JPH0694741A - Flow measuring apparatus - Google Patents

Abstract

PURPOSE:To obtain a flow measuring apparatus in which analysis of higher level can be conducted. CONSTITUTION:A flow measuring apparatus comprises a visualizing photograph 4 having a smoke discharge unit 1 for discharging smoke 17 into a flow, an illuminator 2 for illuminating the smoke 17 flowing in the flow, and a photograph 3 for photographing the smoke 17 illuminated by the illuminator 2, and an image processor 5 for fetching an image of the flow visualized and photographed by the photograph 4, capturing movement of the smoke 17 and a shape change and quantitatively analyzing the flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow measuring device for measuring a flow by using image processing technology.

[0002]

2. Description of the Related Art Recently, so-called general electronic devices have been downsized as a whole, but in order to remove the heat generated internally, a fan of forced air cooling cannot be covered by natural convection. Can be installed. In such a situation in which the demand for heat countermeasures becomes strict, the installation location and capacity of the fan significantly change the heat radiation effect, and in the case of natural convection, the arrangement of the heating elements significantly changes the heat radiation effect. Therefore, not only the heat balance but also the thermal design considering the effect of flow has been emphasized.

When a general hot-wire anemometer is used to measure the flow when analyzing the flow in accordance with such requirements, an accurate measurement can be made due to the influence of heat generated by the equipment when the flow velocity is too low. Can not. In addition, since the appearance of a flow changes significantly depending on a few boundary conditions, in a three-dimensional housing in which various parts are installed intricately, it is possible to visualize the actual flow field and visualize the effects of fans etc. It is a sure method to see, but it is impossible to quantitatively grasp the flow state such as the flow velocity at each place, so a tracer such as aluminum powder is flowed in the flow to visualize the flow, A flow measuring device has been commercially available which captures the flow of the tracer with a video camera, captures it in a computer, captures the movement of the tracer at certain time intervals by image processing, and obtains a velocity vector at each part of the flow. For example, "FLOW" from Diesel Equipment Co., Ltd.
VIEWER FV-HS1400 ", Japan Visualization Image Processing System" Current "of Kanomax Co., Ltd.," TSL Visualization Image Processing System "," Quick Measurement "of Applied Measurement Laboratory Co., Ltd.
These are "Vector".

[0004]

However, when a flow is analyzed using particles of aluminum powder or the like as a tracer, the information directly obtained is the information at each point of the tracer, and in order to know the overall flow, I was associated with the velocity vector of each point, and I also performed numerical processing.

[0005]

According to a first aspect of the present invention, there is provided a smoke emission device for emitting smoke into a flow, an illumination device for illuminating the smoke flowing in the flow, and the illumination device illuminated by the illumination device. A visualization imaging device formed with an imaging device that captures smoke, and an image of the flow visualized and captured by this visualization imaging device are captured to capture the movement and shape change of the smoke and quantitatively analyze the flow. The flow measuring device is composed of an image processing device.

According to the second aspect of the present invention, the smoke emission device emits smoke intermittently.

According to the third aspect of the invention, the smoke emitting device and the lighting device are integrated by determining their relative positions.

In the invention according to claim 4, the smoke emitting device and the photographing device are integrated by determining their relative positions.

According to the fifth aspect of the present invention, the device forming the visualization imaging device and the other device are connected by a flexible connection medium.

[0010]

According to the first aspect of the present invention, it is possible to analyze the local flow based on the change in the shape of the smoke and the entire flow based on the movement of the smoke.

According to the second aspect of the invention, the entire flow can be analyzed from the movement of the smoke lump, and
The local flow can be analyzed in more detail from the shape change of the smoke lump.

According to the third aspect of the invention, the smoke emission device and the lighting device can be set at the same time.

According to the fourth aspect of the invention, the smoke emission device and the photographing device can be set at the same time.

According to the fifth aspect of the invention, the device forming the visualizing and photographing device becomes movable.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. First, in the present embodiment, as shown in FIG. 1, a smoke emission device 1 for emitting smoke to a flow field, a lighting device 2 for illuminating the smoke in the flow field, and a video as a photographing device for photographing smoke flowing in the flow field. A visualization photographing device 4 is formed by the camera 3, and a computer 5 as an image processing device is connected to the video camera 3 of the visualization photographing device 4.

Here, the computer 5 includes general peripheral devices such as a hard disk 6, a floppy disk 7, a keyboard 8 and a display 9, and also a frame buffer 10 for a plurality of planes used for image processing. ing.

A video deck 11 for recording and reproducing moving images is connected to the video camera 3 and the computer 5.

A flexible tube 12 is used to supply the smoke emitting device 1 and a smoke generating device 13 for supplying smoke to the smoke emitting device 1.
Are connected, and a power cord 14 connects the lighting device 2 and a power supply device 15 that supplies power to the lighting device 2. Further, the connection of the video camera 3 to the computer 5 and the VCR 11 is made by a transmission cord 16.
Is being done in.

