The main mechanism of a wind booster, as shown in Fig 3, can be separated into 2 functions. The
former is “guiding”; the guide vanes direct wind to impact VAWT blades at effective angles. The latter is “throttling”; the passage between each guide vane is set up to throttle air flow to be accelerated before impacting VAWT blades. The simulated results in Fig 3 show that when the air at the region A flows along a positive X axis through the wind booster, the guide vanes lead the wind to the VAWT blades at the region B. The VAWT blades are effectively pushed by the wind in this region. Also, the guide vanes prevent the wind countering rotation of VAWT at the region C. The passage between two guide vanes is designed to throttle the wind to increase the wind speed. The wind speed at the region B is higher than the region A.