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The structure and characteristics of residential vertical wind turbine wake

Jun 11, 2018

Residential vertical wind turbines are getting bigger and their blades longer, so understanding the wake effects of wind turbines is becoming more important. Only by understanding the relationship, can we find the optimal arrangement of vertical wind turbines in residential buildings, thus obtaining the optimal power generation and effectively controlling the risks.

Residential vertical wind turbines will absorb energy from the wind during operation. According to the principle of energy conservation, after the wind blows through the unit, the energy must be lower than before. Therefore, residential vertical wind turbines always form wind shadows behind them, which is what we call the wake.

The structure of residential vertical wind turbine wake consists of several areas, which are near, middle and far. The length of each zone depends on the diameter of the wind wheel and is also related to air pressure, wind speed and atmospheric stability. In general, the length of the near zone is about 2 to 4 times the diameter of the wind wheel. With airflow pipeline extension to blade edge, the house in front of the vertical wind turbine pressure increase, then decrease at the other side of the rotor surface suddenly, after in the near zone increases, until the return to free wind pressure.

When the wind speed within the air pipe of the near residential vertical wind turbines is reduced, and at the other side of the wheel surface remains the same, then in the near zone, as the pressure value gradually recover and continue to reduce; The radius of the wake increases in the near region, and the wind speed decreases due to the conservation of mass and momentum.

By comparison, the length of the middle area of the residential vertical wind turbine wake is about 2 to 3 times of the diameter of the wind turbine, which ends when the inner boundary of the mixing layer intersects with the central axis. The wind speed changes at the intersection. The pressure in the middle zone remains constant, the turbulence at the outer boundary of the wake zone increases, and the wind speed at the center line remains constant.

In addition, the length of residential vertical wind turbine tailings is more than 5 times the diameter of wind turbines. The pressure is constant. Due to the mixing of turbulence, the Central Line wind speed began to increase steadily, restoring the wind speed of the free flow. According to the characteristics of each zone, the optimal distance between vertical wind turbines in residential buildings can be selected, so as to minimize the interaction between equipment.http://www.titanwindturbine.com/