JP2016102678A - Air flow observation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smoking device capable of observing an air flow around an observation object at high flow velocity, and to provide an air flow observation device including the same.SOLUTION: A smoking device 1 is used for generating smoke by heating a smoking agent. The smoking device 1 includes: a frame member 2; a wire member 3 coated with the smoking agent, and stretched on the frame member 2 so as to extend in a flowing direction of smoke; and a voltage application device 4 capable of applying a voltage to the wire member 3 so as to generate smoke by heating the smoking agent.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a smoke generation device and an airflow observation device, and more particularly to a smoke generation device for generating smoke by raising the temperature of a smoke generating agent and an airflow observation device including the smoke generation device.

  Conventionally, there is a smoke wire method as a method of observing the airflow around the observation object. In the smoke wire method, a smoke generating agent is applied to the outer periphery of a thin metal wire stretched in a direction orthogonal to the airflow. When the fine metal wire coated with the smoke generating agent is energized and generates heat, the smoke generating agent is heated to generate smoke. The smoke is mixed into the airflow, thereby visualizing the airflow. The visualized airflow is caused to flow around the observation object, whereby the airflow around the observation object is observed. The smoke wire method is disclosed in, for example, Japanese Patent Laid-Open No. 5-264497 (Patent Document 1).

Japanese Patent Laid-Open No. 5-264497

  However, in the above-described smoke wire method, when the flow velocity of the airflow is high, the time for smoke to flow around the observation object is shortened. Furthermore, since the fine metal wires are stretched in a direction orthogonal to the flow of the airflow, the generated smoke is mixed into the airflow and flows around the object to be observed instantaneously. Therefore, the observable airflow velocity is limited to about 4 m / s. Therefore, with the smoke wire method, it is difficult to observe the airflow around the observation object at a high flow rate.

  This invention is made | formed in view of the said subject, The objective is to provide the smoke generation apparatus which can observe the airflow around an observation target object at high flow velocity, and an airflow observation apparatus provided with the same. is there.

  The smoke generating device of the present invention is for heating a smoke generating agent to generate smoke. The smoke generating device includes a frame member, a wire member that is coated with a smoke generating agent and stretched in a direction in which the smoke flows, and a wire member that generates smoke by heating the smoke generating agent. A voltage applying device capable of applying a voltage.

  According to the smoke generating device of the present invention, since the wire member is stretched on the frame member so as to extend in the direction in which the smoke flows, the smoke can be generated so as to extend in the direction in which the smoke flows. Therefore, since the smoke extends in the direction in which the smoke flows, it is possible to lengthen the time for the smoke to flow around the object to be observed even if the smoke is mixed in an air flow having a high flow velocity. Thereby, the airflow around the observation object can be observed at a high flow rate.

  In the smoke generating device, the wire member includes a plurality of wires. For this reason, since the quantity of the smoke generating agent apply | coated to a wire increases, the generation amount of smoke can be increased. Therefore, the amount of smoke flowing around the observation object can be increased. Thereby, even if smoke is mixed in the airflow at a high flow rate, the time for the smoke to flow around the observation object can be lengthened, so that the airflow around the observation object can be observed at a high flow rate.

  In the above smoke generator, the wire member includes a stranded wire. For this reason, since a smoke generating agent can be infiltrated into a strand wire, it can suppress that a smoke generating agent blows off by the airflow of a quick flow velocity. Therefore, it is possible to suppress a decrease in the amount of smoke generated.

  In the smoke generating device, the frame member includes a plurality of frames. The plurality of frames are assembled so as to form a rectangular parallelepiped frame. The wire member is disposed at the center of the frame when viewed from the direction intersecting the longitudinal direction of the rectangular parallelepiped frame. For this reason, since smoke flows through the center of the frame, the smoke can flow smoothly. Therefore, the generated smoke can be effectively flowed around the observation object.

  In the above smoke generator, the smoke generator contains liquid paraffin and iron powder. When the liquid paraffin is applied to the wire member, the liquid paraffin condenses into a spherical shape, and thus may be blown off from the wire member by an air current. It is possible to suppress the liquid paraffin from being blown off from the wire member by mixing the iron powder with the liquid paraffin. Thereby, the fall of the generation amount of smoke can be suppressed. Moreover, since iron powder is mixed with the liquid paraffin smoke, the smoke can be easily seen.

