| 摘要 |
<p>Generally speaking, stall-regulated mill blades have a lower propulsive effect at higher than at lower temperatures because the air density at any given wind velocity is lower, the higher the temperature is. This condition is critical at the stall-wind velocity where the mill produces the maximum effect at which it is designed to perform. If the wings are regulated for maximum performance at high temperatures, then overload will occur at low temperature stall-wind velocity conditions. In consequence, the wings are normally adjusted to low temperature conditions, in return for which it becomes necessary to relinquish the maximun effect at high temperatures. With the invention, an air temperature sensor (10, 16, 22, 34) is provided which by means of connected actuator means (14, 20, 32) can change the wing structure such that the wing becomes generally less effective at decreasing temperatures. Hereby it is possible to increase the effect of the mill, in that it will be able to better exploit the high wind velocity at high temperatures without incurring problems at low temperatures in terms of overload.</p> |
