Wind tunnel test section bottom plate surface temperature uniformity testing device and testing method thereof

Abstract

The invention provides a wind tunnel test section bottom plate surface temperature uniformity testing device and a testing method thereof. According to the scheme, the testing device comprises a bottom plate block, optical fibers, a fiber bragg grating signal demodulator and an upper computer; the number of the optical fibers is k, wherein k is a non-zero natural number; the k optical fibers are arranged on the bottom plate block in parallel; n fiber bragg gratings with different reflection center wavelengths are etched on each optical fiber, and the n fiber bragg gratings form a fiber bragg grating string, wherein n is a non-zero natural number; each optical fiber grating is packaged by a heat conduction substrate; all the fiber bragg grating strings are connected with the fiber bragg grating signal demodulator; and the fiber bragg grating signal demodulator is in data communication with an upper computer through a data line. According to the scheme, the temperature uniformity of thebottom plate surface of a wind tunnel test section can be accurately and effectively tested, the wiring is simple, the maintenance is convenient, the anti-interference capability is high, and the influence of the wind tunnel environment and gas flow is avoided.

Description

Technical field [0001] The invention relates to the technical field of temperature testing, in particular to a testing device and a testing method for the surface temperature uniformity of the bottom plate of a wind tunnel test section. Background technique [0002] In the wind tunnel test process of some special wind tunnels and environmental wind tunnels, the temperature distribution of the bottom plate surface of the wind tunnel test section has an important influence on the flow field quality, environmental simulation and parameter analysis of the blowing test. Therefore, it is particularly important to accurately obtain the temperature distribution uniformity of the floor surface of the wind tunnel test section. At present, there are two main ways to test the surface temperature uniformity of the bottom plate of the wind tunnel test section. [0003] One way is to use the traditional electrical temperature sensor Pt100 for testing. It is to evenly arrange multiple Pt100s on t...

AI Technical Summary

Problems solved by technology

Since the infrared sensor in this method is usually installed at a certain distance from the bottom plate of the wind tunnel test section, the infrared temperature sensing image captured not only includes the temperature of the bottom plate of the wind tunnel test section but also includes the temperature of the infrared sensor and the wind tunnel test section. The gas temperature between the bottom plates of the hole test section makes this test method very susceptible to the influence of the use environment

In addition, during the wind tunnel blowing test, the gas will flow rapidly, which will cause the measured temperature image to be a temperature cloud, which cannot be used to represent the temperature of the wind tunnel floor

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