Near wall flow velocity measuring device

Abstract

Provided is a near wall flow velocity measuring device formed by a flexible film, a multichannel constant-temperature controller, and a computer. The computer is connected with the multichannel constant-temperature controller. The multichannel constant-temperature controller is connected with the flexible film. A measuring element array is printed on the upper surface of the flexible film. A power supply line is printed on the lower surface of the flexible film. Measure elements are connected with the power supply line and are heating wires. The multichannel constant-temperature controller is used for providing controllable-output-power power for each measuring element and maintaining each measuring element at a certain constant temperature in virtue of fast output power regulation. The computer is used for computing and recording measured data. The near wall flow velocity measuring device prevents disturbance of contact measurement on a flow field, solves measurement incapability of noncontact measurement, such as PIV, LDV and the like, at a near wall, and provides a new solution for near wall flow velocity measurement.

Description

technical field [0001] The invention relates to flow field testing, especially related to the measurement of near-wall flow velocity. Background technique [0002] At present, there are mainly two methods for measuring fluid flow velocity: contact method and non-contact method. Contact measurement (such as probes, hot wires, etc.) methods must place the detection device in the measured fluid, which will inevitably cause disturbance to the fluid flow field, thereby affecting the accuracy of the measurement results; non-contact measurement methods such as PIV, LDV, etc. , because the optical non-contact measurement method is used, there is no need to place the detection device in the measured flow field, only the laser can be irradiated to the process measurement area, so it will not cause disturbance and influence on the flow field. Non-contact measurement is the mainstream choice of current flow field measurement. [0003] Although non-contact measurements such as PIV and ...

AI Technical Summary

Problems solved by technology

[0004] In order to measure the flow velocity near the wall more conveniently and accurately, the present invention provides a flow velocity measurement device near the wall, which can avoid the disturbance of the flow field by the contact measurement method, and can also solve the problem of non-contact measurement methods such as PIV and LDV. The disadvantage of being unable to measure near the wall provides a new solution for the measurement of fluid velocity near the wall

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