Flow guiding device of vertical axis tidal current generator

Abstract

The invention discloses a diversion device of a vertical axis tidal generator, which relates to a diversion device of a vertical axis tidal water turbine which generates power with the energy of the rivers or ocean currents with quite low water flow speed. The device is technically characterized in that a main runner consists of the inlet of the diversion device, a contraction section, a middle runner, a divergent section and the outlet of the diversion device. The fluid is accelerated when flowing past the front sections of the contraction section and the middle runner; the flow speed from the tail end of the middle runner to the outlet of the diversion device is reduced, so that the pressure is recovered. In this way, the liquid flows the turbine with quite high flow speed, so as to improve the utilization rate of the water energy and recover stable flow status at the downstream of the turbine. The device is also provided with an auxiliary runner, so that the circular arc-shaped low-pressure position of the of the inflow surface at the inlet of the diversion device is communicated with the opening at the tail end of the middle runner; the structure can pump the fluid in the middle runner, expand the pressure difference in front of and behind the turbine, promote the fluid to be further accelerated and improve the flow pattern of the fluid.

Description

technical field [0001] The invention relates to a flow guiding device of a vertical axis tidal current generator (or called a vertical axis tidal current turbine, a vertical axis tidal current turbine), in particular to a vertical axis tidal current generator utilizing fluid kinetic energy in the horizontal direction of a river or an ocean current with a relatively low flow velocity to generate electricity. Flow guides for tidal turbines. The invention can also be applied to wind power plants. Background technique [0002] So far, in order to reduce the start-up velocity of vertical-axis tidal current generators (or called vertical-axis tidal current turbines, vertical-axis tidal current turbines) and improve the utilization efficiency of tidal current energy as much as possible, linkage adjustment of blade angles or low-speed starting devices are usually used. The so-called linkage adjustment of the blade angle is to use a gear set or similar device to adjust the upstream ...

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Problems solved by technology

In the Journal of Harbin Engineering University, Volume 28, No. 7, July 2007, Zhang Liang of Harbin Engineering University published an article "Hydrodynamic Design of Tidal Turbine Dome" by referring to the principle of wind turbine diffuser to propose a tidal current turbine. Shroud, this technology only depends on the change of cross-sectional area to increase the flow rate, the effect is limited

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