Net positive suction head required (NPSHR) is closely related to inducer performance and is animportant requirement for overall pump performance. The ability of an inducer to propagate fluidtowards the impeller inlet is greatly diminished as the fluid begins to rotate with the impeller blades. Bymachining helical grooves in the inducer housing that are in a counter rotation to the inducer blades, thefluid that has rotational energy is channeled up the grooves and towards the impeller. The helicalgroove concept was tested on an axial centrifugal pump and yielded positive results. NPSHR level wasimproved with the modified grooved inducer inlet housing without significant change in the head,power, or efficiency when compared to the same pump without the modification.
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