A study of priming processes in a centrifugal pump

Rachman, D (1966) A study of priming processes in a centrifugal pump. MSc(R) thesis, University of Glasgow.

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A search through literature reveals that there is no method for converting a standard centrifugal pump with a shrouded impeller, to self-priming operation without the use of valves or large loss in efficiency. A review of work carried out by Dr. Ing. A. Welte in Germany shows that, in the case of open shrouded impellers the pump operation is subject to instability in early stages of priming, if the re-fluxing jet is directed against the direction of rotation of the impeller. The conclusions of this work are, that the maximum attainable vacuum is a direct function of the impeller speed alone, and the air pumping capacity depends not only on the impeller width but also on the method of introducing the recirculating fluid. Furthermore the turbulent nature of flow renders it unsuitable for theoretical treatment. The investigation described in the thesis is carried out in two stages. The first, a feasibility study, is concerned with the alternative methods for energising a mixture of air and water by an impeller. It is found that the best method is by directing a jet at right angles against the suction end shroud of the impeller. An investigation of the jet positioning and casing geometry leads to the conclusion that the jet must be placed 180

Item Type: Thesis (MSc(R))
Qualification Level: Masters
Keywords: Mechanical engineering, Fluid mechanics
Date of Award: 1966
Depositing User: Enlighten Team
Unique ID: glathesis:1966-72168
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 17 May 2019 12:42
Last Modified: 17 May 2019 12:42
URI: https://theses.gla.ac.uk/id/eprint/72168

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