JP2017111057A - Run-of-river type boundary layer controller and wind tunnel test device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a run-of-river type boundary layer controller capable of performing various tests precisely and a wind tunnel test device using the same.SOLUTION: A self-stream type boundary layer controller includes: a moving ground surface plate that is connected with a draft air duct and installed in a measurement chamber to which air is supplied from the draft air duct, and in which a measuring object is arranged; a run-of-river suction port that is arranged at a downstream side of the draft air duct and at an upstream side of the moving ground surface plate in a direction of travel of air and opened on a floor surface near an air suction port for suctioning air; a flow pass that is connected with the run-of-river suction port and through which air flowed from the run-of-river suction port flows; a flow path that is connected with the run-of-river suction port and through which air flowed therefrom flows; and a run-of-river outlet that is connected with the other end section of the flow pass and discharges air between the air suction port and the moving ground surface plate. The flow pass includes a guide section that is directed toward a. downstream side in a direction of travel of a main flow that is supplied from the draft air duct into the measurement chamber as the main flow is directed to a connection section with the run-of-river Outlet in the connection section therewith.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a self-flow type boundary layer control device and a wind tunnel test device using the same.

  Wind tunnel testing devices that test the characteristics against airflow are used. In the wind tunnel test apparatus, a blower is provided on one end side of the apparatus, and the blower is driven to form an air flow in the wind tunnel, and various characteristics are measured in a measurement region. Some wind tunnel testing devices are equipped with an air inlet that controls the characteristics of the boundary layer of the floor interface of the wind tunnel, where there is a difference between the test conditions and the actual driving condition, in order to test the characteristics of the vehicle in the driving condition. is there.

  Patent document 1 discloses a boundary layer in which jet air is circulated and circulated by a blower through an annular continuous air passage and the main air of the jet air is generated on the floor interface side when the jet air is blown out to a measurement region through an air outlet. A wind tunnel boundary layer control device having a suction duct that sucks and discharges in a vertical axis direction with respect to a main flow direction of jet air is described. The wind tunnel boundary layer control device described in Patent Literature 1 reduces the stagnation pressure of jet air sucked into the suction duct, and reduces the inhibition of the flow of the jet air in the main flow direction.

JP 2009-156695 A

  Here, the wind tunnel test apparatus can control the flow of gas in the boundary layer, which is the floor boundary surface of the wind tunnel, by using the boundary layer control apparatus as in Patent Document 1, thereby improving the reproducibility of the wind tunnel test. can do.

  Here, in the wind tunnel test apparatus, there is an apparatus in which a moving ground plate on which a road surface moves is installed on a road surface on which a vehicle is grounded in order to reproduce a state in which a measurement object is traveling. In the wind tunnel testing apparatus having the moving ground plate, a certain distance is generated between the boundary layer control device and the moving ground plate. For this reason, even when the flow is controlled by the boundary layer control device, the boundary layer develops until the moving ground plane is reached, and the reproducibility of the airflow in the traveling state is lowered.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the self-flow type boundary layer control apparatus which can perform various tests with high precision, and a wind tunnel test apparatus using the same.

  The present invention for solving the above-described problems includes a moving ground plate that is connected to an air passage and is provided in a measurement chamber to which air is supplied from the air passage, and in which a measurement object is disposed, and in the traveling direction of the air A self-flow suction port that is disposed downstream of the air flow path and upstream of the moving ground plate and opens to the floor between the air suction port for sucking the air, and connected to the self-flow suction port A flow path through which air flowing in from the self-flow suction port flows, and a self-flow outlet that is connected to the other end of the flow path and discharges air between the air suction port and the moving ground plate. The flow path is directed to the downstream side in the traveling direction of the main flow supplied from the air passage to the measurement chamber as it goes to the connection portion with the self-flow outlet at the connection portion with the self-flow outlet. It has a guide part.

  The self-flow outlet preferably has an opening area smaller than that of the self-flow inlet.

  The self-flow outlet is a slit extending in a direction orthogonal to the air traveling direction, and the self-flow inlet is a slit extending in a direction orthogonal to the air traveling direction or the air flow A perforated plate in which a plurality of holes are formed in a direction orthogonal to the direction is preferable.

