JP2009023572A - Moving vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle provided with an exhaust vent and capable of improving efficiency of exhaust while the vehicle moves and reducing aerodynamic noise occurred in a part around the exhaust vent. <P>SOLUTION: This vehicle is provided with inclined parts 7 having inclination toward the exhaust vent 4 in the direction of inner side of the vehicle of the exhaust vent 4 on surfaces of the vehicle on a front side for the direction of advance of the vehicle and a rear side for the direction of advance of the vehicle of the exhaust vent 4, respectively, and projections 8 constituted by projecting inclined parts 8a, 8b and protruding in the direction of normal line on an outer side of the vehicle on the surface of the vehicle in end parts on the front side for the direction of advance of the vehicle and the rear side for the direction of advance of the vehicle of the exhaust vent 4, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a moving vehicle including an exhaust port that exhausts air inside the vehicle to the outside of the vehicle.

  The moving vehicle is provided with an exhaust port on the outer surface of the vehicle in order to exhaust the air conditioner and the equipment cooling air to the outside of the vehicle. However, since the traveling wind generated when the moving vehicle travels enters the exhaust port, the exhaust from the inside of the vehicle to the outside of the vehicle is hindered by the traveling wind, and the exhaust efficiency decreases. There's a problem.

  As a conventional technique for improving the exhaust efficiency from the exhaust port of a moving vehicle, for example, as disclosed in Patent Document 1, exhaust is provided by providing columnar rectifying protrusions along the front and rear ends of the moving vehicle exhaust port. Some have suggested improvements in efficiency.

  A moving vehicle provided with an exhaust port on the surface of the vehicle has a problem related to aerodynamic noise generated during traveling of the moving vehicle, in addition to a problem regarding reduction of exhaust efficiency during traveling of the moving vehicle. Since this aerodynamic noise increases in proportion to the sixth to eighth power of the traveling speed of the moving vehicle, it rapidly increases as the moving vehicle speeds up.

  On the other hand, demand for environmental conservation is expected to increase in the future, and aerodynamic noise reduction is indispensable for vehicles traveling at high speed. In addition, aerodynamic noise generated during traveling of a moving vehicle is one of the noise sources, and reducing the noise level of the moving vehicle exhaust port is an important issue.

  As a conventional technique for reducing aerodynamic noise from the intake and exhaust ports during traveling of a moving vehicle, for example, as in Patent Document 2, the outer frame shape of the intake and exhaust ports for moving vehicles is made a parallelogram, and further flows through fin-shaped partition plates. Some have proposed to reduce the aerodynamic noise from the periphery of the moving vehicle exhaust port by installing it parallel to the direction.

Japanese Utility Model Publication No. 7-28773 JP 2002-127899 A

  A rectifying member protruding in the ground direction is provided at the front and rear ends of the moving vehicle exhaust port described in Patent Document 1 of the background art.

However, in this patent document 1,
(1) Since the rectifying member is directly exposed to the traveling wind, aerodynamic noise is generated from the rectifying member itself,
(2) The vehicle underfloor height is changed by the installation of the rectifying member at the exhaust port of a moving vehicle having a restriction on the vehicle underfloor height.
(3) The amount of protrusion of the rectifying member in the ground direction is uniform in the direction along the front and rear end portions of the exhaust port in the vehicle traveling direction, and the side cross-sectional shape of the rectifying member with respect to the vehicle traveling direction is Since it is uniform in the direction along the front and rear ends of the vehicle traveling direction, the phase of the separation vortex peeled off by the rectifying member is easily aligned in the direction along the front and rear ends of the exhaust port, leading to an increase in aerodynamic noise. There is.

  In the exhaust port for a moving vehicle described in Patent Document 2, as a measure for reducing aerodynamic noise from the periphery of the exhaust port, the outer frame of the exhaust port is made into a parallelogram or the cross-sectional shape of the inner peripheral end of the outer frame of the exhaust port is 10. It is described that it has a roundness of ˜50 mm. In addition, the partition plate is installed in the exhaust port in parallel with the vehicle traveling direction, and the reinforcing plate is not installed in the exhaust port.

