The relationship between fan impeller and fan
The relationship between fan impeller and fan
Jan 26, 2016
The relationship between fan impeller and fan
As we all know, regardless of what kind of type wind turbine in the use of the process if without blade , so the wind quantity and the effect of wind machine can not be reflected, so its role for the fan is very obvious, but is is not to say that impeller blade will not be to the user to bring other problems, regardless of what things have two sides of impeller blade brought the effect at the same time to the user, have certain effects on the wind machine, for example: fan noise, fan noise is a most are derived from the fan blade.Wind turbine blade why have so much noise? We introduce the user through the following aspects. High pressure fan blade rotation will produce friction with the air or the impact. When the blade rotates, it will generate friction with the air, or the impact will occur. The faster the speed, the higher the frequency of air solutions, have more sharp noise. This phenomenon is more obvious with the increase of the width or thickness of the blade. The width or thickness of the blade for the high pressure fan is increased, and the phenomenon is more obvious. The frequency of the noise is compounded by a variety of frequencies, which are related to the speed of the fan.
In the fan impeller blade entrance or exit with turbulent device (metal mesh) can make blades abaxially laminar boundary layer immediately converted into a turbulent boundary layer and delay the separation of boundary layer on the back of the blade, even without separation, the trailing edge of the blades mounted on the Internet, the network of gas flow velocity and pressure gradient can quickly become uniform, if the net in the vortex region can greatly reduced the vortex area, thus to further reduce the noise problem.
Found the blade causes of noise, we can find the solution according to the reasons, usually most users will using the perforated blades method to achieve the purpose of reducing noise. Because the blade outlet vortex separation, and the blade perforation method can make the airflow from the blade pressure side of the blade pressure surface, can promote the separation point of the blade to flow downward movement and its mechanism equivalent to boundary layer blowing. This method is relatively simple, we can also find other method to solve the problem, in short as long as we can solve the problem of fan blades noise and does not affect the use effect of the wind machine, are worthy of user try to use.
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