  The smoke generating device further includes a spring member. The spring member is configured to pull the wire member along the direction in which the smoke flows. For this reason, it can suppress that a wire member droops by heat_generation | fever with a spring member. Therefore, it can suppress that the height position where smoke generate | occur | produces by a wire member dripping falls. Therefore, the height at which the smoke S is generated can be stabilized.

  An airflow observation device of the present invention is an airflow observation device for observing an airflow around an observation object, and is configured to be able to blow air into the above-described smoke generation device, a wind tunnel that can accommodate the smoke generation device, and the wind tunnel. And a smoke generator flowing upstream of the wire member in the direction in which the smoke flows and flowing around the observation object arranged downstream of the wire member in the direction of the smoke flow by the blower and the air blown from the blower And a photographing device capable of photographing.

  According to the airflow observation device of the present invention, since the smoke generation device is provided, the airflow around the observation object can be photographed at a high flow rate.

  Said airflow observation apparatus is further provided with the illuminating device. The illumination device is arranged so as to be able to irradiate the observation object. Since light and shade are generated in the image taken by irradiating the observation object, the airflow can be easily observed. In addition, the airflow can be accurately observed by observing the light and shade movement.

  As described above, according to the smoke generating device and the airflow observation device of the present invention, the airflow around the observation object can be observed at a high flow rate.

It is a perspective view which shows roughly the structure of the smoke generator in one embodiment of this invention. It is a front view which shows roughly the structure of the smoke generator in one embodiment of this invention. It is a side view which shows roughly the structure of the smoke generator in one embodiment of this invention. It is an enlarged view which expands and shows the P1 part of FIG. It is a perspective view which shows roughly the state which smoke generate | occur | produced in the smoke generator in one embodiment of this invention. It is a perspective view which shows roughly the structure of the airflow observation apparatus in one embodiment of this invention. It is a figure which shows the relationship between the smoke generation time in an Example, and the flow velocity.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, the structure of the smoke generator of the present embodiment will be described. The smoke generating device of the present embodiment is a device for generating smoke by heating a smoke generating agent. When the airflow mixed with the smoke flows around the observation object, the airflow around the observation object can be observed.

  With reference to FIG. 1, the smoke generating apparatus 1 of this Embodiment is the frame member 2, the wire member 3, the 1st support wire 3f, the 2nd support wire 3s, the voltage application apparatus 4, and a spring. It mainly has the member 5.

  The frame member 2 is formed in a rectangular parallelepiped shape. Specifically, the frame member 2 includes a plurality of frames 2a and connection members 2b that connect the frames 2a. The plurality of frames 2a are assembled so as to form a rectangular parallelepiped frame. The rectangular parallelepiped frame has a length of, for example, 850 mm or more and 950 mm or less, a height of 350 mm or more and 450 mm or less, and a width of 350 mm or more and 450 mm or less. Each frame 2 a constitutes each side of the rectangular parallelepiped of the frame member 2. Each frame 2a has a cylindrical shape. The diameter of each frame 2a is, for example, 5 mm or more and 6 mm or less.

  The frame member 2 is arranged such that the longitudinal direction of the frame member 2 is along the direction F1 in which smoke flows. That is, the longitudinal direction of the frame member 2 is arranged along the direction in which the airflow mixed with smoke flows. The frame member 2 is made of wood, for example.

  The frame member 2 has a frame portion 2 f that can move along the longitudinal direction of the frame member 2. The frame portion 2f is configured in an annular shape, and includes four frames 2a and four connection members 2b. The four connection members 2b of the frame portion 2f are connected to each of the four frames 2a extending in the longitudinal direction of the frame member 2. The four frames 2a of the frame portion 2f are respectively connected to connection members 2b connected to adjacent frames 2a of the four frames 2a extending in the longitudinal direction of the frame member 2.

  With reference to FIG. 1 and FIG. 2, a first support wire 3 f is attached to one end of the frame member 2 in the longitudinal direction. 2 is a view seen from the direction of arrow A1 in FIG. An arrow A1 direction is a direction opposite to the direction F1 in which smoke flows. The first support wire 3f is disposed on the downstream side in the direction F1 in which the smoke flows. The first support wire 3 f connects the two frames 2 a extending in the short direction of the frame member 2. Specifically, the first support wire 3f is attached to the two upper and lower frames 2a so as to extend in the vertical direction at one end in the longitudinal direction of the frame member 2. The first support wire 3f is, for example, a copper wire. The diameter of the first support wire 3f is, for example, not less than 0.1 mm and not more than 0.8 mm.