However, in the moving vehicle exhaust port described in Patent Document 2, it is possible to reduce aerodynamic noise using the exhaust port outer frame as a noise source by rounding the inner peripheral end of the exhaust port outer frame. As a result of performing an exhaust test with a configuration of rounding the inner peripheral end of the outer frame of the exhaust port described in Patent Document 2,
(1) An increase in pressure loss during exhaust, that is, a decrease in exhaust efficiency was observed. This decrease in exhaust efficiency is thought to be due to the fact that the traveling wind easily enters the exhaust port by rounding the inner peripheral end of the exhaust port outer frame. In addition, in the moving vehicle exhaust port described in Patent Document 2, the reinforcing plate of the partition plate is not installed.
(2) There is a problem related to the strength of the partition plate. Furthermore, because the partition plate is installed on the same plane as the vehicle surface that is the surface of the opening,
(3) It is considered that aerodynamic noise caused by traveling wind colliding with the partition plate is also a problem.

  Thus, in the prior art, generation of aerodynamic noise generated from the periphery of the exhaust port has been a problem.

  An object of the present invention is to provide a mobile vehicle in which exhaust efficiency of an exhaust port mounted on the mobile vehicle is improved and aerodynamic noise from the periphery of the exhaust port is reduced.

  The object is to provide a moving vehicle having an exhaust port on the surface of the vehicle for exhausting air inside the vehicle to the outside of the vehicle, and the exhaust port is provided with a partition plate for closing the exhaust port. This is achieved by providing projections protruding from the surface of the plate and the outer surface of the vehicle in the traveling direction of the vehicle on the front side and the rear side of the exhaust port.

  Further, the object is achieved by the protrusion being formed by an inclined portion inclined toward the vehicle outer side of the vehicle surface, and a curvature portion having a curvature that is continuous toward the inclined portion and the opening direction of the exhaust port. Is done.

  Further, the above object is achieved by the height at which the protrusion projects from the vehicle surface in the vehicle outer direction changes in a direction along the front and rear ends with respect to the vehicle traveling direction of the exhaust port.

  Further, the above object is achieved by changing the inclination angle of the inclined portion in a direction along the front and rear ends with respect to the vehicle traveling direction of the exhaust port.

  ADVANTAGE OF THE INVENTION According to this invention, the mobile vehicle which improved the exhaust efficiency of the exhaust port mounted in a mobile vehicle and reduced the aerodynamic noise from an exhaust port peripheral part can be provided.

A typical mobile vehicle exhaust port will be described with reference to FIGS.
FIG. 6 is a perspective view of a mobile vehicle having a typical exhaust port.
FIG. 7 is a perspective view of a typical exhaust port.
FIG. 8 is a partial cross-sectional view of the vehicle showing the state of the separation vortex generated from the exhaust port upstream end of the exhaust port shown in FIG.
FIG. 9 is a partial cross-sectional view of the vehicle showing the cause of a decrease in exhaust efficiency due to the exhaust port shown in FIG.
In FIG. 6, reference numeral 4 denotes an exhaust port attached to the left and right side surfaces of the moving vehicle 5. The exhaust port 4 is provided at a position close to the rail 12 (also referred to as a track) and serves as an exhaust port for exhausting the air conditioner mounted in the moving vehicle 5 and the equipment cooling air to the outside of the vehicle.

  In FIG. 7, the exhaust port 4 for the moving vehicle 5 is provided with a fin-like partition plate 2 in the exhaust port outer frame 1 in parallel to the flow direction, and extends in a direction crossing the partition plate 2. It has the reinforcement board 3 connected.

  Now, the main noise source of the exhaust port 4 shown in FIG. 7 is a partition plate 2 and a reinforcing plate 3 having a rear end portion and a fin shape with respect to the vehicle traveling direction of the exhaust port outer frame 1. A separation vortex is generated at the rear end portion with respect to the vehicle traveling direction of the exhaust port outer frame 1 due to the flow separating at the front end portion with respect to the vehicle traveling direction of the exhaust port outer frame 1. The separation vortex collides with the rear end of the exhaust port outer frame 1 with respect to the vehicle traveling direction, thereby generating noise.

