JP2007199015A - Blowout nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blowout nozzle capable of forming a natural wind in a wind tunnel, without generating noise. <P>SOLUTION: Respective openings 9a and 10a of respective spaces 9 and 10 are closed/opened alternately, by driving respective dampers 14 and 15, internal pressures Pa and Pb in the spaces 9 and 10 are varied at predetermined intervals from an atmospheric pressure P0 to a pressure P1 of an air flow in the vicinity of a blowout port 3, which flows down in a flow path 11; and the direction of the wind, blown out from the port 3, is swung laterally from the nozzle center line C at predetermined intervals. Thus, an air flow, approximating the natural wind, is formed inside the wind tunnel. In addition, a silencing member 16 is provided in the respective spaces 9 and 10, thereby the drive noise of the dampers 14 and 15 is reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blowout nozzle, and more particularly to a blowout nozzle used in a wind tunnel test apparatus.

For example, in a vehicle wind tunnel testing apparatus, a device that generates an air flow in a wind tunnel by narrowing a wind generated by a blower by a blow nozzle provided at a terminal end of a duct and blowing the wind into the wind tunnel is known. (For example, refer to Patent Document 1 or 2.) In such a wind tunnel device, a test vehicle is simulated on a chassis dynamometer installed in the wind tunnel to reproduce the actual running state of the test vehicle, and test data such as motion performance and quietness is collected from the test vehicle. Is done. By the way, in order to generate a more natural airflow (natural wind) in the wind tunnel, it is necessary to change the wind direction at a predetermined cycle, but there is no conventional wind tunnel device having a wind direction changing function, The vehicle test in an environment closer to actual driving was not possible. Therefore, it is possible to change the wind direction in the wind tunnel by providing a wind direction changing plate in the flow path of the blowing nozzle or directly downstream of the blowing nozzle and rotating the wind direction changing plate at a predetermined cycle. The airflow fluctuation plate causes turbulence in the airflow, and the S / N ratio of the test data decreases due to the driving sound (noise) of the airflow direction fluctuation plate, making it impossible to obtain useful test data. Furthermore, when the blowing nozzle is driven to change the wind direction, the generation of turbulence can be suppressed, while the problem of noise (S / N ratio of test data) cannot be solved. Equipment becomes large and equipment costs increase.
JP-A-5-10847 JP 2005-221237 A

  Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a blow-out nozzle capable of forming natural wind in a wind tunnel without generating noise.

  In order to achieve the above object, the invention according to claim 1 of the present invention is a blow-off nozzle in which an air flow introduced from the introduction port is blown out from the blow-out port, and the introduction port is formed at the upstream end portion. And an outer wall in which a downstream portion is formed between a cylindrical body in which a blowout port is formed at the downstream end and a flow path is formed in the inner space, and an outer wall surface of the cylindrical body. And a communication hole provided in the vicinity of the blowout port of the cylindrical body and communicating with the flow path and the space portion, and pressure fluctuation control means for controlling pressure fluctuation in the space portion.

  According to a second aspect of the present invention, in the blowout nozzle according to the first aspect, the pressure fluctuation control means is a damper that closes / opens an opening formed in the space.

  According to a third aspect of the present invention, in the blowout nozzle according to the first aspect, the pressure fluctuation control means is provided in an opening formed in the space portion, and the space portion is a fan that blows / sucks air. Features.

  According to a fourth aspect of the present invention, in the blowout nozzle according to the first aspect, the pressure fluctuation control means is a piston mechanism in which air in the space is compressed / expanded.

  According to a fifth aspect of the present invention, in the blowout nozzle according to any one of the first to fourth aspects, a silencer is provided in the space portion.