  Moreover, it is preferable that the angle | corner which the advancing direction of the air blown out from the said self-flow blower outlet and the advancing direction of the said main flow make is 15 degrees or less.

  Moreover, it is preferable that the said self-flow outlet opens to the floor surface of the said measurement chamber.

  Moreover, it is preferable that the said self-flow inlet is opened to the floor surface by the side of the said air inlet rather than the said self-flow outlet.

  Moreover, it is preferable that the said self-flow inlet is opened to the floor surface by the side of the said movement ground board rather than the said self-flow outlet.

  Further, the moving ground plate has an endless belt and a roller for rotating the endless belt, and the self-flow outlet is arranged on a lower side in the vertical direction than the floor surface of the roller of the moving ground plate. At a position facing the portion, opened in a space communicating with the measurement chamber, a traveling direction of the air blown from the self-flow outlet, a line extending the traveling direction of the air blown from the self-flow outlet, and the The angle formed by the tangent of the rotor at the contact point with the roller is preferably 15 ° or less.

  Moreover, it is preferable that a cross-sectional area becomes small as the said guide part goes to the downstream of the said gas flow direction.

  Moreover, it is preferable to have an adjustment mechanism that can move the floor surface between the self-flow outlet and the self-flow inlet in the air traveling direction.

  The present invention for solving the above-described problem is a wind tunnel test apparatus, which is provided with an air passage, a measurement chamber connected to the air passage, and supplied with air from the air passage, and provided in the measurement chamber for measurement. A moving ground plate on which an object is disposed, an air suction port that is disposed downstream of the air blowing path and upstream of the moving ground plate in the air traveling direction, and sucks the air; and the movement The self-flow type boundary layer control device according to any one of the above, which is disposed between a ground plate and the air suction port.

  ADVANTAGE OF THE INVENTION According to this invention, air can be drawn in appropriately with a self-flow inlet, air can be blown out appropriately with a self-flow outlet, and development of a boundary layer can be suppressed. Thereby, a uniform flow of air can be supplied to the measurement region, and various tests can be executed with high accuracy. Moreover, air can be flowed using the mainstream flow, and no power is required. Thereby, various tests can be performed efficiently.

FIG. 1 is a schematic diagram showing a schematic configuration of the wind tunnel testing apparatus of the first embodiment. FIG. 2 is a schematic diagram showing a schematic configuration of the air suction port, the self-flowing boundary layer control device, and the moving ground plate. FIG. 3 is an enlarged cross-sectional view of the self-flowing boundary layer control apparatus according to the first embodiment. FIG. 4 is an enlarged cross-sectional view showing the self-flowing boundary layer control apparatus of the second embodiment. FIG. 5 is an enlarged cross-sectional view showing the self-flowing boundary layer control device of the third embodiment. FIG. 6 is an enlarged cross-sectional view of the self-flowing boundary layer control device of the fourth embodiment. FIG. 7 is an enlarged cross-sectional view of the self-flowing boundary layer control apparatus of the fifth embodiment. FIG. 8 is an enlarged cross-sectional view of the self-flowing boundary layer control device of the sixth embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the content described in the following embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined without departing from the scope of the present invention.

  A wind tunnel test apparatus 10 having a self-flowing boundary layer control apparatus 18 according to a first embodiment will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating a schematic configuration of a wind tunnel testing apparatus 10 according to the first embodiment.

  The wind tunnel test apparatus 10 includes a wind tunnel 12, a fan (blower) 13, an air suction port 14, a self-flowing boundary layer control device 18 a, and a moving ground plate 60. The wind tunnel 12 is a path through which air flows, and includes a blower path 15 and a measurement chamber 17. A plurality of air passages 15 are pipe lines bent at four places in the present embodiment, and one end portion serves as a suction port (collector) 20 and the other end portion serves as a blowout port 22. As for the ventilation path 15, the suction inlet 20 and the blower outlet 22 have faced.

