Thesis (Ph.D.)--McMaster University, 2005. / Advisor: David S. Weaver. Includes bibliographical references (leaves 266-274). Also available online.

The pressure distributions and forces presented in a thesis by Hossain [1] for a centrifugal pump illustrated a somewhat complex inter-relationship between various geometric and operating parameters of the pump studied. The pump had an open faced impeller of 33.65 cm diameter with 5 blades of backswept design. It was felt that the best way to resolve some of the questions related to Hossain’s results was to determine the fluid velocity field inside the pump. Thus the flow field through the impeller passages was measured using a 1-D Laser Doppler Velocimetry (LDV) system. The LDV was used to measure the radial and tangential velocity components as well as the turbulence intensities over the region accessible through the two optical windows in the front of the pump housing. Five axial planes were investigated by recording measurements along two radial lines at azimuthal angles of 45° and 315° (with respect to the horizontal axis of the pump) for design operating conditions. A once per revolution signal was used to supply the LDV system with a reference for the rotor position. It was found out that a leakage flow existed near the front wall of the impeller at z/h = 0.11, which was generated by the pressure difference between the impeller exit and inlet. It was also concluded that the velocity field was not fully two-dimensional in nature. This was believed to be a result of the 90° turn that the fluid endures as it enters the impeller inlet from the suction pipe.

The pressure distributions and forces presented in a thesis by Hossain [1] for a centrifugal pump illustrated a somewhat complex inter-relationship between various geometric and operating parameters of the pump studied. The pump had an open faced impeller of 33.65 cm diameter with 5 blades of backswept design. It was felt that the best way to resolve some of the questions related to Hossain’s results was to determine the fluid velocity field inside the pump. Thus the flow field through the impeller passages was measured using a 1-D Laser Doppler Velocimetry (LDV) system. The LDV was used to measure the radial and tangential velocity components as well as the turbulence intensities over the region accessible through the two optical windows in the front of the pump housing. Five axial planes were investigated by recording measurements along two radial lines at azimuthal angles of 45° and 315° (with respect to the horizontal axis of the pump) for design operating conditions. A once per revolution signal was used to supply the LDV system with a reference for the rotor position. It was found out that a leakage flow existed near the front wall of the impeller at z/h = 0.11, which was generated by the pressure difference between the impeller exit and inlet. It was also concluded that the velocity field was not fully two-dimensional in nature. This was believed to be a result of the 90° turn that the fluid endures as it enters the impeller inlet from the suction pipe.

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Thesis (Master)--İzmir Institute of Technology, İzmir, 2006. / Keywords:Computational fluids dynamic, pump characteristics, turbomachinery, pumps, centrifugal pumps. Includes bibliographical references (leaves 88-89).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1928. / Cover title. Reprinted from the Journal of the American chemical society, v. 45, December, 1923, p. [2910]-2917, v. 48, 1926, p. [3081]-3092, and v. 49, 1927, p. [2920]-2934. eContent provider-neutral record in process. Description based on print version record.

M.Ing. (Mechanical Engineering) / Please refer to full text to view abstract

The air chamber has certain advantages over both the open-top surge tank and the valve-type surge suppressor for controlling pressure surges in pump-discharge lines. The main purpose of this study was to produce charts which can be used for designing or checking the size of an air chamber required for a particular pumping installation. The characteristics method was used to convert the two partial differential equations of momentum and continuity into four total differential equations. The solution of the equations (finite-difference form) was carried through by digital computer to provide the data required for the preparation of the charts. Results obtained on the digital computer by the method of characteristics are checked by the graphical method. Examples demonstrating the use of the charts are included. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

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