Wind Speed Measurement In Front Of The Blade System Design

Based a 750KW wind turbine wind farm is based on using FLUENT simulation, simulation results show that, due to the rotation of the blades form a larger surface wind speed in front of the blade position decline. Because the root position of the through flow area, behind the impeller blade root position Winds greater. Since the blade root periodic agitation impeller blade root position behind the air to form an irregular variation in time and space small swirl turbulence. To further analyze characteristics of wind speed around the blade, build outdoor wind turbines wind speed measurement platform under natural wind conditions, the measuring point is a half-height blade in front of 2m at the measuring point for the two half-height blade in front of the 0.3m measured point three for the rear cabin just above measurements show that the highest wind speed measuring points 1,2 measuring points, followed by wind speed, wind speed lowest measuring point 3, the first blade is closest to the mainstream wind speed measurement and wind speed volatility is far below the aft cabin measuring point Common engineering practice wind speed measuring instruments, can not be realized under the base rotational speed measurement. Based on this can be used to design a rotating base in the field of wind speed and direction measurement systems, wind speed and direction from the ultrasonic measuring principle, ultrasonic measuring instrument system hardware design wind speed for the principle of transit-time measurement of wind speed, designed to solve two-bearing units installed ultrasonic velocity meter installation on the rotating blades. Using two bearing mounting unit set up rotating test platform, under different rotational angular velocity to compare measurements of a specific wind speed, the test stand speed 15r/min, under 25r/min,35 r/min, ultrasonic wind speed standard measurement system transition value is about 0.35m/s, mechanical rotary wind sensor is also about 0.3m/s transitions, determination marked ultrasonic wind speed measurement system has good accuracy and high measurement accuracy.