JP2000180296A - Wind tunnel testing method for predicting sea-salt particle scatter amount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wind tunnel testing method for predicting sea-salt particle scatter amount in which the phenomenon of sea-salt particle generation on the seashore can be reproduced by experiment with a model with low cost. SOLUTION: In this method, a mist generator having a spray nozzle 11 is horizontally placed on a windward side floor 12 in the leeward direction. A breakwater model 5 is placed on a leeward side floor 22 in a wind tunnel with a predetermined distance D from the spray nozzle 11. By selecting a type of the spray nozzle 11, the scatter range R of a recreated particle diameter d and a jet stream is adjusted. A mixed jet stream 13 that the mist released from the spray nozzle 11 is mixed with air is collided against the breakwater model 5 with a constant velocity V. After raised to a predetermined height H with an inertia force in the upward vertical direction, the mixed jet stream 13 is scattered while being flowed in the leeward direction by an air stream 15 in the wind tunnel. At the same time, the mixed jet stream 13 is fallen by the effect of gravity to be deposited on the leeward side floor 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind tunnel test method for predicting the amount of scattered sea salt particles by reproducing a sea salt particle generation phenomenon on a coastal area by a model test.

[0002] The present invention is intended to obtain data necessary for designing an environmental assessment such as a windbreak forest effect check and a countermeasure against salt damage of a plant, and a countermeasure for preventing a leak of electricity and corrosion due to adhesion of sea salt particles such as a countermeasure against salt damage of a transmission line. It can be used to predict the amount of sea salt particles scattered.

[0003]

2. Description of the Related Art FIG.

[0004] Sea salt particles are generated by white waves in the open sea and by seashore splashes. Near the coast, most of the salt concentration in the air is caused by seashore splashes.

As a method of reproducing this phenomenon on a terrain model in a wind tunnel, conventionally, as shown in FIG. 4, a mist 3 generated by a mist generator 1 such as a humidifier and an aomizer is branched by a pipe 2. In general, a method of simultaneously discharging from a large number of discharge tubes 4 is used.

[0006]

The prior art has the following problems. (1) In the conventional method, a mist having a large particle diameter adheres in the middle of a pipe, and it is difficult to discharge the mist having a large particle diameter. (2) Also, in order to generate mist 3, as in the case of the breakwater model 5 on the coast, a large number of discharge pipes 4 need to be installed on the terrain model. Needed time and expense.

The object of the present invention is to provide a method which can solve these problems.

[0008]

Means for Solving the Problems (First Means) A method for predicting the amount of sea salt particles scattered in a wind tunnel for reproducing sea salt particle generation phenomena in a coastal area by a model test according to the present invention comprises the steps of: The mist generator 1 having the spray nozzle 11 is installed horizontally on the leeward floor surface 12 in the leeward direction, and (B) the spray nozzle 11 is placed on the leeward floor surface 22 in the wind tunnel 6.
And (C) selecting the type of the spray nozzle 11 to adjust the reproduction particle diameter d and the diffusion range R of the jet, and (D) adjusting the spray The mixed jet 13 of mist 3 and air discharged from the nozzle 11 collides with the breakwater model 5 at a constant speed V, and is raised vertically to a certain height H by an inertial force. While being diffused while flowing in the direction, it is settled under the influence of gravity and deposited on the leeward floor surface 22. (Second Means) The wind tunnel experiment method for predicting the amount of sea salt particles scattered based on the present invention, which reproduces the phenomenon of generating sea salt particles at the coastal area by a model experiment, is as follows. The mist generator 1 having the nozzle 11 is installed horizontally in the leeward direction, and (B) on the leeward floor surface 22 in the wind tunnel 6,
The breakwater model 5 is installed so as to have a certain distance D from the spray nozzle 11, and the terrain model 16 is installed so as to have a certain distance S on the lee side from the breakwater model 5. (C) The spray nozzle By selecting the type 11, the reproduction particle size d and the diffusion range R of the jet are adjusted. (D) The mixed jet 13 of the mist 3 and the air discharged from the spray nozzle 11 is supplied to the breakwater at a constant velocity V. The model 5 is caused to collide with the model 5 and a constant height H is vertically upward by inertia force.
After being lifted up, it is diffused while being swept downwind by the air current 15 in the wind tunnel, and at the same time, it sinks under the influence of gravity.
It is characterized by being deposited on the terrain model 16. (Third Means) In the wind tunnel experiment method for predicting the amount of sea salt particles scattered according to the present invention, (A) the mist 3 deposited on the terrain model 16 is transferred to the test tube 20 via the suction pipe 19 in the second means. Aspirate, dissolve and collect in aspirating solution 21 in test tube 20,
(B) The amount of salt in the air is estimated by quantitatively analyzing the amount of salt in the suction liquid 21. (Fourth Means) In the wind tunnel experiment method for predicting the amount of sea salt particles scattered according to the present invention, in the first means to the third means, (A) the spray nozzle 11 is installed below the mist mixing box 31;
(B) After the jet velocity of the mixed jet 13 of the mist 3 and the air is reduced by the mist mixing box 31, (C) the mist 3 is discharged at a low speed from the upper opening 32 of the mist mixing box 31. It is characterized by. (Fifth Means) In the wind tunnel experiment method for predicting the amount of sea salt particles scattered according to the present invention, in the first means to the fourth means, the distance D between the spray nozzle 11 and the breakwater model 5 is adjusted. The height H of the mist 3 is adjusted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a first embodiment of the present invention.

