Active control strategies for outdoor near-surface wind field simulation in a multiple-fan wind tunnel

This paper presents a multiple-fan wind tunnel based on active control technology. The wind tunnel has 6 swivel plates which can rotate in -90°~+90° at the entrance. Each swivel plate consists of 8 fans. The wind field in the wind tunnel can be changed by controlling the fan speeds and the angles of swivel plates. We use a master-slave control structure, instead of the previously used lumped structure, to realize the separate control of each fan as well as each swivel plate. After the fan speed is improved, new control strategies are proposed according to the uniform assumption of the outdoor wind field and the effects of fans' voltages and rotation angles on wind speed and direction. Experiments' results based on several statistical indicators indicate that the new active control strategies, compared with the preciously used stochastic control strategy, can better simulate the outdoor near-surface wind fields.

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