Device and method for testing wall shear stress based on flexible heat-sensitive sensors

Abstract

The invention discloses a device and a method for testing wall shear stress based on flexible heat-sensitive sensors. The device comprises a flexible heat-sensitive sensor array, a high-precision constant-current source, a signal conditioning circuit, a data acquisition module, a temperature compensation module, a data transmission module and a data processing and storage module. The device and the method have the intentional effects that the device adopts the flexible heat-sensitive sensors which are low in thickness, so that a flow field to be tested is hardly affected, and the accuracy and validity of testing are improved; the flexible heat-sensitive sensors are based on heat transfer theory and are fixed in the flow field by adopting an attaching method, so that the wall shear stress can be subjected to non-destructive real-time measurement, the change of underwater wall shear stress can be sensed effectively, impact of a wider range caused by water flow and impurities in water can be withstood, and the test on the underwater wall shear stress can be realized; and due to the adoption of the flexible heat-sensitive sensors, the flexible heat-sensitive sensors can be attached tightly according to the shape of a tested wall, so that the environmental adaptability of the device is improved.

Description

Technical field: [0001] The patent of the present invention relates to a wall shear stress measurement device and measurement method based on a flexible thermal sensor, especially a test instrument that can perform non-destructive real-time measurement of wall shear stress, and can realize underwater wall shear stress testing . Background technique: [0002] Gases, liquids, and various fluids will exhibit relative viscous friction when they flow through any solid wall. The frictional stress corresponding to the frictional resistance is also called the wall shear stress, which is a basic and very important physical quantity to characterize the fluid-wall interaction and the flow characteristics near the wall. Fluid wall shear stress can be used to characterize wall viscous resistance, calculate frictional resistance, reflect boundary layer flow state, detect boundary layer separation and transition, etc. , Fluid separation and other engineering applications are extremely im...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing technology cannot measure the shear stress of the underwater wall surface, the present invention provides a wall shear stress test device based on a flexible thermal sensor. The flexible thermal sensor used in the device is attached to the fluid wall surface. Due to its small thickness, Reduce the impact on the surface flow field, and at the same time be able to withstand a large impact of the fluid

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