Device and method for measuring fluorescent oil flow friction force field

Abstract

A fluorescent oil flow friction field measurement device, including a CCD camera, LED light source, computer, wind tunnel for testing and spraying equipment; the spraying equipment is composed of a spray gun and a high-pressure air source, the high-pressure air source is a nitrogen source; the CCD camera and The LED light sources are respectively installed outside the observation window of the wind tunnel for the test, and the LED light source can be irradiated on the model test piece set in the wind tunnel for the test, and the CCD camera can effectively capture the image information of the model test piece; the LED light source passes through The wire is connected to the peripheral power supply, the information output end of the CCD camera is connected to the corresponding interface of the computer through a cat6 network cable, and the medium inlet of the spray gun is connected to the medium outlet of the high-pressure air source through a pipeline. The invention can make the paint on the surface of the model evenly distributed, can reach a stable state as soon as possible under the action of the flow field, reduces the link and cost of model processing, greatly reduces the measurement cost, and reduces the influence of measuring equipment on the flow field on the surface of the model.

Description

technical field [0001] The invention belongs to a device for measuring the surface relative friction force field of a wind tunnel test model. Background technique [0002] Aircraft drag has always been one of the difficulties and hotspots in aerodynamics research. It is composed of surface frictional resistance, induced drag, pressure difference drag and interference drag. Surface frictional drag is one of the important drag sources. [0003] Frictional resistance is one of the most important and difficult fluid flow parameters to measure. At present, the technology used to measure model surface friction is basically based on single-point measurement technology, which cannot provide global friction resistance; in addition, such as oil film interferometry technology, liquid crystal friction measurement technology, etc., although local Continuous friction force field, but due to its cumbersome and complicated calibration process, it cannot be promoted in wind tunnel tests, an...

AI Technical Summary

Problems solved by technology

At present, the technology used to measure model surface friction is basically based on single-point measurement technology, which cannot provide global friction resistance; in addition, such as oil film interferometry technology, liquid crystal friction measurement technology, etc., although local Continuous friction force field, but due to its cumbersome and complicated calibration process, it cannot be promoted in wind tunnel tests, and cannot provide effective support for model development

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