Therefore, in the first aspect of the invention, the pressure gradient of the airflow flowing down in the vicinity of the outlet can be controlled by controlling the pressure fluctuation in the space by the pressure fluctuation control means.
In the invention according to claim 2, the pressure gradient of the airflow flowing down in the vicinity of the outlet is controlled by closing / opening the opening of the space by the damper.
In the invention according to claim 3, the pressure gradient of the airflow flowing down near the outlet is controlled by blowing / suctioning the space by the fan.
In the invention according to claim 4, the pressure gradient of the airflow flowing down in the vicinity of the outlet is controlled by compressing / expanding the air in the space by the piston mechanism.
In the fifth aspect of the invention, the operation sound of the pressure fluctuation control means can be silenced by the silencer means.

  It is possible to provide a blowout nozzle capable of forming natural wind in a wind tunnel without generating noise.

  An embodiment of the present invention will be described with reference to FIGS. The blowout nozzle 1 is used in a vehicle wind tunnel test apparatus, and has a structure that generates a predetermined flow of air in the wind tunnel by blowing the wind transported by the air duct into the wind tunnel. As shown in FIGS. 1 and 2, the blowout nozzle 1 has a rectangular cross section, an introduction port 2 is formed at an upstream end (left side in FIG. 2), and a downstream side (in FIG. 2). A cylindrical body 4 in which a blowout port 3 is formed at the end on the right side) is provided. The cylindrical body 4 is provided with inner walls 5 and 6 formed symmetrically with respect to the center line C on both sides of the nozzle width direction (vertical direction in FIG. 2). Arranged in parallel from the introduction port 2 to the intermediate portion, the interval is narrowed from the intermediate portion to the outlet 3. In addition, the blow nozzle 1 is provided with outer walls 7 and 8 that are opposed to the inner walls 5 and 6 and are symmetrical with respect to the center line C, outside the inner walls 5 and 6. The

  As shown in FIG. 2, each outer wall 7, 8 has an end on the downstream side (right side in FIG. 2) airtightly joined to the edge of the outlet 3 of the cylinder 4, and the upstream side Each of the end portions (left side in FIG. 2) is installed at a predetermined interval with respect to the inner walls 5 and 6. Further, the blowout nozzle 1 is constructed such that a top plate and a bottom plate are installed between the inner walls 5 and 6 and the outer walls 7 and 8, so that the inner walls 5 and 6 and the outer walls 7 and 8 are In the meantime, space portions 9 and 10 having an opening on the upstream side and a width narrowing from the intermediate portion to the downstream are formed. Further, the blowout nozzle 1 is formed in a rectangular shape with a long vertical direction at a predetermined position (in the vicinity of the blowout port 3) of each of the inner walls 5 and 6, and the flow path 11 (inner space of the cylinder 4) and each space portion. Each communication hole 12 and 13 which connects 9 and 10 is provided. Further, the blowout nozzle 1 includes dampers 14 and 15 (pressure fluctuation control means) in which the openings 9a and 10a of the spaces 9 and 10 are closed / opened, and the dampers 14 and 15 are control devices. Each opening 9a, 10a of each space 9, 10 is individually closed / opened by being rotated about each rotation shaft 14a, 15a by driving each damper drive motor that operates based on the control of It has a structure.

  Further, as shown in FIG. 2, in the blowout nozzle 1, a silencer 16 (a silencer) disposed in the vicinity of each opening 9 a, 10 a is disposed in each space 9, 10, and each silencer The member 16 is configured to mute the noise when the dampers 14 and 15 are driven.

  Next, the operation of the main blowing nozzle 1 will be described. First, the wind generated by the blower of the vehicle wind tunnel test apparatus is transported by a duct and introduced into the flow path 11 in the cylindrical body 4 from the inlet 2 of the blowout nozzle 1. And the wind introduce | transduced into the blowing nozzle 1 blows off from the blower outlet 3, and forms an airflow in a wind tunnel. Here, as shown in FIG. 2, since the space between the inner walls 5 and 6 is narrowed from the intermediate portion to the outlet 3, the airflow in the vicinity of the outlet 3 that flows down the flow path 11. The pressure P1 becomes higher than the atmospheric pressure P0. Then, as shown in FIG. 3, the openings 9a and 10a of the spaces 9 and 10 are closed by the dampers 14 and 15 (pressure fluctuation control means) in the nozzle width direction (vertical direction in FIG. 3). If the flow holes 11 and 13 communicate with each other through the communication holes 12 and 13, the air flow pressure P1 in the vicinity of the outlet 3 flowing down the flow path 11 and the space portions 9 and 10 are communicated. 10 and the pressure Pa, Pb are in equilibrium with each other (P1 = Pa = Pb), and the wind blown from the blowout port 3 goes straight along the center line C of the blowout nozzle 1.