  Further, the wind tunnel 12 is provided with corner vanes 26a, 26b, 26c, and 26d at four bent portions of the air passage 15, that is, corner portions. The corner vanes 26a, 26b, 26c, and 26d are mechanisms that guide the direction of the air flowing through the air blowing path 15 from the upstream direction to the downstream direction. In this embodiment, it arrange | positions in order of the corner vanes 26c, 26d, 26a, and 26b toward the blower outlet 22 from the suction inlet 20. FIG. The air passage 15 reduces the resistance in the air passage 15 by guiding air with the corner vanes 26c, 26d, 26a, and 26b.

  The measurement chamber 17 is a room in which both ends of the air passage 15 are inserted. In the measurement chamber 17, the inlet 20 and the outlet 22 are exposed inside. The measurement chamber 17 is provided with a measurement region 27 in which the test body, in the present embodiment, the vehicle 8 is disposed between the suction port 20 and the blowout port 22. Thus, the wind tunnel 12 has both ends of the air passage 15 connected to the measurement chamber 17, and the air passage 15 and the measurement chamber 17 form a path through which air circulates.

  The fan (blower) 13 is disposed inside the air passage 15. Specifically, it is disposed between the corner vane 26d and the corner vane 26a. The fan 13 sends air from the corner vane 26d toward the corner vane 26a, and in this order, the corner vane 26a, the corner vane 26b, the air outlet 22, the measurement chamber 17, the suction port 20, the corner vane 26c, and the corner vane 26d. Jet air 30 that is a flow of air circulating through the air passage 15 and the measurement chamber 17 is formed.

  In addition, the wind tunnel test apparatus 10 is provided between the air outlet 22 and the corner vane 26b, that is, on the downstream side of the fan 13 in the flow direction of the jet air 30 and on the upstream side of the air outlet 22 ( A heat exchanger) 28 and a rectifying unit 29. The rectifying unit 29 is disposed on the downstream side of the air cooling device 28. The air cooling device 28 adjusts the temperature of the jet air 30 supplied to the measurement chamber 17. The rectifying unit 29 includes, for example, a rectifying wire mesh and a rectifying grid, and rectifies the flowing jet air 30. By rectifying by the rectifying unit 29, the jet air 30 blown out from the outlet 22 and supplied to the measurement chamber 17 can be rectified.

  The wind tunnel test apparatus 10 drives a fan (blower) 13 to form an air flow in the wind tunnel 12. Specifically, the air in the measurement chamber 17 is collected from the suction port 20 by forming the flow of the jet air 30 flowing in one direction in the air passage 15 by the fan 13, and the air is passed through the air passage 15. After rectification by the rectification unit 29, the jet air 30 can be blown out from the blowout port 22 to the measurement chamber 17. Thereby, the jet air 30 can be blown onto the vehicle 8 in the measurement region 27. The wind tunnel test apparatus 10 can adjust the wind speed of the jet air 30 blown to the measurement region 27 by the fan 13.

  The wind tunnel test apparatus 10 arranges the vehicle 8 in the measurement region 27 of the measurement chamber 17, further arranges the measurement device, and measures various measurement parameters in a state where the jet air 30 is blown onto the vehicle 8, thereby calculating the wind speed distribution. Various tests such as noise can be performed.

  In the wind tunnel testing apparatus 10, the wind speed may be controlled by limiting the fan suction flow rate by the inlet guide vane, limiting the fan discharge flow rate by the damper, and controlling the flow rate by the variable pitch of the fan 13.

  Next, in addition to FIG. 1, the air inlet 14 will be described with reference to FIG. FIG. 2 is a schematic diagram showing a schematic configuration of the air suction port, the self-flowing boundary layer control device, and the moving ground plate. FIG. 2 schematically shows the top and side surfaces of each part.

  The air suction port 14 is provided between the air outlet 22 and a self-flowing boundary layer control device 18 described later in the flow direction 42 of the jet air 30 in the measurement chamber 17, that is, in the direction from the air outlet 22 toward the air inlet 20. It is connected to the floor surface 40 of the measurement chamber 17. The air suction port 14 is formed with a floor surface suction port 38 at a position where it is connected to the floor surface 40, and can suck air in the measurement chamber 17. The air suction port 14 includes a suction duct 32, a blower (suction machine) 34, and a suction plate 36.

