Wind mill blade surface pressure measuring cover and measuring system thereof

Abstract

The invention discloses a wind mill blade surface pressure measuring cover and a measuring system thereof, and belongs to the technical field of wind power pressure measurement. A measuring cover whose surface is higher than the surface of a blade is formed transversely on the surface of the wind mill blade, inner concave recessed points capable of accommodating sensors are formed at the periphery of the measuring cover, and the recessed points are internally provided with the sensors. According to the invention, through forming the measuring cover whose surface height is higher than that of the blade on the surface of the blade, the measuring cover does not cause any damage to the blade itself, the obtained precision is satisfactory, and the conflict between the cost and the precision in conventional wind mill blade surface pressure measurement is coordinated. Through preparing the measuring cover by use of glass fiber reinforced plastics or carbon fibers, the measuring cover has a thickness of 6 to 10mm, fixation to the blade itself is realized by use of cementation with assistance of a screw rod for reinforcement, and the measuring cover is internally provided with a differential pressure type pressure sensor with quite high precision, so that the measuring precision of the measuring cover is improved.

Description

technical field [0001] The invention belongs to the technical field of pressure measurement, and in particular relates to a surface pressure measurement cover and a measurement system of a large wind turbine blade under the action of an external flow field. Background technique [0002] Large-scale wind turbine field experiments generally collect and analyze parameters such as natural wind, wind turbine attitude, pressure, and load under the natural working conditions of the actual wind turbine. Measuring the surface pressure distribution of rotating blades is of great significance to the study of wind turbine aerodynamics, but it is also a difficult point. In order to study the unsteady characteristics of wind turbine flow, two methods are usually used to measure the surface pressure distribution of traditional wind turbines in the external flow field. One is to measure the surface pressure distribution by punching holes on the surface of the blade and using a built-in sen...

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Problems solved by technology

One is to measure the surface pressure distribution by punching holes on the surface of the blade and using a built-in sensor. Usually, a differential pressure sensor is used. The patent publication number is CN103382921, which discloses a measurement device for the aerodynamic force of a vertical axis wind turbine blade, including the main shaft of the wind turbine. The upper and lower ends of the main shaft of the wind turbine are respectively fixed with an upper disc and a lower disc, the upper disc is fixed with a first upper support rod, the lower disc is fixed with a first lower support rod, and the lower disc is connected to Rotary shaft, the rotating shaft is connected with the tower cylinder through bearings, the blades are installed between the first upper support rod and the first lower support rod, the characteristics are: the upper end of the blade is fixed with the upper end blade fixing plate, and the lower end of the blade is fixed with the lower end blade A fixed plate, a first pressure measuring mechanism is installed between the upper blade fixed plate and the first upper support rod, the rotation shaft of the lower blade fixed plate is connected to a rigid coupling, and the lower end of the rigid coupling is fixed with a torque sensor, and the torque sensor is connected to the The second pressure measurement mechanism is installed between the first lower support rods. However, this method can meet the measurement accuracy requirements, but when drilling holes and built-in sensors, the surface and internal structure of the blade are seriously damaged, and the cost is high; another method is to The pressure measuring tape is used to measure the surface pressure. The pressure measuring tape has a built-in sensor, usually an absolute pressure sensor. The principle of this method is simple and intuitive. The method uses an absolute pressure sensor, which has low measurement accuracy and is expensive, so it is difficult to meet the requirements

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