  On the other hand, when the damper 14 on the left side (upper side in FIG. 3) is driven and the opening 9a of the space 9 is opened as shown in FIG. 4, the space 9 and the atmosphere communicate with each other. The internal pressure Pa is balanced to the atmospheric pressure P0 (Pa = P0). As a result, the pressure Pa in the space 9 becomes a negative pressure (P1> Pa) with respect to the pressure P1 of the airflow in the vicinity of the outlet 3 flowing down the flow path 11, and in the vicinity of the outlet 3 of the flow path 11, The pressure gradient is such that the pressure decreases toward the left side (upper side in FIG. 4). Therefore, the airflow in the vicinity of the blowout port 3 flowing down the flow path 11 is attracted to the left side, and the wind in the direction inclined to the left side with respect to the nozzle center line C is blown out from the blowout port 3. Note that noise generated when the damper 14 is driven is silenced by the silencer 16 disposed in the space 9.

  On the other hand, the damper 15 on the right side (the lower side in FIG. 3) is driven from the state in which the openings 9a and 10a of the spaces 9 and 10 are closed by the dampers 14 and 15 shown in FIG. As shown in FIG. 5, when the opening 10a of the space 10 is opened, the space 10 and the atmosphere are communicated, and the pressure Pb in the space 10 is balanced to the atmospheric pressure P0 (Pb = P0). As a result, the pressure Pb in the space 10 becomes a negative pressure (P1> Pb) with respect to the pressure P1 of the airflow in the vicinity of the outlet 3 that flows down the flow path 11, and in the vicinity of the outlet 3 of the flow path 11, The pressure gradient is such that the pressure decreases toward the right side (lower side in FIG. 4). Therefore, the airflow in the vicinity of the blowout port 3 flowing down the flow path 11 is attracted to the right side, and the wind in the direction inclined to the right side with respect to the nozzle center line C is blown out from the blowout port 3. Note that noise generated when the damper 15 is driven is silenced by the silencer member 16 disposed in the space 10.

  As described above, in the main blow nozzle 1, the dampers 14 and 15 are driven to alternately close / open the openings 9a and 10a of the spaces 9 and 10, and the internal pressure Pa of the spaces 9 and 10 is obtained. , Pb is changed in pressure from the atmospheric pressure P0 to the pressure P1 of the airflow in the vicinity of the outlet 3 that flows down the flow path 11, and the pressure gradient in the vicinity of the outlet 3 of the flow path 11 is controlled. The direction of the wind blown from the blow-out port 3 can be swung in the left-right direction (vertical direction in FIG. 2) with respect to the nozzle center line C. And in this blowing nozzle 1, internal pressure Pa, Pb of each space part 9 and 10 is a pressure with a predetermined period between the atmospheric pressure P0 and the pressure P1 of the airflow of the vicinity of the blowing outlet 3 which flows down the flow path 11. By changing the direction of the wind blown from the blowout port 3 in the left-right direction (vertical direction in FIG. 2) with respect to the nozzle center line C at a predetermined cycle, an air flow that approximates natural wind is formed in the wind tunnel. Is done.

