Let’s take a look and see if this statement is correct
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Multi-stage pumps can achieve a higher head because they have more than one impeller on the shaft, with the impellers being accelerated stage by stage. Everyone says whether this statement is correct; I think it is, but the answer says it’s wrong. Don’t understand
It depends on how it’s asked; what are the prerequisites? The test questions are all word games.
Multistage pumps can achieve a high head because more than one impeller is mounted on the shaft, and the fluid is accelerated stage by stage through these impellers.
The impeller does not accelerate; it is the medium that accelerates
This post was last edited by CHANGBAISHI on 2019-12-22 at 16:51. “The impeller is accelerated stage by stage, thus enabling a higher head to be achieved. ” This gradual acceleration requires careful consideration:) Is it the fluid that is accelerating, or the rotor?:) Well, since the impeller sets on a single rotor all rotate at a constant speed, it can be understood as the fluid undergoing gradual acceleration. So you’re right, right?:P But such an explanation actually gives rise to several other problems. If the velocity of the fluid increases, what happens to the pressure? Flow rate, velocity? As for this idea of a “gradual increase in speed,” there is still the following explanation needed – what could it be? lol
The impeller is accelerated stage by stage – this statement is incorrect
It is by applying pressure step by step that high pressure is achieved, not by increasing speed step by step
The head of a centrifugal pump is closely related to the impeller diameter, the number of impellers, and the rotational speed. When the rotational speed and impeller diameter remain constant, the more impellers there are, the higher the head will be. Assuming no other factors are considered, theoretically the head of a centrifugal pump is the sum of the heads generated by each impeller