垂直軸形風車の後流加速現象

概要

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The flow behind rotor of a Vertical Axis wind Turbine (VAWT) wind tunnel model was measured by means of a two-dimensional hot-wire anemometer system to investigate the flow around VAWT. It is ordinary that the flow behind wind turbine rotors in decelerated downstream. In the flow measurement, however, we observed a peculiar and interesting phenomenon which showed that the flow behind rotor is accelerated downstream under a certain condition. The mechanism of the phenomenon was made up clear as follows : Because of the finite chord length of rotating blades, the blade in the downstream position acts as a propeller, then slow behind rotor is accelerated downstream. A modified two-stage momentum analytical model is presented and it is showed that the calculated results and the experimental results are in good agreement.
1985-01-25