This embodiment has the following effects.
The blowout nozzle 1 is provided with outer walls 7 and 8 outside the inner walls 5 and 6 of the cylindrical body 4, and the downstream side is closed between the inner walls 5 and 6 and the outer walls 7 and 8. Each space portion 9, 10 is formed, and each inner wall 5, 6 is provided with each communication hole 12, 13 for communicating the flow path 11 and each space portion 9, 10. Since the dampers 9 and 10a are provided with the dampers 14 and 15 (pressure fluctuation control means) for closing / opening the openings 9a and 10a, the dampers 14 and 15 are driven to drive the dampers 9 and 10 respectively. The openings 9a and 10a are alternately closed / opened, and the internal pressures Pa and Pb of the spaces 9 and 10 are changed from the atmospheric pressure P0 to the pressure P1 of the airflow in the vicinity of the outlet 3 flowing down the flow path 11. By controlling the pressure gradient in the vicinity of the outlet 3 of the flow path 11 by changing the pressure, the direction of the wind blown from the outlet 3 is changed to the nozzle center line C. It is possible to swing to the left and right direction for.

  And this blower nozzle 1 is the pressure of internal pressure Pa and Pb of each space part 9 and 10 with a predetermined period between the atmospheric pressure P0 and the pressure P1 of the airflow near the blower outlet 3 which flows down the flow path 11. By changing the direction of the wind blown from the blowout port 3 in the left-right direction with respect to the nozzle center line C at a predetermined cycle, an airflow that approximates natural wind is formed in the wind tunnel. As a result, it becomes possible to reproduce the environment (airflow) extremely in the actual driving of the vehicle in the wind tunnel, and each test data in accordance with the actual driving can be obtained, improving the vehicle performance and silence, and extending Can contribute to improving the quality of vehicles.

  Further, since the blowout nozzle 1 absorbs the drive sound (noise) of the dampers 14 and 15 by the silencer members 16 (silencer means) provided in the space portions 9 and 10, the S / N of the test data It is possible to increase the ratio, and in particular, it is possible to contribute to the improvement of silence by increasing the accuracy of the silence test data.

In addition, embodiment is not limited above, For example, you may comprise as follows.
In the present blowout nozzle 1, the communication holes 12 and 13 are formed in a rectangular shape, but may be, for example, a circle, an ellipse, a slit, or the like as long as noise (wind noise) is not generated.
Further, in the blowout nozzle 1, the width of the space portions 9 and 10 is narrowed from the upstream toward the downstream, but as shown by the broken line in FIG. They may be formed with the same width from the upstream toward the downstream, or may be formed so that the width increases from the upstream toward the downstream.
Further, in the present blowout nozzle 1, the space portions 9 and 10 are provided on both sides in the nozzle width direction of the cylinder 4, but the space portions 9 and 10 may be provided in the nozzle height direction of the cylinder 4. In this case, the dampers 14 and 15 are driven to alternately close / open the openings 9a and 10a of the spaces 9 and 10, and the internal pressures Pa and Pb of the spaces 9 and 10 are changed from the atmospheric pressure P0. By controlling the pressure gradient in the vicinity of the air outlet 3 of the flow path 11 by changing the pressure up to the pressure P1 of the air current in the vicinity of the air outlet 3 flowing down the flow path 11, the air blown out from the air outlet 3 Can be swung up and down with respect to the nozzle center line C.

  Further, as shown in FIG. 6, the pressure fluctuation control means may be configured with fans 17 and 18 instead of the dampers 14 and 15. In this case, the internal pressure Pa of each space part 9, 10 is obtained by blowing the outside air into each space part 9, 10 by each fan 17, 18 or sucking the air inside each space part 9, 10. By varying the pressure of Pb from the atmospheric pressure P0 to the pressure P1 of the airflow in the vicinity of the air outlet 3 flowing down the flow path 11, the pressure gradient in the vicinity of the air outlet 3 of the flow path 11 is controlled. The direction of the wind blown out from the nozzle 3 can be swung in the left-right direction with respect to the nozzle center line C. In addition, the internal pressures Pa and Pb of the spaces 9 and 10 are varied in a predetermined cycle from the atmospheric pressure P0 to the pressure P1 of the airflow in the vicinity of the air outlet 3 flowing down the flow path 11, and the air outlet 3 By swinging the direction of the wind blown out from the nozzle center line C in the left-right direction at a predetermined cycle, an air flow that approximates natural wind is formed in the wind tunnel. Further, the operation noise (noise) of the fans 17 and 18 is absorbed by the noise reduction members 16 (noise reduction means) provided in the spaces 9 and 10.