  With reference to FIGS. 1 and 3, a frame portion 2 f is disposed on the other end side in the longitudinal direction of the frame member 2. 3 is a view seen from the direction of arrow A2 in FIG. The arrow A2 direction is a direction orthogonal to the direction F1 in which the smoke flows. A second support wire 3s is attached to the frame portion 2f. The second support wire 3s is disposed so as to face the first support wire 3f. The second support wire 3s is disposed on the upstream side in the direction F1 in which the smoke flows. The second support wire 3 s connects the two frames 2 a of the frame portion 2 f extending in the short direction of the frame member 2. Specifically, the second support wire 3s is attached to the two upper and lower frames 2a so as to extend in the vertical direction in the frame portion 2f. The second support wire 3s is, for example, a copper wire. The diameter of the second support wire 3s is, for example, not less than 0.2 mm and not more than 0.4 mm. This dimension is the dimension of the largest diameter part.

  The wire member 3 is stretched on the frame member 2 so as to extend in the direction F1 in which smoke flows. Specifically, the wire member 3 is connected to the first support wire 3f and the second support wire 3s. The wire member 3 is disposed at the center of the rectangular parallelepiped frame as seen from the direction intersecting the longitudinal direction of the rectangular parallelepiped frame.

  The wire member 3 has a plurality of wires 3a. The plurality of wires 3a are arranged side by side in the vertical direction. The plurality of wires 3a may be arranged at equal intervals or may be arranged at unequal intervals. There is no restriction | limiting in the number of the some wire 3a, for example, is 5 or more and 20 or less. The wire 3a is, for example, a stainless wire. The diameter of the wire 3a is, for example, not less than 0.5 mm and not more than 0.6 mm. There is no restriction | limiting in the length of the wire 3a, For example, they are 750 mm or more and 850 mm or less. When the smoke generating device 1 is installed in the wind tunnel, if the end of the wire 3a is supported sufficiently upstream in the wind tunnel, the turbulent flow generated at the end of the wire 3a can be reduced in a long flow-down process.

  With reference to FIG. 4, the wire member 3 has a stranded wire. Specifically, the plurality of wires 3a are composed of stranded wires. FIG. 4 is an enlarged side view showing the wire member 3. The wire member 3 is, for example, a stainless steel wire or a tungsten wire.

  A smoke generating agent 10 is applied to the wire member 3. Specifically, the smoke generator 10 is applied to the wire member 3 with a brush, for example. The smoke generating agent 10 is mainly composed of liquid paraffin 10a. The smoke generating agent 10 includes liquid paraffin 10a and iron powder 10b. In addition, instead of the iron powder 10b or in addition to the iron powder 10b, clay such as aluminum powder, silver powder or kaolin clay may be mixed in the smoke generating agent 10. Further, the “smoke” in the present invention is not limited to a mist shape, and may be a dust shape or a fume shape depending on the type of the smoke generating agent 10.

  Referring to FIGS. 1 and 3 again, the voltage applying device 4 is configured to be able to apply a voltage to the wire member 3 so as to generate smoke by heating the smoke generating agent 10. The voltage application device 4 is electrically connected to the wire member 3. The voltage application device 4 is configured to be able to apply a voltage of, for example, about 50 V to the wire member 3.

  The frame portion 2 f is connected to a spring member 5 connected to the other end in the longitudinal direction of the frame member 2. The spring member 5 is configured to pull the wire member 3 along the direction F1 in which smoke flows. Specifically, the spring member 5 is configured to urge the frame portion 2 f to the other end in the longitudinal direction of the frame member 2. The eight spring members 5 urge the frame portion 2f. Two spring members 5 are connected between the frame 2a at the other end in the longitudinal direction of the frame member 2 and the frame 2a of the frame portion 2f facing them. These two spring members 5 may be connected to positions that equally divide each side of the rectangular parallelepiped.

