Flexible film type multi-measuring-point pressure measuring belt for low-speed wind tunnel

Abstract

The invention discloses a flexible film type multi-measuring-point pressure measuring belt for a low-speed wind tunnel. The flexible film type multi-measuring-point pressure measuring belt comprises asubstrate base belt and a protective layer arranged on the substrate base belt, wherein a plurality of pressure elements, signal lines and power supply lines for connecting the pressure elements, andreference pressure guide tubes are arranged between the protective layer and the substrate base belt; the reference pressure guide tube is input to each pressure element; and the substrate base belt,the protective layer and the components between the substrate base belt and the protective layer are packaged into a flexible belt-shaped whole body. The flexible film type multi-measuring-point pressure measuring belt provided by the invention has low processing difficulty, is fixed on the surface of a model in a pasting manner, and is convenient to mount and use, and a pressure signal generatedby airflow directly acts on a pressure sensitive chip, thus avoiding pressure transmission loss, effectively improving the reliability and accuracy of a measurement result, and enabling the dynamic pressure frequency to be 5kHz.

Description

technical field [0001] The invention relates to the field of low-speed wind tunnel measurement, in particular to a flexible film-type multi-measuring-point pressure measurement belt for low-speed wind tunnels and a manufacturing method thereof. Background technique [0002] Complex flow phenomena such as turbulent boundary layer, separation flow, shock wave oscillation, flow of local shape change, ablation, and oscillatory combustion in the flow around the aircraft will induce random dynamic pressure on the surface of the aircraft, which is called unsteady pressure. The intensity and frequency of unsteady pressure significantly affect the dynamic load characteristics of aircraft structures. If the frequency of the local unsteady pressure load is coupled with the natural frequency of the structure, it will cause the vibration of the structural parts, resulting in structural fatigue or even failure. Unsteady pressure is also the main source of aircraft aerodynamic noise, whic...

AI Technical Summary

Problems solved by technology

However, it is very difficult to arrange pressure measuring points in some parts of the test model (such as helicopter rotor, wing trailing edge, wing-body junction, external storage, pelvic fin, etc.) due to structural limitations; at the same time, the pressure to be measured is transmitted through pipelines There will be a lumen effect on the sensor, and as the frequency of the pressure to be measured increases, the output waveform of the sensor will be severely distorted

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