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1

Numerical study on the optimization of hydrodynamic performance of oscillating buoy wave energy converter

Lai Wenbin, Xie Yonghe, Li Detang

Polish Maritime Research

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2021

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nr 1

48--58

EN

The oscillating buoy wave energy converter (OBWEC) captures wave energy through the undulating movement of the buoy in the waves. In the process of capturing wave energy, the hydrodynamic performance of the buoy plays an important role. This paper designed the “Haida No. 1” OBWEC, in which the buoy adopts a form of swinging motion. In order to further improve the hydrodynamic performance of the buoy, a 2D numerical wave tank (NWT) model is established using ADINA software based on the working principle of the device. According to the motion equation of the buoy in the waves, the influence of the buoy shape, arm length, tilt angle, buoy draft, buoy width, wave height and Power Take-off (PTO) damping on the hydrodynamic performance of the buoy is studied. Finally, a series of physical experiments are performed on the device in a laboratory pool. The experimental results verify the consistency of the numerical results. The research results indicate that the energy conversion efficiency of the device can be improved by optimizing the hydrodynamic performance of the buoy. However, the absorption efficiency of a single buoy for wave energy is limited, so it is very difficult to achieve full absorption of wave energy.

2

Experiments on the Model Testing of the 2nd Phase of Die Casting Process Compared with the Results of Numerical Simulation

Dańko R., Dańko J., Stojek J.

Archives of Foundry Engineering

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2015

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Vol. 15, iss. 4

21--24

EN

Experiments of filling the model moulds cavity of various inner shapes inserted in rectangular cavity of the casting die (dimensions: 280 mm (height) x 190 mm (width) x 10 mm (depth) by applying model liquids of various density and viscosity are presented in the paper. Influence of die venting as well as inlet system area and inlet velocity on the volumetric rate of filling of the model liquid – achieved by means of filming the process in the system of a cold-chamber casting die was tested. Experiments compared with the results of simulation performed by means of the calculation module Novacast (Novaflow&Solid) for the selected various casting conditions – are also presented in the paper.

3

Pomoc dydaktyczna do badania przemian gazowych

Kłopocki A.

Aparatura Badawcza i Dydaktyczna

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1999

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T. 4, nr 4

9--13

PL

W publikacji opisano przyrząd do badania przemian termodynamicznych gazu. Przyrząd traktowany jest, jako kolejne rozszerzenie zestawu środków dydaktycznych do realizacji eksperymentów fizycznych wspomaganych komputerowo. Wykonano prototyp przyrządu i dokonano możliwie pełnych jego testów. Umożliwia on realizację bardzo szybkiego sprężania gazu, tj. przemianę zbliżoną do adiabaty oraz bardzo powolne sprężanie gazu (prawie kwazystatyczne), zbliżone do izotermicznego. Nowo dopisane programy komputerowe, obsługujące każdą z przemian, pozwalaj ą wyświetlać na wykresach przebiegi: ciśnienia, objętości, temperatury i ciśnienia w funkcji objętości podczas sprężania gazu. A ponadto umożliwiają obliczanie, a następnie wyświetlanie: wykładników politropy sprężania oraz ciepła i pracy przemiany.

EN

The article describes a device for investigation of thermodynamic gas conversions. The device is presented as a further development of educational equipment set for conducting computer supported physical experiment. A prototype of the device was constructed and possibly complete tests of the device were conducted. The device enables to realise very slowly (nearly quasi-static) compression of gases that nears the isothermal compression. Newly added computer programmes, servicing each conversion, enable to present graphically course of pressure, volume, temperature and pressure in the function of volume during the compression of gases. Furthermore, the programmes enable to compute and, subsequently, project polytrop exponents of the compression as well as heat and work of the conversion.