  The suction duct 32 is connected to a floor surface suction port 38 that is an opening formed in the floor surface 40. In the suction duct 32, a portion including a connection portion with the floor surface suction port 38 extends in a direction orthogonal to the flow direction 42. That is, the suction duct 32 is connected to the floor surface 40 at a right angle. The blower 34 sucks the air in the suction duct 32 and forms a flow in the flow direction 44, that is, a flow of air from the floor surface suction port 38 to the other end of the suction duct 32.

  Here, in the wind tunnel test apparatus 10, resistance is generated between the main flow layer 50 and the floor surface 40 of the measurement chamber 17 in addition to the main flow layer 50 formed by the main flow air (steady flow rate) of the jet air 30 ejected from the air outlet 22. Therefore, a boundary layer 52 with a delayed wind speed is generated along the floor surface 40. Therefore, when the test of the wind speed distribution of the vehicle 8 is performed, the boundary layer 52 is affected. The boundary layer 52 refers to a layer in the range where the velocity of the mainstream air near the floor surface changes rapidly from the floor surface surface to the mainstream air flow velocity. For example, the mainstream air flow velocity is 100%. Is a layer where the flow velocity is reduced to 99% or less.

  In contrast, the air suction port 14 drives the blower 34 and sucks air from the measurement chamber 17 through the suction duct 32 from the floor surface suction port 38, so that the air suction port 14 is ejected from the air outlet 22 and flows in the flow direction 42. The influence of the boundary layer 52 can be reduced by sucking a part of the boundary layer 52 portion of the jet air 30 flowing into the flow direction 44 perpendicular to the flow direction 42.

  Next, in addition to FIG. 1, the moving ground board 60 is demonstrated using FIG. The moving ground plate 60 is disposed on the floor surface of the measurement region 27 on the downstream side of the air suction port 14 in the mainstream flow direction, and the vehicle 8 to be measured is grounded. The moving ground plate 60 has two rollers 62 and a moving belt (endless belt) 64. The two rollers 62 are disposed at a predetermined distance in the mainstream air flow direction. The moving belt 64 is stretched by two rollers 62. The moving ground plate 60 moves the moving belt 64 by rotating the roller 62. Specifically, by rotating the roller 62, the surface on the floor surface side of the moving belt 64 is moved in the same direction as the mainstream flow direction (traveling direction). The moving ground plate 60 can move the floor on which the vehicle 8 is grounded in the mainstream flow direction by rotating the roller 62 and rotating the moving belt 64. Thereby, the floor can be moved at a speed according to the mainstream flow during the test. The moving ground plate 60 can move the road surface on which the vehicle 8 is grounded by moving the ground on which the vehicle 8 is grounded according to the test conditions, and reproduces a state close to the actual traveling state. be able to. Further, the moving ground plate 60 can reduce the influence of the boundary layer 52 by controlling the moving speed of the upper surface of the moving belt 64 according to the speed of the mainstream layer 50.

  Next, in addition to FIG.1 and FIG.2, the self-flow type boundary layer control apparatus 18a is demonstrated using FIG. FIG. 3 is an enlarged cross-sectional view of the self-flowing boundary layer control apparatus according to the first embodiment. The self-flowing boundary layer control device 18 a is disposed between the air inlet 14 and the moving ground plate 60. That is, the self-flow type boundary layer control device 18a is located on the downstream side of the air suction port 14 on the upstream side of the moving ground plate 60 in the mainstream flow direction, in other words, on the outlet 22 side of the moving ground plate 60. Yes, it is arranged at a position closer to the suction port 20 than the air suction port 14. The self-flowing boundary layer control device 18a includes a self-flow outlet 70a, a self-flow inlet 72a, a top plate 76a, and a flow path 78a. The channel 78a has a guide portion 79a. The self-flow type boundary layer control device 18a is arranged in the order of the self-flow outlet 70a and the self-flow inlet 72a along the main flow direction.

  The self-flow outlet 70 a is an opening formed on the floor surface of the measurement chamber 17 and at a position between the air inlet 14 and the moving ground plate 60. The self-flow outlet 70 a is connected to the measurement chamber 17. The self-flow outlet 70a is formed in a range wider than the range in which the movable ground plate 60 is disposed, in the direction orthogonal to the mainstream flow direction, including the entire area where the movable ground plate 60 is disposed. ing. The self-flow outlet 70a becomes one slit.

