Aerostatic calibrating system for wall surface shearing strength micro-sensors

Abstract

The invention relates to an aerostatic calibrating system for a wall surface shearing strength micro-sensor. The aerostatic calibrating system comprises a miniature pressure difference pipeline (8). The miniature pressure difference pipeline (8) is connected with an air source device (1) through an air inlet pipeline (3), connected with a pressure measuring system (4) through a plurality of pressure measuring pipelines (5), and connected with an air outlet pipeline (7). The calibrating system has the advantages of being small in size and convenient to carry and can be suitable for aerostatic calibration of a plurality of flexible hot film shearing strength micro-sensors and floating type shearing strength micro-sensors.

Description

technical field [0001] The invention belongs to the field of fluid mechanics, and in particular relates to a static calibration system in air used for wall shear stress microsensors. Background technique [0002] The shear stress generated by the fluid flowing through the surface of the object is the fluid wall shear stress. The fluid wall shear stress is an important physical quantity to study the flow state of the boundary layer, and it is also an important basis for mastering and controlling the frictional resistance of the wall. In the fields of aviation and aerospace, the study of fluid wall shear stress is of great significance to the design of drag reduction and noise reduction of advanced aerospace vehicles, and the optimization design of high maneuverability. [0003] Compared with traditional shear stress measurement devices such as Princeton tubes and two-way diaphragms, microsensors such as flexible thermal film shear stress microsensors and floating shear stress...

AI Technical Summary

Problems solved by technology

[0004] Commonly used static calibration systems in air include flat-plate model calibration system and rotary motion calibration system, but the flat-plate model calibration system needs to rely on the wind tunnel, and the flow field state of the flat plate boundary layer is not easy to control; the shear stress range generated by the rotary motion calibration system is relatively large. small, the state of the flow field is complex, and the average effect is mainly used

[0005] Existing calibration devices for shear stress microsensors are very bulky and need to occupy this room. They are very noisy when running, and they are fixed and cannot be moved, nor can they be used for calibration when there are a large number of sensors at the same time.

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