Then, with reference to FIG. 5, operation | movement of the smoke generator of this Embodiment is demonstrated.
First, the smoke generating agent 10 is applied to the wire member 3. A voltage is applied by the voltage application device 4 to the wire member 3 to which the smoke generating agent 10 is applied. When the wire member 3 is energized, the wire member 3 generates heat. When the wire member 3 generates heat, the smoke generating agent 10 is made mist and smoke S is generated. Smoke S is generated along the wire member 3. For this reason, the smoke S is generated according to the length of the wire member 3 along the direction F1 in which the smoke flows. Smoke S is also generated in the vertical direction because the plurality of wires 3a are arranged in the vertical direction. Therefore, the smoke S is generated in the longitudinal direction and the short direction of the frame member 2. That is, the smoke S is generated three-dimensionally so as to extend in the longitudinal direction of the frame member 2 around the wire member 3.

Next, the structure of the airflow observation device of the present embodiment will be described.
The airflow observation device of the present embodiment is a device for observing the airflow around the observation object. As the observation object, for example, a golf ball or a baseball can be applied. By observing the airflow around the golf ball and the baseball, it is possible to know the mechanism by which the aerodynamic force of the flying ball acts. The airflow observation apparatus of the present embodiment can perform PIV (Particle Image Velocimetry) analysis.

  With reference to FIG. 6, the airflow observation device 20 mainly includes the smoke generation device 1, the wind tunnel 21, the blower 22, the imaging device 23, and the illumination device 24. The observation object 30 is disposed downstream of the smoke generating device 1 in the direction in which the airflow flows.

  The wind tunnel 21 is configured to accommodate the smoke generating device 1. The wind tunnel 21 is configured to flow an air flow in the longitudinal direction of the frame member 2 of the smoke generating device 1 in a state where the smoke generating device 1 is accommodated in the wind tunnel.

  The blower 22 is configured to be able to blow air into the wind tunnel. The blower 22 is disposed upstream of the wire member 3 in the direction F1 in which smoke flows. The blower 22 is, for example, a blower fan. The blower 22 is configured to be able to blow at a wind speed of 40 m / s or more.

  The photographing device 23 is configured to be able to photograph the airflow flowing around the observation object 30 arranged on the downstream side of the wire member 3 in the direction F <b> 1 in which the smoke flows by blowing from the blower 22. The imaging device 23 is disposed at a position outside the flow path through which the airflow flows. The photographing device 23 is disposed outside the wind tunnel 21. The photographing device 23 is, for example, a high speed camera. The photographing speed of the photographing device 23 is, for example, a maximum speed of 20000 fps.

  The illumination device 24 is arranged so as to be able to irradiate the observation object 30. Specifically, the illuminating device 24 is disposed downstream of the observation object 30 in the airflow direction. Two illumination devices 24 are arranged so as to irradiate the observation object 30 from above and below the observation object 30. The illumination device 24 is, for example, a set of a metal haloid lamp and a semicircular condenser lens.

Subsequently, the operation of the airflow observation apparatus of the present embodiment will be described.
A smoke generating agent is applied to the wire member 3 of the smoke generating device 1. In the wind tunnel 21, the smoke generating device 1 to which the smoke generating agent is applied is set. In a state where the smoke generating device 1 is set in the wind tunnel, the wind W is blown by the blower 22 so that the flow velocity of the air flow in the wind tunnel becomes a predetermined flow velocity. A voltage is applied to the wire member 3 by the voltage application device 4, and the smoke generating agent is misted to generate smoke S. The air stream mixed with the smoke S is sent around the observation object 30. The light L was applied to the observation object 30 from above and below the observation object 30 by the illumination device 24. The airflow flowing around the observation object 30 is imaged by the imaging device 23. Thereby, the airflow flowing around the observation object 30 is visually observed.

Next, the effect of this Embodiment is demonstrated.
With reference to FIGS. 1, 5, and 6, according to the smoke generating device 1 of the present embodiment, the wire member 3 is stretched on the frame member 2 so as to extend in the direction F <b> 1 in which the smoke flows. Smoke can be generated so as to extend in the direction F1 in which smoke flows. Therefore, since the smoke S extends in the direction F1 in which the smoke flows, it is possible to lengthen the time during which the smoke S flows around the observation object 30 even if the smoke S is mixed in an air flow having a high flow velocity. Thereby, the airflow around the observation object 30 can be observed at a high flow rate. Specifically, dense smoke could be generated around the observation object 30 for about 1 second at an airflow velocity of 40 m / s.

