CN-121977784-A - Non-contact flow velocity and manifold measuring device for wind tunnel flow field

CN121977784ACN 121977784 ACN121977784 ACN 121977784ACN-121977784-A

Abstract

The invention discloses a non-contact flow velocity and manifold measuring device for a wind tunnel flow field, which comprises a tracing bubble generating unit, a multi-camera image acquisition unit, an illumination unit, a synchronous trigger control unit and a data processing terminal. The tracing bubble generating unit adjusts the pressure, the content and the proportion of helium, air and bubble liquid through a control console, a required bubble field is generated according to experimental requirements, and a bubble releasing pipe is closely attached to a fan and is not inserted into a flow field measuring area. The multi-camera image acquisition unit comprises at least three digital cameras arranged outside the wind tunnel covering the target measurement area from different positions, heights and angles. The illumination unit adopts a front illumination mode, a surface light source is arranged at the top of the wind tunnel, and a removable light absorbing material layer is arranged on the wall surface of the measurement area. The synchronous triggering control unit realizes synchronous shooting of multiple cameras in a hard triggering mode. The data processing terminal receives the image data and executes a Lagrange particle tracking algorithm to realize non-invasive accurate measurement of flow field speed and manifold.

Inventors

CHEN JIUJIU
YU SHUCHEN
Pu Xiuyang
ZHANG LU
DU JING
MA XIAOJUN

Assignees

北京联合大学

Dates

Publication Date: 20260505
Application Date: 20260104

Claims (10)

1. A non-contact flow velocity and manifold measurement device for a wind tunnel flow field, comprising: The device comprises a tracing bubble generation unit, a gas supply unit, a bubble liquid supply unit and a bubble release pipe, wherein the tracing bubble generation unit comprises a control console, a gas source, a bubble liquid supply unit and a bubble release pipe, wherein the control console is connected with the gas source and the bubble liquid supply unit and is used for controlling the pressure, the content and the proportion of helium, air and bubble liquid so as to realize the release of required tracing bubbles; The multi-camera image acquisition unit comprises at least three digital cameras, wherein the digital cameras are arranged outside the wind tunnel, the positions, the heights and the shooting angles of the cameras are different from each other, and the digital cameras jointly cover a target measurement area inside the wind tunnel; the device comprises an illumination unit, a measuring unit and a control unit, wherein the illumination unit comprises a plurality of surface light sources, the surface light sources are arranged at the top of a wind tunnel and are positioned above a measuring area, and a front illumination mode is adopted to provide illumination for the measuring area; The synchronous triggering control unit is respectively connected with the digital camera and the data processing terminal through control lines and realizes synchronous triggering of a plurality of cameras in a hard triggering mode, the data processing terminal is connected with the multi-camera image acquisition unit through a data cable and is used for receiving and processing acquired image data, and the data processing terminal is configured to execute a Lagrange particle tracking algorithm.
2. The device for measuring the flow velocity and the manifold of the wind tunnel flow field in a non-contact manner according to claim 1, wherein the trace bubble generated by the trace bubble generating unit is helium bubble, the bubble releasing direction of the bubble releasing tube is consistent with the air flow direction, and the arrangement of the bubble releasing tube does not interfere with the flow field.
3. The non-contact flow velocity and manifold measuring device of a wind tunnel flow field according to claim 1, wherein a preset distance is kept between each camera of the multi-camera image acquisition unit and the wall surface of the wind tunnel, the installation heights of the cameras are different, a multi-view shooting layout is formed, and trace bubbles in a measuring area are ensured to be at least in the field of view of the two cameras.
4. The device for measuring the flow velocity and the manifold of the wind tunnel flow field in a non-contact manner according to claim 1, wherein the surface light source of the illumination unit is an LED light source, and the brightness of the LED light source is adjustable and does not strobe.
5. The non-contact type flow velocity and manifold measuring device of a wind tunnel flow field according to claim 1, wherein the synchronous trigger control unit is positioned outside the wind tunnel and connected with each camera through a control line, so that all cameras can start shooting synchronously, and the frequency and the number of the cameras can be controlled.
6. The non-contact flow velocity and manifold measuring device for the wind tunnel flow field according to claim 1, wherein the light absorbing material layer is black non-reflective flannel, so that light reflection interference particle collection generated by a wind tunnel platform is avoided, and the black non-reflective flannel is fixedly adsorbed on the wall surface of a wind tunnel through a magnetic connecting piece, so that the device is firm and convenient to install and detach.
7. The non-contact flow velocity and manifold measuring device of wind tunnel flow field according to claim 1, wherein the gas source is a helium tank, the helium tank is connected with the control console through a high-pressure gas pipe, the control console is connected with an air compressor and finally connected with the bubble release pipe through a pipeline, and the control console adjusts the particle size of bubbles and the distribution density in space by controlling the pressure of helium, air, the consumption of bubble liquid and the content and proportion of each component.
8. The non-contact flow velocity and manifold measuring device of a wind tunnel flow field according to claim 1, wherein the trace bubble generating unit, the multi-camera image acquisition unit, the illumination unit and the synchronous trigger control unit are all independent modularized components, and the positions and the number of the modules can be adjusted according to the wind tunnel size and the measurement requirement.
9. The non-contact flow velocity and manifold measuring device of wind tunnel flow field according to claim 1, wherein the data processing terminal is arranged outside the wind tunnel and is connected with each measuring equipment in the wind tunnel through a data cable to realize centralized control and data processing.
10. The device for measuring the flow velocity and the manifold of the wind tunnel flow field in a non-contact manner according to claim 1, wherein all device components are uniformly distributed at the outside of the wind tunnel or at the positions where the disturbance of the flow of the air stream can be avoided, so as to realize the non-invasive measurement of the flow field.

