D.H.Zeiner-Gundersen, S.A.S.Zeiner-Gundersen Hydrodynamic testing of flexible profiles for a vertical axis turbine |
Applied hydromechanics, Vol. 17 (89) ¹ 4, (2015) |
| Hydrodynamic turbine functionality depends on the ability of the individual profiles to capture the water energy efficiently during rotation. Here, we describe a unique flexible profile design based on hydrodynamic thrust characteristics inspired by swimming and flying creatures. The concept was based on a flexible double cambered profile that would have a relatively high lift to drag ratio independent of the rotational azimuth position in a vertical axis hydrodynamic turbine application. In order to establish the design of a profile to be implemented into a vertical axis turbine, several different flexible profile models were tested in a cavitation tunnel with controlled water flow dynamics, and their lift, drag, and momentum characteristics were established. Three different diameters of the leading edge rod/profile were tested: 20, 30, and 40 mm corresponding to thickness ratios of 7%, 10%, and 13%, respectively. The material characteristics of the flexible fabric used in the tests had positive features with respect to marine propulsion, unwanted marine growth on its surface, flexibility, and low coefficients of friction. |
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KEY WORDS: flexible profile turbine, hydrodynamics, cascade model |
| TEXT LANGUAGE: English |