JPH10293083A - Breeze air current control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a test precision and efficiency by, relating to a breeze air current control device, controlling a speed distribution in width direction of air current in the air course at will for change, keeping an even speed distribution at always, and controlling increase/decrease of wind speed according to air current condition in the air course at a measurement part. SOLUTION: A breeze air current control device comprises at least one separator means 14 which partitions an air course 22a of an air current 7 into plural division air courses 14a, a wind speed detecting means 12 which detects the wind speed of the air current 7 in the air course 22a, and an open-degree control means 13 which, based on the wind speed detected with the wind speed detecting means 12, controls the open degree of each division wind course 14a so that the wind speed distribution of air current passing each division wind course 14a is a desired distribution 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a micro wind speed air flow control device which can be used, for example, in an experiment for predicting atmospheric environment.

[0002]

2. Description of the Related Art For example, when the height of a chimney of a power plant or the like is not sufficient, it is necessary to pay attention to the interference between the flue gas discharged from the chimney and surrounding buildings. Therefore, it is conceivable to examine the effect of smoke emission from the chimney on the surrounding environment by wind tunnel experiments. By the way, when examining the influence of the flue gas from the chimney on the surrounding environment by a wind tunnel experiment, it is necessary to reproduce the rising process of the flue gas from the chimney using tracer gas such as smoke in the wind tunnel. At this time, the wind speed in the wind tunnel is 1 m / s or less, based on similar conditions.

FIG. 4 is a plan sectional view of a conventional fine wind tunnel, and FIG.
FIG. 6 is a plan sectional view of a conventional fine wind tunnel different from that of FIG.

[0004] First, in FIG. 4, a position on the upstream side of the wind tunnel measurement unit 02, that is, on the upstream side of the wind tunnel measurement unit 02 and the downstream side of the wind tunnel measurement unit 02, on the downstream side of the wind tunnel measurement unit 02, formed in the wind tunnel measurement chamber 01 on the wind path of the wind tunnel 012. , A plurality of airflow adjusting structures 013 each configured so that the honeycomb structure 04 is sandwiched between two pieces of punching metal 03 in a sandwich state, for example, two sheets as shown in FIG. Installed. A suction fan 06 is disposed on the downstream side of the wind measurement chamber 01, that is, on the downstream side, via a bell mouth 05. The suction fan 06 draws air into the wind tunnel 012 to generate an airflow 07. , Generated airflow 0
7 can be introduced into the wind tunnel measurement unit 02.

[0005]

In the conventional wind tunnel shown in FIG. 4, when the wind speed in the wind tunnel is about several tens of centimeters per second, the air flow 07 in the wind tunnel measuring chamber 01 of the wind tunnel 012 is affected by disturbance. For example, as shown in FIG. 5, the wind tunnel measurement unit 02 should normally have the wind tunnel measurement chamber 01 due to disturbance such as imbalance of the flow rate in the circumferential direction at the suction port of the suction fan 06 and the influence of the external wind at the time of strong wind. The speed distribution 08 to be uniform in the width direction of the
This distorted velocity distribution 09 causes undesirable phenomena such as flue gas drift.

As a countermeasure against the above-mentioned drift, as shown in FIG.
It is conceivable to dispose the airflow control box 011 to which the resistor 010 is attached before and after so as to cross the cross section of No. 1; however, the work of mounting the airflow control box 011 takes time and effort.
If the airflow becomes unbalanced after installation, it is necessary to remove the entire airflow control box 011 and adjust the resistor 010 again.

In order to solve the above-mentioned problems, the present invention makes it possible to freely control and change the velocity distribution in the width direction of the air flow in an air path such as a wind tunnel, and to control the velocity distribution in the width direction of the air flow due to disturbance or the like. Even if distortion occurs in the velocity distribution of, by controlling the velocity distribution of the airflow, it is possible to always maintain an even velocity distribution, as a result,
It is possible to prevent undesired phenomena such as smoke emission or tracer gas drift from occurring in the measurement section on the air path such as when the velocity distribution of the air flow is distorted, and furthermore, according to the state of the air flow on the air path. It is another object of the present invention to provide a fine wind speed airflow control device capable of realizing improvement of the accuracy and efficiency of an experiment by controlling the increase and decrease of the wind speed.