In such a structure, the smoke 17 is caused to flow from the smoke emission device 1 to the flow field, and the smoke 17 is illuminated by the lighting device 2. Then, the smoke 17 flowing in the flow field is photographed by the video camera 3, the images photographed by the video camera 3 are taken into the computer 5 as a still image at a certain time interval, and the smoke 17 between the taken still images is taken. It is possible to correlate the position with the shape by image processing, analyze the overall flow from the amount of movement during the sampling time, and obtain the velocity vector of each part from the change in shape.

When a moving image is recorded on the video deck 11, the analysis can be performed later, and the sampling can be repeated for a continuous time, so that the sampling time can be substantially lengthened.

As a modified example, if the smoke emission device 1 emits smoke intermittently, the entire flow can be analyzed from the movement amount of the smoke lump 18 as shown in FIG. The velocity vector of each part can be obtained in more detail from the change in shape.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those shown in the above-mentioned embodiments are designated by the same reference numerals (the same applies to the following embodiments). In this embodiment, the smoke emission device 1 and the illumination device 2 are integrated so that the smoke emission direction and the illumination direction are the same.

According to such a configuration, the smoke emission device 1 and the illumination device 2 can be positioned at the predetermined positions at the same time, and the emission direction and the illumination direction are already aligned, which facilitates the setting. It is especially effective for setting by inserting the end of a long rod inside a narrow device and inserting it.

Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, instead of the smoke emitting device 1 and the lighting device 2 integrated in the previous embodiment, the smoke emitting device 1 and the video camera 3 are integrated with the smoke emitting direction and the photographing direction being the same. ing.

According to this structure, setting is easy as in the above-mentioned embodiment, and setting is possible in a narrow space such as inside the equipment where a hand cannot be directly inserted like the above-mentioned embodiment. Especially easy.

Next, a fourth embodiment of the present invention will be described with reference to FIG. A light source device (not shown) is not built in the lighting device 2 of the present embodiment, and the light source device provided outside and the lighting device 2 are connected by a flexible optical fiber cable 19 serving as a flexible connection medium. There is. Further, no image pickup tube or CCD (not shown) is built in the image pickup apparatus 3, and the image pickup tube or CCD provided outside is connected to the image pickup apparatus 3 by a flexible optical fiber cable 19 serving as a flexible connection medium. Has been done.

According to this structure, the lighting device 2 and the photographing device 3 can be moved freely, and the lighting device 2 and the photographing device 3 can be made small in size. It can be set to.

[0028]

According to the first aspect of the present invention, the smoke emission device for emitting smoke into the flow, the illumination device for illuminating the smoke flowing in the flow, and the smoke illuminated by the illumination device are provided. A visualization imaging device formed with an imaging device for imaging, and image processing that captures an image of the flow visualized and photographed by the visualization imaging device to capture the movement and shape change of the smoke and quantitatively analyze the flow. Since it is a flow measurement device consisting of a device, it is possible to analyze the local flow from the shape change of smoke and the entire flow from the movement of smoke, so that advanced analysis can be performed. Become.

According to the second aspect of the present invention, since the smoke emission device emits smoke intermittently, the entire flow can be analyzed from the movement of the smoke lump, and the shape of the smoke lump can be analyzed. From the change, the local flow can be analyzed in more detail, and more sophisticated analysis can be performed.

According to the third aspect of the present invention, since the smoke emitting device and the lighting device are integrated by setting their relative positions, the setting of the smoke emitting device and the setting of the lighting device need only be performed once, and the setting is easy. Therefore, the setting becomes particularly easy in a place where the hand cannot be directly inserted.

According to the fourth aspect of the present invention, since the smoke emitting device and the photographing device are integrated by setting their relative positions, the setting of the smoke emitting device and the setting of the photographing device only have to be done once, and the setting is easy. Therefore, the setting becomes particularly easy in a place where the hand cannot be directly inserted.

According to the fifth aspect of the present invention, since the device forming the visualization imaging device and the other device are connected by a flexible connection medium, the device forming the visualization imaging device can be moved freely. , The freedom of setting increases.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing movement and deformation of a smoke lump generated intermittently.

FIG. 3 is a block diagram showing a visualization photographing device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a visualization photographing device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a setting state of a visualization photographing device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Smoke emitting device 2 Illumination device 3 Imaging device 4 Visualization imaging device 5 Image processing device 12, 14, 16, 19 Flexible connection medium 17 Smoke

Claims (5)

[Claims] 1. A smoke emission device for emitting smoke into a flow, a lighting device for illuminating the smoke flowing in the flow, and a photographing device for photographing the smoke illuminated by the lighting device. A flow characterized by comprising a visualization imaging device and an image processing device that captures an image of the flow visualized and photographed by the visualization imaging device to capture the movement and shape change of the smoke and quantitatively analyze the flow. measuring device. 2. The flow measuring device according to claim 1, wherein the flow measuring device is a smoke emitting device which emits smoke intermittently. 3. The flow measuring device according to claim 1, wherein the smoke emitting device and the illuminating device are integrated by determining their relative positions. 4. The flow measuring device according to claim 1 or 2, wherein the smoke emission device and the photographing device are integrated by determining their relative positions. 5. The flow measuring device according to claim 1, 2, 3, or 4, wherein the device forming the visualization imaging device and another device are connected by a flexible connection medium.