  The mechanism of this noise will be described with reference to FIG. 9. When the moving vehicle 5 shown in FIG. 6 travels, a traveling wind A is generated. The exhaust air B is generated by a blower 11 for exhausting heat generated by an air conditioner or the like mounted inside the moving vehicle 5. Since exhaust heat is discharged from the exhaust port 4 by the exhaust air B, the traveling air A is separated at the front end portion of the exhaust port 4 and a separation vortex D is generated. The separation vortex D collides with the reinforcing plate 3, the partition plate 2, and the rear end of the exhaust port 4, thereby causing pressure fluctuation and generating aerodynamic noise. Further, aerodynamic noise is also generated in the partition plate 2 and the reinforcing plate 3 when the traveling wind A collides with the partition plate 2 and the reinforcing plate 3.

  Referring to FIG. 9, the cause of the decrease in exhaust efficiency and the generation of noise during high-speed travel will be described. The vehicle surface 10 is provided with an exhaust port 4, a reinforcing plate 3, and a partition plate 2 for exhausting exhaust air B from the blower 11. In the vehicle, the traveling wind A shown in FIG. 8 enters the exhaust port 4 like the traveling wind C. Since the exhaust wind B is inhibited by the traveling wind C that has entered, the exhaust efficiency is significantly reduced. Further, when the traveling wind C enters the exhaust port 4 and collides with the exhaust wind B, aerodynamic noise is generated.

  Such a typical exhaust port has an exhaust efficiency lowering factor and an aerodynamic noise generation factor. As a result of various investigations of the present invention in order to eliminate this factor, the following embodiments were obtained. Refer to the drawings. The details will be described.

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of an exhaust port provided with an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of a vehicle provided with the first embodiment of the present invention.
1 and 2, a plurality of partition plates 2 are provided in the horizontal direction in the exhaust port 4 for a moving vehicle. A reinforcing support 9 is provided on the partition plate 2 so as to cross. The exhaust port 4 is provided with inclined portions 7 on the front and rear vehicle surfaces 10 with respect to the vehicle traveling direction indicated by the arrows. The inclined portion 7 is inclined in a direction in which the vehicle surface 10 sinks in the direction of the passenger compartment of the vehicle while facing the direction of the exhaust port 4. Further, protrusion inclined portions 8 a and 8 b are provided continuously to the inclined portion 7 at the front and rear end portions of the exhaust port 4 with respect to the vehicle traveling direction. The protrusion inclined portions 8 a and 8 b are inclined toward the exhaust port 4 toward the vehicle outer side of the vehicle surface 10. These protrusion inclined portions 8a and 8b form protrusions 8 that are higher than the surface of the vehicle 10 and the surface of the exhaust port 4. A is traveling wind, and B is exhaust air.

By using the exhaust port 4 having such a configuration, exhaust efficiency is improved and aerodynamic noise around the exhaust port is reduced.
A mechanism for reducing aerodynamic noise will be described below.

  As shown in FIGS. 1 and 2, by providing projections 8 at the front and rear end portions of the exhaust port 4 with respect to the vehicle traveling direction, the traveling wind A during vehicle traveling is biased in the vehicle normal direction on the vehicle surface. The running wind A can be prevented from entering the exhaust port 4. In addition, since the negative pressure region 6 is formed on the opposite side of the protrusion 8 provided at the end of the exhaust port 4 on the front side in the vehicle traveling direction, the exhaust efficiency can be improved.

  On the other hand, since the protrusion 8 is provided with the protrusion inclined portion 8b, it is possible to reduce the collision of the separation vortex at the rear end with respect to the vehicle traveling direction of the exhaust port 4 and the generated aerodynamic noise. .

  Furthermore, by providing the inclined portion 7 on the vehicle surface, the protrusion 8 can be installed without changing the vehicle width, the vehicle height, or the vehicle underfloor height.

