Self-Powered Passive Adaptive Control of Pitch Angle and Betz-Shaped Wind Tunnel

Abstract

Owing to both the high cost and the complexity,

for small turbines, the control of pitch angle is usually not a

option though it could keep turbine working in high efficiency

zone while wind speed changes.

In order to solve this problem, a self-powered passive adaptive

control system (SPACS) for pitch angle adjustment has been

developed. Together with this SPACS idea, a Betz-shaped wind

tunnel has also been developed which can reduce the size and

running cost significantly if compared with conventional wind

tunnels. In this paper the main technical principles will be

presented together with some conceptual sketches and initial

results.