7. Specific speed – Specific diameter
7.1 Pumps
A turbomachine must convey a given fluid flow rate q v by giving it an imposed height H m , with the best possible efficiency. In addition, it may be necessary to impose the speed of rotation :
either a driving or receiving machine running at a given speed;
or the risk of cavitation imposes a maximum speed above which it is impossible to operate; a lower speed would have the disadvantage of increasing the size of the machine, which is undesirable from a cost point of view.
It may therefore be useful to characterize families of homothetic turbomachines by a reduced variable...
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Specific speed – Specific diameter
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