Optical pressure-sensitive paint dynamic pressure calibration cabin of standing wave tube type

Abstract

The invention relates to a dynamic pressure calibration device, and the device employs a standing wave theory to construct a periodic dynamic change pressure field. The device is mainly used for the calibration of a dynamic pressure of an optical pressure-sensitive paint, and also can be used for the periodic dynamic calibration of other changes related with the pressure changes, and provides a new scheme for the calibration of national dynamic frequency response characteristics. Based on the standing wave superposition and standing wave resonance principles, a three-segment type dynamic calibration cabin structure is designed, thereby facilitating the disassembly and replacement according to different experiment conditions. The machining material of the calibration cabin is organic glass, and a side wall is a plane, thereby reducing the optical scattering, and improving the optical measurement precision. In order to reduce the loss caused by section changes, a transition structure with the continuously changing section is designed. Meanwhile, in order to guarantee the accurate calibration result, a pressure sensor probe for reference and a PSP calibration piece remain in the same plane, and are oppositely parallel to a wave plane of a plane pressure wave. The calibration cabin is simple in structure, is convenient to machine, is strong in anti-interference capability, and can effectively reduce the experiment cost.

Description

technical field [0001] The invention relates to a dynamic pressure calibration device, which uses the acoustic standing wave theory to construct a periodic dynamic pressure field, which is mainly used for dynamic pressure calibration of optical pressure-sensitive coatings, and can also be used for other periodic dynamic calibrations related to pressure changes. Background technique [0002] At present, the latest optical pressure measurement technology——optical pressure sensitive paint (PSP) pressure measurement, has been favored by many experimental workers because of its advantages of no interference to the flow field during the pressure measurement process, low experimental cost, and global measurement. favor. Before using this technology for unsteady measurement of dynamic pressure, in addition to static calibration of the paint used to obtain the functional correspondence between the light signal and pressure, it is also necessary to perform dynamic calibration of the p...

AI Technical Summary

Problems solved by technology

However, the oscillating jet is generally calibrated in an open space. For pressure measurement methods such as optical pressure-sensitive coatings, it will be interfered by many external factors, such as light and noise, which will cause a decrease in calibration accuracy; variable volume pressure calibration The frequency of pressure changes that can be generated by the cabin is small and the waveform is easily distorted, resulting in too small a signal-to-noise ratio during calibration measurement and making the measurement inaccurate

[0004] Since the pressure measurement process of PSP paint is based on the principle of photoluminescence and oxygen quenching, that is to say, the optical path needs to be designed to give ultraviolet light during the measurement process, and the pressure value is converted by collecting the optical signal of the excited light, while the existing sensor calibration The ordinary dynamic pressure calibration chamber is an optically closed structure, which cannot complete the dynamic calibration of PSP coatings

At present, there is still a large gap in the domestic research on the dynamic pressure calibration applied to PSP coatings, especially the periodic dynamic pressure calibration to obtain the frequency response characteristics of PSP coatings.

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