Asymmetric air turbine applicable to Asian sea oscillating water column type wave energy generator

Abstract

The invention discloses an asymmetric air turbine applicable to an Asian sea oscillating water column type wave energy generator. The air turbine comprises a hollow hub. Hub heads used for sealing a cavity of the hub are mounted on the two sides of the hub correspondingly. A movable vane wheel capable of rotating around the hub is arranged on the hub. Movable vanes are evenly arranged on the outer wall of the movable vane wheel in the circumferential direction. The vertical section of each vane is in a crescent shape, and the protruding radian of one side of the crescent shape is higher than the protruding radian of the other side of the crescent shape. The two sides of the movable vane wheel are each provided with a circle of flow guiding vanes with the aspect ratio being higher than that of the movable vanes in the circumferential direction of the hub. According to the air turbine disclosed by the invention, the meeting areas of flowing of the pressure faces of the movable vanes at a high incidence flow rate at the exhalation stage can be increased, the flow rate separation phenomenon of airflow on the movable vane suction faces is delayed, power losses caused by air flow entering the downsteam flow guiding vanes from the movable vanes are reduced, the power utilization efficiency of the air turbine at the exhalation stage is improved, and thus the period average efficiency of the air turbine under actual sea conditions is improved.

Description

technical field [0001] The invention belongs to the field of wave energy power generation, in particular to an asymmetrical air turbine suitable for an oscillating water column wave energy power generation device in the Asian sea area. Background technique [0002] Wave energy refers to the kinetic energy and potential energy of waves on the ocean surface, which is proportional to the square of the wave height, the period of motion of the wave, and the width of the wave-facing surface. Although wave energy is the most unstable energy in ocean energy, its reserves in the world are very considerable, with a theoretical estimate of about 17TW·h per year. According to the different working principles of the device absorbing wave energy, wave energy power generation devices can be divided into three types: oscillating water column type, wave-surpassing type, and oscillating body type. In contrast, the Oscillating Water Column (OWC) wave energy generation device has a simple stru...

AI Technical Summary

Problems solved by technology

The traditional Wells-type turbine has the advantages of simple structure and high peak efficiency, and is suitable for European sea areas with good wave conditions. This turbine has extremely high efficiency in a small range of flow coefficient before stalling, but once stalled, the torque The huge reduction of the turbine will instantly deteriorate the performance of the turbine. In addition, the disadvantages of the Wells-type turbine include poor self-starting performance, narrow working range, and high working noise.

Although the peak efficiency of the traditional impulse turbine is not as good as that of the Wells type, it has good start-up performance, no stall phenomenon, and slow decline in efficiency in the area of ​​large flow coefficient. It is especially suitable for use in Asian seas with poor wave conditions, but most of them are symmetrical. , that is, the profile of the moving blade and the position of the guide vane are symmetrical to the centerline of the moving blade along the direction of rotation, and engineering practice shows that the airflow amplitude of the OWC device passing through the impingement turbine during the exhalation phase of the air chamber in the Asian sea area is greater than that during the inhalation phase Airflow amplitude, resulting in a large loss of power during the exhalation phase

Images