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On the scaling effects of a single-piston pump

Jonker, Jacob (2018) On the scaling effects of a single-piston pump. Integration Project, Industrial Engineering and Management.


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The Ocean Grazer is a device that converts wave energy into electricity. It uses a piston pump system that is driven by floaters, which move up and down with the motion of the waves. An experimental setup of this pumping system is developed at the University of Groningen,which is denoted as the Single-Piston Pump (SPP) prototype. In order to understand the behaviour and efficiency of the SPP prototype, a mathematical simulation model has been designed by R.M. Zaharia, which addresses most of the characteristics of the SPP. One of the intended functions of this SPP model was, that it could determine how the SPP system behaves when it is scaled up to the full-scale size of the Ocean Grazer. However, due to the inherent nature of a distorted model, bias occurs when outputs of the SPP model are scaled straightforwardly with the Froude law. Therefore, one of the goals of this research is to the check whether the SPP model, with correctly scaled initial parameters, is valid to determine the efficiency of the full-scale model. Another aim of this research is to evaluate the scaling effects of factors that are not taken into consideration in the SPP model, but will be of influence on the outputs. The SPP model with adjusted initial parameters is enlarged with different scaling ratios. Outputs such as, forces, energies and efficiencies are analysed to determine the validity of the model. Furthermore, the forces and energies, regarding the SPP prototype in its initial size, are scaled up straightforwardly to compare the theoretical values with the ones determined by the SPP model.

Item Type: Thesis (Integration Project)
Supervisor name: Vakis, A.
Degree programme: Industrial Engineering and Management
Thesis type: Integration Project
Language: English
Date Deposited: 04 Jul 2018
Last Modified: 05 Jul 2018 10:36

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