  As described above, in this embodiment, it is possible to improve the exhaust efficiency and reduce the aerodynamic noise generated from the periphery of the exhaust port without changing the vehicle width, the vehicle height, or the vehicle underfloor height.

  The gentler the inclination angle of the inclined portion 7 from the vehicle surface to the vehicle surface inner normal direction, the better, but it is preferably 15 degrees or less. From this range, it is desirable to select an optimum angle. In addition, the inclination angle of the protrusion inclined portion 8a from the vehicle surface to the vehicle surface outside normal line is preferably 5 to 25 degrees, and it is desirable to select an optimum angle from this range. Furthermore, a further noise reduction effect can be aimed at by rounding the junction part of the inclination part 7 and the protrusion inclination part 8a.

  If the vehicle travel direction is a moving vehicle having only one direction, the inclined portion 7 and the protrusion 8 may be provided only on the front side of the exhaust port 4 with respect to the vehicle travel direction.

  In the present embodiment, the partition plate 2 and the reinforcing support 9 provided at the exhaust port 4 are provided, but a mesh may be used instead of these members. The reinforcing support 9 may be a round columnar body such as a cylinder. However, in that case, the number of reinforcing supports 9 may be suitably used as appropriate, but preferably two.

  When the exhaust port 4 has a frame or an outer frame, the inclined portion 7 and the protrusion 8 may be provided on the surface of the frame. Moreover, you may provide only the processus | protrusion 8 on the surface of a frame.

FIG. 3 is a diagram showing a second embodiment.
In FIG. 3, in this embodiment, the shape of the protrusions 8 provided at the front and rear end portions of the exhaust port 4 with respect to the vehicle traveling direction is provided with a height difference with respect to the vehicle width direction.

  That is, if all the protrusions 8 have the same height, the separation vortices are aligned to generate a uniform separation vortex, and the aerodynamic noise generated accordingly increases. Therefore, in the present embodiment, the amount of the front surface protruding in the normal direction of the vehicle outside is changed in the direction along the front and rear end portions with respect to the vehicle traveling direction of the exhaust port 4.

  As a result, the phase of the separation vortex generated by the protrusion 8 is not aligned in the direction along the front and rear end portions with respect to the vehicle traveling direction of the exhaust port 4, so aerodynamic noise is reduced. That is, since the protrusion amount of the protrusion 8 is changed, the separation vortex with respect to the exhaust port 4 is dispersed, and aerodynamic noise that has been generated in a lump is dispersed and the noise is reduced.

FIG. 4 is a diagram showing a third embodiment.
In FIG. 4, in the present embodiment, the surface of the protrusion 8 facing in the front-rear direction is corrugated so that the opening length of the exhaust port 4 changes.

  As a result, as described in the second embodiment, the phase of the separation vortex generated by the protrusion 8 is not aligned in the direction along the front and rear end portions with respect to the vehicle traveling direction of the exhaust port 4, so aerodynamic noise is reduced. That is, since the surface of the protrusion 8 is changed, the separation vortex with respect to the exhaust port 4 is dispersed, and aerodynamic noise that has been generated in a lump is dispersed to reduce the noise.

FIG. 5 shows a fourth embodiment of the present invention.
In FIG. 5, in this embodiment, the inclination angle of the inclined portion 7 provided on the front and rear vehicle surfaces with respect to the vehicle traveling direction of the exhaust port 4 is set in the direction along the front and rear ends of the exhaust port 4 with respect to the vehicle traveling direction. The amount of the protrusion 8 provided at the front and rear end portions of the exhaust port 4 in the vehicle traveling direction is changed with respect to the vehicle traveling direction of the exhaust port 4 with respect to the vehicle traveling direction. This is a point that is constant in the direction along the front and rear ends. As a result, not only does the traveling wind A drift in the normal direction of the vehicle outer surface on the vehicle surface, but the traveling wind A can drift in the width direction of the exhaust port 4 and away from the exhaust port 4. Further, the traveling wind A entering the exhaust port 4 can be reduced, and as a result, aerodynamic noise can be reduced and exhaust efficiency can be improved.