  The self-flow inlet 72a is an opening formed in the floor surface of the measurement chamber 17 on the suction port 20 side than the self-flow outlet 70a. The self-flow suction port 72 a is connected to the measurement chamber 17. The self-flow suction port 72a is formed in a range wider than the range in which the moving ground plate 60 is disposed, in the direction orthogonal to the flow direction of the main flow, including the entire range of the range in which the moving ground plate 60 is disposed. ing. The self-flow suction port 72a becomes one slit.

  The top plate 76a is a part of the floor surface of the measurement chamber 17, and is a portion between the self-flow outlet 70a and the self-flow inlet 72a. The top plate 76a has a floor surface between the self-flow outlet 70a and the self-flow suction port 72a at the same height as the front and rear portions in the mainstream flow direction.

  The flow path 78a connects the self-flow outlet 70a and the self-flow inlet 72a. The flow path 78a of this embodiment is a pipe line in which a space is formed on the side of the top plate 76a opposite to the measurement chamber 17 side. The guide part 79a is a pipe line connected to the self-flow outlet 70a. The guide portion 79a is formed in a direction toward the downstream side in the mainstream traveling direction as it goes to the connection portion with the self-flow outlet 70a. The guide part 79a of this embodiment is a pipe line having a constant cross-sectional area.

  The self-flow type boundary layer control device 18a has the above-described structure. When the jet air 30 is discharged from the outlet 22 and the jet air is supplied to the measurement chamber 17, a part of the jet air on the floor surface side, That is, a part of the flow of the boundary layer 52 flows into the self-flow inlet 72 a as shown in the flow direction 74, flows through the flow path 78 a and the guide portion 79 a, and is blown out from the self-flow outlet 70 a into the measurement chamber 17. In the self-flow type boundary layer control device 18a, an air flow is formed in the direction along the main flow direction by the guide portion 79a, and the air along the main flow direction is discharged from the self-flow outlet 70a.

  The self-flow type boundary layer control device 18a discharges air flowing along the mainstream traveling direction to the vicinity of the floor surface, thereby forming a boundary layer formed on the floor surface between the air suction port 14 and the moving ground plate 60. 52 can be reduced. Specifically, the width of the floor surface 40 located on the air outlet 22 side of the moving ground plate 60 and closer to the air inlet 20 side of the air suction port 14 is set so that the moving ground plate 60 is a roller. 62, it has a certain length. The wind tunnel test apparatus 10 of the present embodiment is provided with a self-flowing boundary layer control device 18a between the air suction port 14 and the moving ground plate 60, so that the floor between the air suction port 14 and the moving ground plate 60 is provided. The generated boundary layer can be eliminated by sucking the air flowing through the surface 40. Further, the self-flow type boundary layer control device 18a connects the self-flow outlet 70a and the self-flow suction port 72a through the flow path 78, and forms a flow in which the main flow flows in and the inflow air is discharged, thereby forming the self-flow suction port 72a. The air can be sucked into the air, or the sucked air can be discharged from the self-flow outlet 70a without using power. Thereby, the apparatus configuration can be simplified, and energy can be effectively utilized. Further, it can be installed between the air suction port 14 and the moving ground plate 60, which is a limited space, and a boundary layer is generated between the air suction port 14 and the moving ground plate 60. Can be reduced.

  Here, in the self-flow type boundary layer control device 18a, it is preferable that the opening area of the self-flow outlet 70a is smaller than the opening area of the self-flow inlet 72a. Thereby, it is possible to increase the flow velocity of the air blown from the self-flow outlet 70a, and the generation of the boundary layer 52 can be further suppressed.

  In addition, the angle θ formed by the traveling direction 82 of air blown from the self-flow outlet 70a (the central axis of the guide portion 79a) and the flow direction 80 of the main flow flowing above the self-flow outlet 70a is 15 ° or less. preferable. As a result, the angle difference between the flow direction of the air blown from the self-flow outlet 70a and the flow direction of the main flow is reduced, the flow velocity of the boundary layer 52 is effectively increased, and the development of the boundary layer 52 can be suppressed.

