Novel probe for measuring structure surface wind speed in wind tunnel test

Abstract

The invention discloses a novel probe for measuring structure surface wind speed in a wind tunnel test. The novel probe comprises a hollow cylinder shell and a long pressure-obtaining tube bent for 90 degrees. The upper end and the lower end of the cylinder shell are respectively provided with a circular upper end plate and a circular lower end plate which seal hollow openings of the cylinder shell. The centers of the upper end plate and the lower end plate are provided with central holes. Acquisition holes are evenly arranged on the edge of the upper end plate along the concentric circle of the upper end plate. The lower end of the cylinder shell is provided with a cylinder in a close clinging way. The side wall of the cylinder shell is transversely provided with a short pressure-obtaining tube directly passing through the hollow part of the cylinder shell. One side of the long pressure-obtaining tube is arranged in the central holes of the upper end plate and the lower end plate in a vertical penetrating way, and the other side transversely penetrates and extends out of the side wall of the cylinder. The novel probe is small in size, low in cost and easy to process, and a defect that the long pressure-obtaining tube is easy to slant after being touched due to the fact that the suspension arm at one end of the long pressure-obtaining tube is over-length is overcome so that the measured wind speed is ensured to be non-directional, and thus real wind speed of direction of an incoming flow can be accurately measured.

Description

[0001] technical field [0002] The invention relates to a novel probe for measuring the wind speed on the surface of a structure in a wind tunnel test, especially capable of ensuring that the measured wind speed is the real wind speed in the incoming flow direction. Background technique [0003] At present, the sensors used for wind speed measurement in wind tunnel tests mainly include hot wires and Owen probes. Among them, the hot wire heats a special metal wire. Since different wind speeds will dissipate different heat, the resistance of the metal wire will change. This principle is used to obtain the wind speed. However, the whole set of hot wire testing equipment is expensive, easy to damage and subject to The external temperature is greatly affected; the Owen probe measures the wind pressure difference between the long and short pressure pipes and obtains the wind speed at the pedestrian height through the Bernoulli equation. Its cost is low and it is easy to install. ...

AI Technical Summary

Problems solved by technology

[0005] Because the Owen probe has the advantages of low cost and easy installation, in order to overcome the shortcoming that the cantilever of the long pressure pipe is too long and is easy to be knocked and distorted, which will cause the measured incoming wind speed to be inaccurate, the present invention improves the Owen probe on the basis of the existing Owen probe. The technology provides a new type of pedestrian wind environment measurement sensor, which is low in cost, easy to install, and can ensure that the measured wind speed is non-directional, that is, the real wind speed in the direction of incoming flow can be measured

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