Calculation of the total pressure head of the blower
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According to the relationship graph between total head and flow rate, the vibration level of the blower reaches its minimum value after passing the peak of the parabola; at this point, total head and flow rate are inversely proportional to each other. In our factory, when the amount of gas drawn in by the blower decreases, the total head actually decreases as well, which contradicts the principles stated in textbooks. Why is this?
It depends on the performance curve of your fan; some fans have curves like that. The general case is what you mentioned, but each fan is different.
It also depends on how you control the flow rate of the gas; if a control valve is used for regulation, this is what will happen, as increasing resistance is necessary in order to reduce the flow rate
This is the truth. Hehe, when the speed decreases, both the air volume and air pressure will drop.
So, without reducing the speed, add the wind shield. As the wind pressure changes, the air volume must decrease!