  Although the self-flow suction port 72a is a slit in the present embodiment, it may be a perforated plate in which a large number of holes are formed in a direction orthogonal to the main flow direction. The self-flow suction port 72a is preferably a slit or a perforated plate, so that air can be sucked in appropriately. Moreover, the self-flow outlet 70a can be suitably blown off by using a slit. Specifically, by making the self-flow inlet 72a and the self-flow outlet 70a have the above-described structure, it is possible to suppress the distribution of the passing air and to make the air flow uniform in the cross section orthogonal to the air flow. it can.

  Moreover, it is preferable that the self-flow type boundary layer control device 18a is provided with an adjustment mechanism capable of moving the self-flow outlet 70a and the top plate 76a sandwiched between the self-flow suction ports 72a in the air traveling direction. By moving the top plate 76a, the ratio of the opening area of the self-flow outlet 70c and the opening area of the self-flow inlet 72c can be changed, and the ratio of the opening area where suction and blowing can be suitably performed. Can be tested.

Next, the self-flow type boundary layer control device 18b of the wind tunnel testing device of the second embodiment will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view showing the self-flowing boundary layer control device of the second embodiment.
Note that the self-flowing boundary layer control device 18b of the second embodiment can be applied to the wind tunnel test device 10 instead of the self-flowing boundary layer control device 18a of the first embodiment described above. That is, the wind tunnel test apparatus of the second embodiment has the same configuration as the wind tunnel test apparatus 10 except for the self-flowing boundary layer control apparatus 18b. This also applies to the embodiments described later.

  The self-flowing boundary layer control device 18b shown in FIG. 4 has a self-flow outlet 70b, a self-flow inlet 72b, a top plate 76b, and a flow path 78b. The channel 78b has a guide part 79b. The self-flowing boundary layer control device 18b has the same structure as the self-flowing boundary layer control device 18a except for the shape of the guide portion 79b. The guide portion 79b has a shape in which the cross-sectional area of the self-flow outlet 70b gradually decreases as it approaches the self-flow outlet 70b, that is, toward the downstream side in the air flow direction. The self-flow type boundary layer control device 18b can compress the air flowing through the guide portion 79b by making the shape of the guide portion 79b gradually reduce the cross-sectional area toward the self-flow outlet 70b. The flow velocity of the air blown out from the outlet 70b can be increased. Thereby, generation | occurrence | production of the boundary layer 52 can be suppressed more. This point is the same in other embodiments described later, and the occurrence of the boundary layer 52 can be further suppressed by adjusting the shape of the guide portion.

  Next, the self-flow type boundary layer control apparatus 18c of 3rd Embodiment is demonstrated using FIG. FIG. 5 is an enlarged cross-sectional view showing the self-flowing boundary layer control device of the third embodiment. The self-flowing boundary layer control device 18c shown in FIG. 5 includes a self-flow outlet 70c, a self-flow inlet 72c, a top plate 76c, and a flow path 78c. The channel 78c has a guide part 79c. In the self-flowing boundary layer control device 18c shown in FIG. 5, the self-flow suction port 72c is opened to the floor surface on the air outlet 22 side from the self-flow air outlet 70c. That is, the self-flow type boundary layer control device 18c is arranged in the order of the self-flow inlet 72c and the self-flow outlet 70c from the upstream side in the main flow direction.

  As described above, the self-flow boundary layer control device 18c allows the air in the boundary layer 52 to flow through the self-flow inlet 72c even if the self-flow outlet 70c is arranged downstream of the self-flow inlet 72c. Suction and air flow can be created that reduces the formation of the boundary layer 52.

  Next, the self-flowing boundary layer control device 18d of the fourth embodiment will be described with reference to FIG. FIG. 6 is an enlarged cross-sectional view of the self-flowing boundary layer control device of the fourth embodiment. The self-flowing boundary layer control device 18d shown in FIG. 6 has a self-flow outlet 70d, a self-flow inlet 72d, a top plate 76d, and a flow path 78d. The channel 78d has a guide portion 79d. In the self-flow type boundary layer control device 18d, the self-flow suction port 72d is opened to the floor surface on the air outlet 22 side from the self-flow air outlet 70d. That is, the self-flowing boundary layer control device 18d is arranged in the order of the self-flow inlet 72d and the self-flow outlet 70d from the upstream side in the mainstream flow direction.