  Further, as shown in FIG. 7, the pressure fluctuation control means may be constituted by the piston mechanisms 19 and 20 instead of the dampers 14 and 15. In this case, the internal pressures Pa and Pb of the spaces 9 and 10 are changed by the piston mechanisms 19 and 20 from the atmospheric pressure P0 to the pressure P1 of the airflow in the vicinity of the outlet 3 that flows down the flow path 11. Thus, by controlling the pressure gradient in the vicinity of the outlet 3 of the flow path 11, the direction of the air blown from the outlet 3 can be swung in the left-right direction with respect to the nozzle center line C. In addition, the internal pressures Pa and Pb of the spaces 9 and 10 are varied in a predetermined cycle from the atmospheric pressure P0 to the pressure P1 of the airflow in the vicinity of the air outlet 3 flowing down the flow path 11, and the air outlet 3 By swinging the direction of the wind blown out from the nozzle center line C in the left-right direction at a predetermined cycle, an air flow that approximates natural wind is formed in the wind tunnel. Furthermore, the drive sound (noise) of each piston mechanism is absorbed by each silencer member 16 (silencer means) provided in each space portion 9, 10.

It is a perspective view which shows the downstream part of this blowing nozzle. It is a top view which shows typically the structure of this blowing nozzle. It is explanatory drawing of this blowing nozzle, Comprising: It is a figure which shows the state by which each opening part of each space part was obstruct | occluded by each damper. It is explanatory drawing of this blower nozzle, Comprising: The figure which shows the state which the wind blown from the blower outlet was shaken from the straight advance to the left side by opening the opening part of the left side space part from the state shown in FIG. It is. FIG. 5 is an explanatory diagram of the blow-out nozzle, and from the state shown in FIG. 4, the air blown from the blow-out port is blown to the left side when the left-side space opening is closed and the right-side opening is opened. It is a figure which shows the state swung to the right side. It is a figure which shows the state which comprised the pressure fluctuation control means with each fan instead of each damper in FIG. It is a figure which shows the state which comprised the pressure fluctuation control means with each piston mechanism instead of each damper in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Outlet nozzle, 2 Introducing port, 3 Outlet port, 4 Cylinder, 5,6 Inner wall, 7,8 Outer wall, 9,10 Space part, 9a, 10a Opening part, 11 Flow path, 12,13 Communication hole, 14, 15 Damper (pressure fluctuation control means), 16 Silencer member (silencer means)

Claims (5)

  A blow-off nozzle in which an air flow introduced from an introduction port is blown out from a blow-out port, wherein the introduction port is formed at an upstream end and the blow-off port is formed at a downstream end, and a flow path is formed in an internal space. Formed in the vicinity of the outlet of the cylinder, and the flow path and the cylinder. A blowout nozzle comprising: a communication hole that communicates with a space portion; and a pressure fluctuation control unit that controls pressure fluctuation in the space portion.   The blowout nozzle according to claim 1, wherein the pressure fluctuation control means is a damper in which an opening formed in the space is closed / opened.   The blowing nozzle according to claim 1, wherein the pressure fluctuation control means is a fan that is provided in an opening formed in the space portion and blows / sucks the space portion.   The blowing nozzle according to claim 1, wherein the pressure fluctuation control means is a piston mechanism in which air in the space is compressed / expanded.   The blowing nozzle according to any one of claims 1 to 4, wherein a silencer is provided in the space.

Images