[0008]

In order to solve the above-mentioned problems, a fine wind speed airflow control device of the present invention comprises at least one partitioning means for dividing an air passage into a plurality of divided air passages, Wind speed detection means for detecting the wind speed, based on the wind speed detected by the wind speed detection means, so that the distribution of the wind speed of the airflow passing through each of the divided wind paths is a desired distribution,
An opening control means for controlling the opening of each of the divided air paths is provided for each of the divided air paths.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan sectional view of a breeze airflow control device according to an embodiment of the present invention, FIG. 2 is an enlarged plan sectional view of an essential part of the breeze airflow control device of FIG. 1, and FIG. It is a typical principal part enlarged side sectional explanatory view for demonstrating the division | segmentation airway opening control system in a control apparatus.

Referring to FIGS. 1 to 3, a wind tunnel measurement chamber 1 having a wind tunnel measurement section 2 is formed on an air passage 22a of a wind tunnel 22. At the side position and the downstream side, i.e., the downstream side, a plurality of airflow adjusting structures 23 each configured so that the honeycomb structure 4 is sandwiched between two punched metals 3, for example, FIG.
2 and two as shown in FIG. A suction fan 6 is disposed downstream of the measurement chamber 1, that is, downstream of the measurement chamber 1 via a bell mouth 5. The suction fan 6 sucks air into the wind tunnel 22 to generate an air flow 7, and the wind tunnel measurement is performed. The unit 2 is configured to reproduce a predetermined wind speed.

In the wind tunnel 22, at least one, for example, the air passage 22a that divides the air passage 22a into a plurality of divided air passages 14a.
And a plurality of anemometers or the like arranged in parallel with each other in the transverse direction of the air passage 22a to detect the wind speed of the airflow 7 in the air passage 22a. Based on the wind speed detecting means 12 and the wind speed detected by the wind speed detecting means 12, the distribution of the wind speed of the airflow passing through each of the divided air passages 14a becomes a desired distribution, that is, for example, by the solid line in FIG. As shown in the figure, when an uneven speed distribution 9 is generated in the transverse direction of the air path 22a, the speed distribution becomes immediately as uniform as possible in the transverse direction of the air path 22a as shown by a speed distribution 8 indicated by a dotted line. An opening control means 13 such as a rotating plate-shaped damper for controlling the opening degree of each divided air path 14a for each divided air path 14a, for example, is controlled to rotate about a vertical rotation axis 21. .

A wind speed detecting means 12 comprising a plurality of anemometers and the like arranged at intervals in the transverse direction of the air passage 22a.
Are arranged along a representative point in the transverse direction, that is, the width direction in the wind tunnel measurement unit 2 of the wind tunnel measurement chamber 1. As shown in FIG. 3, the wind speed detector 12 such as an anemometer is electrically connected to a wind speed calculator 16, and an output signal of the wind speed calculator 16 is sent to a computer 17. Computer 17
Is sent to the motor driver 18 as a control signal.

On the downstream side of the wind tunnel measuring section 2, between the pair of front and rear airflow adjusting structures 23, at least one, for example, the air passage 22 that divides the air passage 22a into a plurality of divided air passages 14a.
a partitioning means 14 consisting of a partition plate or the like parallel to
a are arranged at an appropriate distance from each other in the transverse direction of FIG. Between each partitioning means 14 composed of the partitioning plate or the like,
Rotating shafts 21 of the opening degree control means 13 such as rotating plate-shaped dampers are supported by wind tunnels 22 via bearings 20 at two upper and lower positions. The rotating shaft 21 extends downward, and is connected via a coupling to an output shaft of a motor 19 whose rotation is controlled by a motor driver 18 at the lower end.

A partitioning means 1 such as a partition plate parallel to the air passage 22a
4 is a support rod 1 extending in a direction crossing the air passage 22a.
5 and fixed to the wind tunnel measurement chamber 1 while being connected to each other at intervals. Since the partitioning means 14 such as a partition plate and the opening control means 13 such as a damper are arranged on the downstream side of the wind tunnel measuring unit 2, the airflow 7 in the wind tunnel measurement chamber 1 is separated from the partitioning means 14 such as the partitioning plate. Also, there is no disturbance by the opening control means 13 such as a damper or the like, so that the measurement in the wind tunnel measuring section 2 is not hindered.