Description

Non-contact flow velocity and manifold measuring device for wind tunnel flow field Technical Field The invention relates to the technical field of wind tunnels, in particular to a non-contact flow velocity and manifold measuring device for a wind tunnel flow field. Background Wind tunnel tests are an important means for researching the wind environment of a building, however, the existing flow field speed measurement technology has a plurality of limitations. At present, a mainly adopted contact type measuring method is that physical sensing equipment such as a wind speed sensor, a pitot tube and the like is required to be directly inserted into a flow field, so that a measuring device can generate non-negligible interference on air flow, the original characteristic of the flow field is changed, and the real flowing state cannot be reflected. Meanwhile, the method is limited by the volume and the distribution density of the sensor, only sparse discrete point data can be obtained by the method, the spatial resolution is low, and the complete information of complex flow structures such as building flowing around, vortex shedding and the like is difficult to capture. Disclosure of Invention The invention provides a non-contact flow velocity and manifold measuring device for a wind tunnel flow field, which is used for overcoming at least one technical problem in the prior art. The embodiment of the invention provides a non-contact flow velocity and manifold measuring device of a wind tunnel flow field, which comprises the following components: The device comprises a tracing bubble generation unit, a gas supply unit, a bubble liquid supply unit and a bubble release pipe, wherein the tracing bubble generation unit comprises a control console, a gas source, a bubble liquid supply unit and a bubble release pipe, wherein the control console is connected with the gas source and the bubble liquid supply unit and is used for controlling the pressure, the content and the proportion of helium, air and bubble liquid so as to realize the release of required tracing bubbles; The multi-camera image acquisition unit comprises at least three digital cameras, wherein the digital cameras are arranged outside the wind tunnel, the positions, the heights and the shooting angles of the cameras are different from each other, and the digital cameras jointly cover a target measurement area inside the wind tunnel; the device comprises an illumination unit, a measuring unit and a control unit, wherein the illumination unit comprises a plurality of surface light sources, the surface light sources are arranged at the top of a wind tunnel and are positioned above a measuring area, and a front illumination mode is adopted to provide illumination for the measuring area; The synchronous triggering control unit is respectively connected with the digital camera and the data processing terminal through control lines and realizes synchronous triggering of a plurality of cameras in a hard triggering mode, the data processing terminal is connected with the multi-camera image acquisition unit through a data cable and is used for receiving and processing acquired image data, and the data processing terminal is configured to execute a Lagrange particle tracking algorithm. In some alternative embodiments, the trace bubbles generated by the trace bubble generating unit are helium bubbles, the bubble releasing direction of the bubble releasing tube is consistent with the air flow direction, and the arrangement of the bubble releasing tube does not interfere with the flow field. In some optional embodiments, a preset distance is kept between each camera of the multi-camera image acquisition unit and the wall surface of the wind tunnel, and the mounting heights of the cameras are different, so that a multi-view shooting layout is formed, and trace bubbles in a measurement area are ensured to be at least in the field of view of the two cameras. In some alternative embodiments, the surface light source of the illumination unit is an LED light source, and the brightness of the LED light source is adjustable and does not strobe. In some alternative embodiments, the synchronous triggering control unit is located outside the wind tunnel and connected with each camera through a control line, so that all cameras start shooting synchronously, and the frequency and the number of shooting of the cameras are controlled. In some optional embodiments, the light absorbing material layer is black non-reflective flannelette, so that light reflection interference particle collection generated by the wind tunnel platform is avoided, and the black non-reflective flannelette is fixedly adsorbed on the wall surface of the wind tunnel through the magnetic connecting piece, so that the black non-reflective flannelette is firm and convenient to install and detach. In some alternative embodiments, the gas source is a helium tank, the helium tank is connected with the control console