  Further, the self-flow outlet 70 d is opened in the roller vicinity wall surface 66 of the moving ground plate 60. That is, the self-flow outlet 70 d is open in the wall surface of the space between the floor surface 40 and the moving ground plate 60 in a region vertically below the floor surface of the measurement chamber 17. The self-flow type boundary layer control device 18 d blows air from the roller vicinity wall surface 66 toward the roller 62 by blowing air from the self-flow outlet 70 d. Thereby, the self-flow type boundary layer control device 18d causes the air blown from the self-flow outlet 70d to move into the measurement chamber 17 from the gap between the upstream end portion in the main flow direction of the moving ground plate 60 and the floor surface 40. Can be supplied to. Thereby, it is possible to more suitably form an air flow along the flow direction of the main flow on the surface of the moving belt 64 moved into the measurement chamber 17, and the main flow on the surface of the moving belt 64 moved into the measurement chamber 17. An air flow close to the layer 50 can be formed.

  Here, the angle at which air is blown from the self-flow outlet 70d (the angle of the central axis of the guide portion 79d) is the roller 62 at the contact point between the traveling direction of the air blown from the self-flow outlet 70d and the roller 62 of the moving ground plate 60. It is preferable that the angle formed with the tangent line is 15 ° or less. Thereby, air can be blown off at the boundary between the roller 62 and the floor surface 40 in the measurement chamber 17, and the generation of the boundary layer 52 can be further suppressed.

  Next, the self-flowing boundary layer control device 18e of the fifth embodiment will be described with reference to FIG. FIG. 7 is an enlarged cross-sectional view of the self-flowing boundary layer control apparatus of the fifth embodiment. The self-flowing boundary layer control device 18e shown in FIG. 7 has a self-flow outlet 70e, a self-flow inlet 72e, a top plate 76e, and a flow path 78e. The channel 78e has a guide part 79e. The flow path 78e of the self-flowing boundary layer control device 18 has a wind guide portion 84 in a region connected to the upstream end of the self-flow suction port 72e. The wind guide portion 79 is formed with an inclination that changes in position along the lower side in the vertical direction as it travels along the mainstream traveling direction. The self-flow type boundary layer control device 18 can make the intake air easily flow into the self-flow suction port 72e by providing the air guide portion 84. Thereby, inflow of the air of the boundary layer 52 can be smoothly performed by the self-flowing boundary layer control device 18e, and the boundary layer 52 can be further reduced.

  Next, the self-flowing boundary layer control device 18f of the sixth embodiment will be described with reference to FIG. FIG. 8 is an enlarged cross-sectional view of the self-flowing boundary layer control device of the sixth embodiment. The self-flowing boundary layer control device 18f shown in FIG. 8 has a self-flow outlet 70f, a self-flow inlet 72f, a top plate 76f, and a flow path 78f. The channel 78f has a guide portion 79f. The flow path 78f has a structure in which the flow path is connected to the plane and the curved surface in the direction along the air flow direction, and there is no portion where the plane and the plane are connected. That is, the flow path 78f has a structure in which a region where the air flow changes is formed as a curved surface and has no corners. The self-flow type boundary layer control device 18f reduces the fluid resistance of the air flowing through the flow path 78f by making the flow path 78f a shape having no corners in the direction along the air flow direction. As a result, it is possible to suppress the generation of the boundary layer 52 more suitably.

  The self-flowing boundary layer control devices 18a, 18b, 18c, 18d, 18e, and 18f of the present embodiment are not limited to the above-described embodiments, and may have shapes that combine various embodiments. For example, the structure of the guide portions 79c and 79d of the self-flowing boundary layer control devices 18c and 18d may be the structure of the guide portion 79b. The structure of the self-flowing boundary layer control devices 18e and 18f may be applied to other embodiments.