In the first embodiment, a spray nozzle 11 is used as the mist generator 1, and mist is finally deposited on the leeward floor surface 22.

In the method of the first embodiment, the spray nozzle 11 is installed on the windward floor surface 12 of the breakwater model 5 in a horizontal leeward direction.

The mixed jet 13 of air and mist 3 discharged from the spray nozzle 11 collides with the breakwater model 5 at a certain speed V, and is vertically upward by an inertia force at a certain height H.
To rise.

Thereafter, the mist 3 is diffused while flowing in the leeward direction by the air current 15 in the wind tunnel, and at the same time, sinks under the influence of gravity, and finally deposits on the leeward floor surface 22. (A) Adjustment of mist rising height In this case, the distance D between the spray nozzle 11 and the breakwater model 5
Is increased, the collision speed V decreases, and the vertical upward rising height H decreases.

Therefore, the height H of the mist 3 can be adjusted by adjusting the distance D between the spray nozzle 11 and the breakwater model 5. (B) Adjustment of Reproducible Particle Diameter and Jet Diffusion Range By selecting the type of the spray nozzle 11, the reproduction particle diameter d and the jet diffusion range R can be adjusted. (C) If a spray nozzle in which the jet diffuses in a fan shape is used, approximately one spray nozzle is arranged for every 50 cm in the horizontal direction, so that the air salt concentration is uniform in the horizontal direction (lateral wind direction). Can be reproduced.

According to this method, it is possible to reproduce the situation of the outdoor spraying with a few spray nozzles, and it is possible to reduce the cost of apparatus preparation and control as compared with the conventional method. (Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
Shown in

In the second embodiment, a spray nozzle 11 is used as the mist generating device 1, and a mist is finally deposited on the terrain model 16.

In the second embodiment, the mist 3 collides with the breakwater model 5, flows downwind by the wind current 15 in the wind tunnel, spreads, settles, and deposits on the model 16 on the lower surface of the wind tunnel.

Then, the mist 3 to be deposited is transferred to the suction pipe 19.
The liquid is sucked by a suction device 18 connected to a discharge pipe 17 through a suction pipe, and is dissolved and collected in a suction liquid 21 in a test tube 20.
By quantitatively analyzing the amount of salt in 1, the concentration of aerial salt can be estimated. (Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
Shown in

FIG. 3 shows a method in which the mist 3 discharged from the spray nozzle 11 is once mixed with air in the mist mixing box 31 and then discharged from the upper slit 32 of the box.

The spray nozzle 11 is installed below the mist mixing box 31 to discharge the mist 3 from the spray nozzle 11 and reduce the jet velocity of the mist 3 and air mixed jet 13. From the upper opening 32 at a low rate.

Therefore, the phenomenon of diffusion in the atmosphere can be reproduced without raising the mist 3.

Such a phenomenon corresponds to a low wind speed of 5 m / s or more in the field where no wave is generated at the breakwater.

[0023]

Since the present invention is configured as described above, it has the following effects. (1) By selecting the type of spray nozzle, it is possible to adjust the reproduced particle diameter d and the diffusion range R of the jet. (2) If a spray nozzle is used, in which the jet diffuses in a fan shape, a uniform salt concentration in the air can be reproduced in the horizontal direction (lateral wind direction).

