The relationship between tunnel fan speed and air volume
The amount of air in a tunnel fan reflects the ventilation and cooling capacity of the tunnel fan. We understand the relationship between the rotation of the tunnel fan and the volume of air.
When a tunnel fan works, the tunnel fan blades rotate, the type and quantity of air changes and the speed varies.
We can experiment with two tunnel fans adjusting the rotation speed of both tunnel fans low pressure tunnel fan rotation speed and low pressure tunnel fan rotation speed, pressure mounted on the vent and run in the same way to observe the air capacity. The rotation of the tunnel fans is not objective and the main factors affecting the air volume of the tunnel fans are necessarily interrelated.
The undeniable positive ratio between the air speed of the tunnel fan and the speed of movement of these factors is related to the knowledge and control of the increase in the air flow of the tunnel fan. Prerequisites for the control of the air volume of tunnel fans.
Noise reduction methods
According to the analysis, the fan noise source is basically a dipole. The total noise level of a tunnel fan is six times the speed of its rotation. The pale in addition, it can be inferred that the noise is due to the action of the blades on the air pulse power. Fans can be thought of as having two low frequency noise sources, the blade motion pressure field and the spiral noise caused by the dynamic noise of the blade pulses the distance between the static blades of the inflatable tyre and the moving blades is an important factor in the generation of interference noise.
The blades can also be used as an acoustic barrier to increase the acoustic radiation generated by the lifting pulse at very long distances. The effect of the length depends on the ratio of the wavelength associated with the lifting pulse to the size of the blade used as a lifting pulse. The resulting change in radiation intensity in Barrier II is an extremely large change in the frequency range greater than 1. The effect is therefore greater when the number of upstream and downstream vanes of the radiated noise vanes is the same and when both rows of vanes collide with the radiated noise vanes at the same time. Rotor blades, which can form a sound barrier on either side of the sound source.
With increasing static and moving sheet spacing, the effect of current interference is much faster than the effect of wake flow velocity. Whereas the effect of the blades as a sound barrier decreases with time the spacing can be seen to affect the interference noise by at least three parameters: the waveform of the velocity field the alignment distance of the blades blades and the small distance of the radiating surface sound of the blades can have two effects acoustically if the force pulse generated by the stator interference field makes the rotor the sound source, the stator is the acoustic barrier.