DESCRIPTION OF SYMBOLS 8 Vehicle 10 Wind tunnel test apparatus 12 Wind tunnel 13 Fan 14 Air inlet 15 Air passage 17 Measurement chamber 18a, 18b, 18c, 18d, 18e, 18f Self-flow type boundary layer control apparatus 20 Inlet 22 Air outlet 26a, 26b, 26c, 26d Corner vane 27 Measurement area 28 Air cooling device 29 Rectifier 30 Jet air 32 Suction duct 34 Blower (suction machine)
36 Suction plate 38 Floor surface suction port 40 Floor surface 50 Main flow layer 52 Boundary layer 60 Moving ground plate 62 Roller 64 Moving belt 66 Roller vicinity wall surface 70a, 70b, 70c, 70d, 70e, 70f Self-flow outlet 72a, 72b, 72c, 72d, 72e, 72f Self-flow suction port 74 Flow direction 76a, 76b, 76c, 76e, 76f Top plate 78a, 78b, 78c, 78d, 78e, 78f Channel 79a, 79b, 79c, 79d, 79e, 79f Guide part 84 Guide Kazebe

Claims (11)

A moving ground plate connected to the air passage and provided in a measurement chamber to which air is supplied from the air passage, and the object to be measured is disposed; and on the downstream side of the air passage in the traveling direction of the air and the moving ground A self-flow suction port that is disposed on the upstream side of the face plate and opens to the floor surface between the air suction port that sucks the air, and
A flow path connected to the self-flow inlet and through which air flowing in from the self-flow inlet flows;
A self-flow outlet that is connected to the other end of the flow path and discharges air between the air suction port and the moving ground plate;
The flow path has a guide portion that is directed to the downstream side in the traveling direction of the main flow supplied from the air passage to the measurement chamber as it goes to the connection portion with the self-flow outlet at the connection portion with the self-flow outlet. A self-flowing boundary layer control device comprising:   The self-flow type boundary layer control device according to claim 1, wherein the self-flow outlet has an opening area smaller than an opening area of the self-flow inlet. The self-flow outlet is a slit extending in a direction orthogonal to the traveling direction of the air,
2. The self-flow inlet is a slit extending in a direction orthogonal to the air traveling direction or a perforated plate having a plurality of holes formed in a direction orthogonal to the air flow direction. Or the self-flow type boundary layer control apparatus of 2.   The self-flow type boundary layer according to any one of claims 1 to 3, wherein an angle formed by a traveling direction of air blown from the self-flow outlet and a traveling direction of the main flow is 15 ° or less. Control device.   The self-flow type boundary layer control device according to any one of claims 1 to 4, wherein the self-flow outlet is opened on a floor surface of the measurement chamber.   The self-flow type boundary layer control device according to claim 5, wherein the self-flow suction port is opened to a floor surface on the air suction port side with respect to the self-flow air outlet.   The self-flow type boundary layer control device according to claim 5, wherein the self-flow suction port is opened to a floor surface closer to the moving ground plate than the self-flow outlet. The moving ground plate has an endless belt and a roller for rotating the endless belt,
The self-flow outlet is opened to a space communicating with the measurement chamber at a position facing a portion of the moving ground plate that is disposed on the lower side in the vertical direction than the floor surface of the roller.
The angle formed by the traveling direction of the air blown from the self-flow outlet, and the tangent line of the roller at the contact point between the roller and the line extending the traveling direction of the air blown from the self-flow outlet is 15 ° or less. The self-flowing boundary layer control device according to any one of claims 1 to 3, wherein   The self-flow type boundary layer control device according to any one of claims 1 to 8, wherein the guide portion has a cross-sectional area that decreases toward a downstream side in the air flow direction.   The self-flow type boundary according to any one of claims 1 to 9, further comprising an adjustment mechanism capable of moving a floor surface between the self-flow outlet and the self-flow suction port in a traveling direction of the air. Layer control device. An air duct,
A measurement chamber connected to the air passage and supplied with air from the air passage;
A movable ground plate provided in the measurement chamber and on which a measurement object is disposed;
An air suction port that is disposed downstream of the air flow path and upstream of the moving ground plate in the air traveling direction, and sucks the air;
A wind tunnel testing device comprising: the self-flowing boundary layer control device according to any one of claims 1 to 10 disposed between the moving ground plate and the air suction port.

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