The wind speed measured by the wind speed detecting means 12 such as an anemometer is taken into a computer 17 via a wind speed calculator 16. Here, the average value of the wind speed at each measurement point in the width direction, ie, the transverse direction, of the wind tunnel measurement chamber 1 is calculated, and the difference between the wind speed at each measurement point and the average value of the wind speed in the transverse direction is determined. As a result of the calculation by the wind speed calculator 16, in the opening degree control means 13 such as a damper downstream of the point where the wind speed is higher than the average value, a control signal is sent from the computer 17 to the motor driver 18 to control the rotation of the motor 19. Accordingly, the opening of the opening control means 13 is adjusted in the closing direction, that is, the direction in which the opening decreases.

Contrary to the case described above, as a result of the calculation by the wind speed calculator 16, the opening control means 13 such as a damper downstream of a point where the wind speed is slower than the average value is sent from the computer 17 to the motor driver 18. By transmitting a control signal and controlling the rotation of the motor 19, the opening of the opening control means 13 is adjusted in the opening direction, that is, the direction in which the opening increases.

The partitioning means 14 such as a partitioning plate has the function of controlling the flow of airflow from the periphery into the opening control means 13 such as a damper, and is surrounded by the partitioning means 14 by the presence of the partitioning means 14 such as a partitioning plate. It is possible to accurately control the amount of air flow sucked in the closed space.

[0018]

According to the micro wind speed air flow control device of the present invention,
At least one partitioning means for dividing the air path into a plurality of divided air paths, a wind speed detecting means for detecting a wind speed of an air flow in the air path, and each of the divided winds based on the wind speed detected by the wind speed detecting means. An opening control means for controlling the opening degree of each of the divided air paths is provided for each of the divided air paths so that the distribution of the wind speed of the airflow passing through the path becomes a desired distribution.
It is possible to freely control and change the velocity distribution in the width direction of the airflow on the air path, and even if the velocity distribution in the width direction of the airflow is distorted due to disturbance or the like, by controlling the velocity distribution of the airflow, A uniform velocity distribution can be maintained at all times, thereby preventing the occurrence of undesirable phenomena such as flue gas or tracer gas drift in the measurement section on the wind path, such as when the velocity distribution of the airflow is distorted. Further, by controlling the increase and decrease of the wind speed in accordance with the state of the airflow in the measuring section, it is possible to improve the accuracy and efficiency of the experiment (claim 1).

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a low-velocity airflow control device according to an embodiment of the present invention.

FIG. 2 is an enlarged plan sectional view of a main part of the micro-wind speed airflow control device of FIG. 1;

FIG. 3 is a schematic enlarged sectional side view of a main part for explaining a system for controlling the degree of opening of a divided air passage in the fine wind speed airflow control device of FIG. 1;

FIG. 4 is a plan sectional view of a conventional fine wind tunnel.

FIG. 5 is a plan sectional view of a conventional fine wind tunnel different from FIG. 4;

[Explanation of symbols]

 01 Wind Tunnel Measurement Room 02 Wind Tunnel Measurement Unit 03 Punching Metal 04 Honeycomb Structure 05 Bell Mouth 06 Suction Fan 07 Airflow 08 Desirable Velocity Distribution 09 Distorted Velocity Distribution 010 Resistor 011 Airflow Control Box 012 Wind Tunnel 013 Airflow Adjustment Structure 1 Wind Tunnel Measurement Room 2 Wind tunnel measuring unit 3 Punching metal 4 Honeycomb structure 5 Bell mouth 6 Suction fan 7 Air flow 8 Desirable speed distribution 9 Distorted speed distribution 10 Resistor 11 Air flow control box 12 Wind speed detecting means such as anemometer 13 Opening control means such as damper 14 Partitioning means such as a partition plate 14a Divided air path 15 Support rod 16 Wind speed calculator 17 Computer 18 Motor driver 19 Motor 20 Bearing 21 Rotating shaft 22 Wind tunnel 22a Air path 23 Airflow adjusting structure

Claims (1)

[Claims] At least one partitioning means for dividing an air path into a plurality of divided air paths, a wind speed detecting means for detecting a wind speed of an air flow on the air path, and a wind speed detected by the wind speed detecting means, Opening degree control means for controlling the opening degree of each of the divided air paths for each of the divided air paths such that the distribution of the wind speed of the airflow passing through each of the divided air paths has a desired distribution. Characterized by a micro wind speed air flow control device.