According to this method, it is possible to reproduce the situation of the occurrence of the outdoor spraying by using several spray nozzles, and it is possible to reduce the cost of preparing and controlling the apparatus as compared with the conventional method. (3) The mist deposited on the topographic model on the lower surface of the wind tunnel is sucked into the test tube via the suction tube, dissolved and collected in the suction solution in the test tube, and the amount of salt in the suction solution is quantitatively analyzed. The salt concentration in the air can be estimated. (4) By using the mist mixing box, the discharge speed of the mist 3 can be reduced.

Therefore, the phenomenon of diffusion in the air can be reproduced without raising the mist.

Such a phenomenon corresponds to a low wind speed of 5 m / s or more in the field where no wave splash occurs at the breakwater. (5) The height H of the mist can be adjusted by adjusting the distance D between the spray nozzle and the breakwater model.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a method according to a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mist generator 2 ... Piping 3 ... Mist 4 ... Discharge pipe 5 ... Break breakwater model 6 ... Wind tunnel 11 ... Spray nozzle 12 ... Wind-side floor 13 DESCRIPTION OF SYMBOLS 17 ... Discharge pipe 18 ... Suction device 19 ... Suction pipe 20 ... Test tube 21 ... Suction liquid 22 ... Downstream floor surface 31 ... Mist mixing box 32 ... Upper opening (upper slit)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsuyoshi Nonaka 5-717-1, Fukabori-cho, Nagasaki-shi, Nagasaki F-term in Nagasaki Research Laboratory, Mitsubishi Heavy Industries, Ltd. (Reference) 2G023 AA01 AB02 AB07 AB12 AB21 AB24 AC03 AC04 AD09

Claims (5)

[Claims] (A) A mist generator having a spray nozzle is installed horizontally on a leeward floor surface in a wind tunnel in a leeward direction, and (B) the spray device is installed on a leeward floor surface in the wind tunnel. A breakwater model is installed so as to have a certain interval from the nozzle, and (C) the type of the spray nozzle is selected to adjust the reproduction particle size and the diffusion range of the jet,
(D) The mixed jet of the mist and air discharged from the spray nozzle is caused to collide with the breakwater model at a constant speed, and to rise vertically upward to a certain height by inertia force.
Sea salt that reproduces the phenomenon of sea salt particle generation at the coastal area by model experiments, characterized by being diffused while being swept downwind by the wind current in the wind tunnel, and simultaneously settling under the influence of gravity and depositing on the leeward floor Wind tunnel experiment method for predicting particle scattering amount. 2. (A) A mist generator having a spray nozzle is installed horizontally on the leeward floor surface in the wind tunnel in a leeward direction, and (B) the spray device is installed on the leeward floor surface in the wind tunnel. By installing the breakwater model so as to have a certain distance from the nozzle, and installing the terrain model so as to have a certain distance on the leeward side from the breakwater model, and (C) selecting the type of the spray nozzle, The reproduced particle size and the diffusion range of the jet are adjusted, and (D) the mixed jet of the mist and air discharged from the spray nozzle collides with the breakwater model at a constant speed, and a predetermined height is set vertically upward by inertia force. After being raised to the point, it is diffused while flowing downwind by the wind current of the wind tunnel, and at the same time, it sinks under the influence of gravity,
A wind tunnel test method for predicting the amount of sea salt particles scattered, wherein a sea salt particle generation phenomenon at a coastal area is deposited on the terrain model by a model test. (A) a mist deposited on the terrain model,
Aspirating into a test tube via a suction tube, dissolving and collecting in a suction solution in the test tube, and (B) estimating a salt concentration in the air by quantitatively analyzing a salt amount in the suction solution. The wind tunnel experiment method for predicting the amount of sea salt particles scattered according to claim 2. 4. A spray nozzle is provided at a lower portion of a mist mixing box, and (B) a jet velocity of a mixed jet of the mist and air is reduced by the mist mixing box. The method according to claim 1, wherein the mist is discharged at a low speed from an upper opening of the box. 5. The sea salt particle scattering amount prediction according to claim 1, wherein the rising height of the mist is adjusted by adjusting an interval between the spray nozzle and the breakwater model. Wind tunnel experiment method.