Reflection Ultrasonic Anemometer and Wind Velocity Detection Method

Abstract

The invention provides a reflective ultrasonic anemometer and a wind speed detection method. The reflective ultrasonic anemometer includes a base, a transducer, a support column, a reflector and an analysis unit; the transducer is arranged on the base, and the The reflector is located on the upper side of the base and has a concave reflective surface; the support columns are arranged between the base and the reflector, and the support columns are arranged between adjacent transducers; four transducers The sensor and four supporting columns are arranged on the base, and the supporting columns and the transducers are arranged alternately. On the base, the central angles corresponding to the adjacent supporting columns and the transducers are all 45°; the calculation unit is used for The corrected wind speed is obtained according to the calculated wind speed V output by the analysis unit, a, b, and c are all constants, and d is a parameter related to the measured wind direction angle. The invention has the advantages of accurate wind speed measurement, large wind speed measurement range and the like.

Description

technical field [0001] The invention relates to wind speed detection, in particular to a reflective ultrasonic anemometer and a wind speed detection method. Background technique [0002] The measurement of wind speed and direction is of great value in many industries such as meteorological monitoring, wind power generation and agriculture. Among them, in the field of meteorological monitoring, especially marine meteorological monitoring, the requirements for wind speed measurement range are relatively high, and the anemometer must be able to measure (40~60) m / s or even higher wind speed; in the field of wind power generation, the measurement of wind speed and direction Accuracy and measurement range directly determine the working state of the wind turbine (start small fan or large fan or stop), and affect the power generation efficiency of the wind generator (the pitch system adjusts the windward angle of the blade according to the wind speed, and the yaw system adjusts the ...

AI Technical Summary

Problems solved by technology

During the wind tunnel test, it was found that after calibration, the calibrated direction measurement was accurate, but when the anemometer was turned, it was found that the wind speed measurement at other angles had a large error

[0008] 2. Attenuation and loss of ultrasonic signals in strong winds;

[0009] Reflective ultrasonic time-of-flight anemometer, the conventional reflective surface is a flat design, when the wind speed is high, there is a problem that the signal is blown away, resulting in the received echo signal amplitude is very small and difficult to detect, or can not be received to the echo signal

Some manufacturers design the reflective surface as a concave structure, most of which are spherical surfaces with a certain curvature, which can reduce the signal weakening and loss in strong winds to a certain extent. However, it is difficult for a concave surface with a fixed curvature to meet the reflection requirements of all wind speeds, such as intermediate wind speeds. When the reflection requirements are met, the high wind speed signal tends to reflect excessively and cannot enter the ultrasonic transducer, and the concave surface with a certain curvature will also introduce the nonlinear problem between the wind speed measured by the anemometer and the standard wind speed

[0010] To sum up, when the reflecting surface is flat, the problem of signal attenuation and loss is serious when the wind speed is high, but there is no nonlinear problem of wind speed measurement

When the reflective surface is a spherical concave surface with a fixed curvature, although the attenuation and loss of high wind speed signals can be reduced to a certain extent, it cannot meet the reflection requirements of all wind speed ranges, and it will also introduce nonlinearity between the measured wind speed and the standard wind speed question

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