  In the smoke generating device 1 of the present embodiment, the wire member 3 includes a plurality of wires 3a. For this reason, since the quantity of the smoke generating agent with which the wire 3a is applied increases, the generation amount of the smoke S can be increased. Accordingly, the amount of smoke S flowing around the observation object 30 can be increased. Thereby, even if the smoke S is mixed in the airflow at a high flow velocity, the time for the smoke S to flow around the observation object 30 can be lengthened, so that the airflow around the observation object 30 is observed at a high flow velocity. Can do.

  4 and 5, in smoke generator 1 of the present embodiment, wire member 3 includes a stranded wire. For this reason, since the smoke generating agent 10 can be infiltrated in a strand wire, it can suppress that the smoke generating agent 10 blows off with the airflow of a quick flow velocity. Therefore, a decrease in the amount of smoke S generated can be suppressed.

  With reference to FIG. 5 and FIG. 6, in the smoke generating apparatus 1 of the present embodiment, the wire member 3 is disposed at the center of the frame as seen from the direction intersecting the longitudinal direction of the rectangular parallelepiped frame. For this reason, since the smoke S flows through the center of the frame, the smoke S can flow smoothly. Therefore, the generated smoke S can be effectively flowed around the observation object 30.

  With reference to FIG. 4 and FIG. 6, in the smoke generating apparatus 1 of the present embodiment, the smoke generating agent 10 includes liquid paraffin 10a and iron powder 10b. When the liquid paraffin 10a is applied to the wire member 3, the liquid paraffin 10a condenses into a spherical shape, and thus may be blown off from the wire member 3 by an air current. It can suppress that the liquid paraffin 10a is blown off from the wire member 3 by mixing the iron powder 10b with the liquid paraffin 10a. Thereby, the fall of the generation amount of smoke S can be suppressed. Moreover, since the iron powder 10b is mixed with the smoke S of the liquid paraffin 10a, the smoke S can be easily seen.

  With reference to FIG. 1 and FIG. 5, in the smoke generating apparatus 1 of this Embodiment, the spring member 5 is comprised so that the wire member 3 may be pulled along the direction F1 into which smoke flows. For this reason, the spring member 5 can suppress the wire member 3 from dripping due to heat generation. Therefore, it can suppress that the height position where smoke S generate | occur | produces by the wire member 3 dripping falls. Therefore, the height at which the smoke S is generated can be stabilized.

  Referring to FIG. 6, according to the airflow observation device 20 of the present embodiment, since the smoke generation device 1 is provided, the airflow around the observation object 30 can be imaged at a high flow rate.

  In the airflow observation device 20 of the present embodiment, the illumination device 24 is disposed so as to be able to irradiate the observation object 30. Since light and shade are generated in the image taken by irradiating the observation object 30, it is possible to easily observe the airflow. In addition, the airflow can be accurately observed by observing the light and shade movement. Specifically, the movement of the light and shade is traced, image processing is performed by PIV analysis, the velocity vector at each element point is obtained, and the streamline and vorticity distribution of the wake behind the observation object are obtained from the information. Can do.

Examples of the present invention will be described below.
In this example, the airflow observation device 20 shown in FIG. 6 was used to examine the relationship between the airflow velocity and the smoke generation time. The flow velocity of this air flow is the flow velocity of the air flow in the wind tunnel where the smoke generating device 1 is installed. This smoke generation time is the time during which smoke with sufficient strength to withstand photography is realized.

  First, the structure of the airflow observation apparatus 20 of a present Example is demonstrated. Unless otherwise specified, the configuration of the airflow observation apparatus 20 of the present example is the same as that of the airflow observation apparatus 20 of the above-described embodiment.

  The frame member 2 of the smoke generating device 1 has a length of 920 mm, a height of 400 mm, and a width of 400 mm. Each frame 2a has a diameter of 5 mm. The wire member 3 is a stainless steel wire. The length of the wire member 3 is 850 mm. The diameter of the wire 3a is 0.54 mm. The number of wires 3a is nine. The wire 3a is a stranded wire. The first support wire 3f and the second support wire 3s are copper wires. The diameters of the first support wire 3f and the second support wire 3s are each 0.3 mm. Moreover, the smoke generating agent was apply | coated to the wire member 3 of the smoke generating apparatus 1 with a brush. The smoke generator is a mixture of liquid paraffin and iron powder.

