. Whereas the above analysis, the corresponding relation equation of them can be built up with determination of the air speeds to different ventilator speeds, improving the pitot tube & micromanometer method, which is process-complicated and time-consuming with greater error in lower air velocity, into a method of calculating air velocity with determination of the ventilator speed, called the air velocity Equivalent weight method.
