Problems with constant head pumps (tangential pumps)
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Why do constant-head pumps maintain a constant head? Is the curve straight?
Theoretically, it is a straight line, but there are various losses; as the flow rate increases, the head decreases, and before this decrease occurs, it remains more or less a straight line
You can look for the curves of the Shengdaiyin high-speed pump or check page 369 of Teacher Guan Xingfan’s book \"Modern Pump Theory and Design\"
Teacher Guan’s book only explains how to design it, but it doesn’t explain why the curves are straight; I’m quite puzzled by this
Theoretically, a curve with an infinite number of blades and an exit angle of 90 degrees would be a horizontal line; however, since the number of blades is finite and the losses change as flow rate varies, this is the shape of the curve that results
Theoretically, a curve with an infinite number of blades and an exit angle of 90 degrees would be a horizontal line; however, since the number of blades is finite and the losses change as flow rate varies, this is the shape of the curve that results
Theoretically, a curve with an infinite number of blades and an exit angle of 90 degrees would be a horizontal line; however, since the number of blades is finite and the losses change as flow rate varies, this is the shape of the curve that results
Theoretically, a curve with an infinite number of blades and an exit angle of 90 degrees would be a horizontal line; however, since the number of blades is finite and the losses change as flow rate varies, this is the shape of the curve that results
In other words, as long as the impeller has radially straight blades, will the theoretical head be linear? Can it be understood this way?