Multi-hole probe automatic calibration system and method

Abstract

The invention provides a multi-hole probe automatic calibration system and method. The system comprises a multi-hole probe; multiple piezometer tubes of which one end of each is connected with each pressure measuring hole of the multi-hole probe; multiple pressure sensors of which each is connected with the other end of each piezometer tube; an angle transformation device which is used for transforming the attack angle and the sideslip angle of the multi-hole probe; a controller; and an upper computer. The invention also discloses the multi-hole probe automatic calibration method comprising the step that parameters are set on the upper computer; the zero position of the attack angle and the sideslip angle of the multi-hole probe is determined; the attack angle of the multi-hole probe is transformed to multiple preset attack angle values one by one, and the sideslip angle of the multi-hole probe is transformed to multiple preset sideslip angle values one by one so that the pressure value acquired by each pressure sensor under each preset attack angle value and each preset sideslip angle value of all the preset wind speed values within the wind speed interval is acquired; and the calibration fitting formula is calculated through the upper computer. Full-automatic calibration can be realized and the calibration accuracy can be enhanced.

Description

technical field [0001] The invention belongs to the field of aerodynamic wind tunnel tests, and in particular relates to an automatic calibration system and method for a porous probe. Background technique [0002] In low-speed wind tunnels, it is often necessary to measure flow field parameters such as wind speed and direction. Among various testing instruments and methods, porous probes have been used for a long time due to their advantages of low equipment cost, easy use, not easy to damage, and easy maintenance. It is a commonly used instrument in flow field measurement. When using a multi-hole probe to measure flow field parameters, it is only necessary to measure the pressure value of each hole of the multi-hole probe, and then the flow field parameters such as wind speed and direction can be calculated through the calibration fitting formula of the probe. [0003] The theoretical situation of the porous probe is that except for the central hole, the corresponding hole...

AI Technical Summary

Problems solved by technology

[0006] (1) In general probe calibration, the airflow deflection angle caused by the processing and installation errors of the wind tunnel and the blockage effect of the probe calibration device on the wind tunnel is often ignored, resulting in the angle of attack when the angle of the porous probe changes The zero positions of α and sideslip angle β are not facing the direction of incoming flow, which leads to insufficient fineness and accuracy of the calibration results

[0007] (2) The calibration system is intelligent and the degree of automation is not high. It is impossible to integrate the wind speed control, probe angle control, pressure data acquisition, airflow deflection angle adaptation and adjustment, and calibration formula calculation and fitting into a fully automatic system. Complete the entire probe calibration at one time, which consumes manpower and financial resources;

[0008] (3) Porous probes often have various specifications such as five holes or seven holes, and there is a lack of an automatic calibration system that is highly adaptable and can be easily expanded and applied according to the probe specifications

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