  The photographing device 23 is a high-speed camera, and the photographing speed is a maximum speed of 20000 fps. The blower 22 is a blower fan capable of blowing air at a wind speed of 40 m / s or more. The illumination device 24 is a set of a metal haloid lamp and a semicircular condenser lens.

  Subsequently, the operation of the airflow observation apparatus 20 of the present embodiment will be described. Unless otherwise described, the operation of the airflow observation apparatus 20 of the present example is the same as that of the airflow observation apparatus 20 of the above embodiment.

  In the wind tunnel 21, the smoke generating device 1 to which the smoke generating agent was applied was set. With the smoke generating device 1 set in the wind tunnel, the air was blown by the blower 22 so that the flow velocity of the air flow in the wind tunnel was in the range of 5 m / S to 40 m / s. The flow rate of the air flow was set at 5 m / s increments. A voltage was applied to the wire member 3 by the voltage application device 4. As a result, the smoke generating agent was misted to generate smoke. The air stream mixed with the smoke was sent around the observation object 30. The observation object 30 was irradiated from above and below the observation object 30 by the illumination device 24. The airflow flowing around the observation object 30 was photographed by the photographing device 23 at 20000 fps.

  The result is shown in FIG. Referring to FIG. 7, in the airflow observation device of this example, dense smoke could be generated for about 1 second at a flow rate of 40 m / s. For this reason, the airflow flowing around the observation object 30 was observed at a flow velocity of 40 m / s. By increasing the number of wires to 20, for example, it is possible to generate smoke at a level that allows theoretically sufficient PIV analysis even at a flow rate of 80 m / s.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Smoke generator, 2 frame member, 2a frame, 2b connection member, 2f frame part, 3 wire member, 3a wire, 3f 1st support wire, 3s 2nd support wire, 4 voltage application apparatus, 5 spring member, 10 Smoke generating agent, 10a liquid paraffin, 10b iron powder, 20 airflow observation device, 21 wind tunnel, 22 blower, 23 photographing device, 24 illumination device, 30 observation object, F1 direction of smoke flow, L light, S smoke, W wind.

The smoke generating device of the present invention is for heating a smoke generating agent to generate smoke. The smoke generating device includes a frame member, a wire member that is coated with a smoke generating agent and stretched in a direction in which the smoke flows, and a wire member that generates smoke by heating the smoke generating agent. A voltage applying device capable of applying a voltage. An airflow observation device of the present invention is an airflow observation device for observing an airflow around an observation object, and is configured to be able to blow air into the above-described smoke generation device, a wind tunnel that can accommodate the smoke generation device, and the wind tunnel. And a blower arranged upstream of the wire member in the direction of smoke flow, and air flow around the observation object arranged downstream of the wire member in the direction of smoke flow by blowing from the blower. And a photographing device capable of photographing smoke.

Claims (8)

A smoke generating device for generating smoke by heating a smoke generating agent,
A frame member;
A wire member applied to the frame member so that the smoke generating agent is applied and extends in a direction in which the smoke flows;
A smoke generating device comprising: a voltage applying device capable of applying a voltage to the wire member so as to generate the smoke by heating the smoke generating agent.   The smoke generating device according to claim 1, wherein the wire member includes a plurality of wires. The smoke generating device according to claim 1 or 2, wherein the wire member includes a stranded wire. The frame member includes a plurality of frames;
The plurality of frames are assembled to constitute a rectangular parallelepiped frame,
The said wire member is a smoke generator of any one of Claims 1-3 arrange | positioned in the center of the said frame seeing from the direction which cross | intersects the longitudinal direction of the said rectangular parallelepiped frame.   The smoke generator according to any one of claims 1 to 4, wherein the smoke generating agent includes liquid paraffin and iron powder. A spring member;
The smoke generating device according to claim 1, wherein the spring member is configured to pull the wire member along a direction in which the smoke flows. An airflow observation device for observing the airflow around the observation object,
The smoke generator according to any one of claims 1 to 6,
A wind tunnel capable of accommodating the smoke generating device;
The blower is configured to be able to blow air in the wind tunnel, and arranged on the upstream side of the wire member in the direction in which the smoke flows,
An airflow observation apparatus comprising: an imaging device capable of photographing the airflow flowing around the observation object arranged downstream of the wire member in a direction in which the smoke flows by blowing air from the blower. A lighting device;
The airflow observation device according to claim 7, wherein the illumination device is arranged to be able to irradiate the observation object.

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