  Now, various shapes can be considered for the protrusion 8 provided with the present invention. 10A to 10E show various shapes of the projection 8 that can be considered.

  In FIG. 10, (a) is the one in which the cross-sectional shape of the protrusion 8 provided in the front-rear direction with respect to the vehicle traveling direction of the exhaust port 4 is semicircular. (B) is a triangle. (C) is due to a combination of an inclined portion and a curvature portion. (D) is the shape shown as the first embodiment of the present invention. (E) shows the case where no protrusion is provided.

Therefore, with respect to these protrusion shapes (a) to (d) and no protrusion (e), the flow rates of the traveling wind A flowing into the exhaust port 4 were compared by numerical analysis.
FIGS. 10A to 10E show cross-sectional shapes including a vehicle outer normal direction on the vehicle surface and a vehicle traveling direction. Moreover, FIG. 11 shows a bar graph comparing the flow rate of the traveling wind A flowing into the exhaust port 4 obtained by numerical analysis.

  In FIG. 11, the negative flow rate in the figure indicates the flow rate toward the outside of the exhaust port, indicating that the traveling wind does not enter the exhaust port. From FIG. 11, it can be seen that by providing the protrusions 8 ((a) to (d)), the flow rate is negative, and a flow from the inside of the exhaust port 4 to the outside of the exhaust port 4 is induced. Conversely, when no projection is provided (e), the flow rate is positive, and it can be seen that the traveling wind A has entered the exhaust port 4.

  Similarly, by numerical analysis, the sound source intensity distribution of the fluid noise generated when the protrusion 8 is exposed to the traveling wind A is predicted from the Lilley equation, and the average value of the sound source intensity in a certain closed space is obtained. A bar graph comparing the average values of the sound source intensities is shown in FIG. For simplicity, normalization was performed by setting the average value of the sound source intensity of the exhaust port 4 (e) where the protrusion 8 is not provided as 1.

  In FIG. 12, it can be seen that in any of the cases (a) to (d), the average value of the sound source intensity is increased as compared with (e) in which the protrusion 8 is not provided. However, it can be seen that among the projections (a) to (d), the one having the smallest average value of the sound source intensity is the shape of the first embodiment of (d).

  As described above, according to the present embodiment, it can be said that the first embodiment is a projection that increases the exhaust efficiency and also generates a small amount of aerodynamic noise generated from the projection 8 itself.

  As described above, the present invention prevents the entry of traveling wind into the exhaust port, and forms a negative pressure region behind the protrusion provided at the front and rear end portions of the exhaust port with respect to the vehicle traveling direction. The efficiency can be improved. Further, the projections provided at the front and rear end portions of the exhaust port with respect to the vehicle traveling direction can reduce the collision of the traveling wind with the louver and the reinforcing plate, and aerodynamic noise can be reduced.

  On the other hand, by providing a curvature portion on the projections provided at the front and rear end portions with respect to the vehicle traveling direction of the exhaust port, the generation of separation vortices at the front end portion with respect to the vehicle traveling direction of the exhaust port is reduced. It is possible to reduce the frequency with which the separation vortex generated in the portion collides with the rear end portion with respect to the vehicle traveling direction of the exhaust port, and aerodynamic noise from the periphery of the exhaust port can be reduced. These effects can be achieved without changing the vehicle width, vehicle height, or vehicle floor height of the moving vehicle.

It is a perspective view of the exhaust port provided with one Example of this invention. 1 is a partial cross-sectional view of a vehicle provided with a first embodiment of the present invention. It is a figure which shows a 2nd Example. It is a figure which shows the 3rd Example. It is a figure which shows the 4th Example. It is a perspective view of a mobile vehicle provided with a typical exhaust port. It is a perspective view of a typical exhaust port. FIG. 8 is a partial cross-sectional view of the vehicle illustrating a state of a separation vortex generated from an exhaust port upstream end portion of the exhaust port illustrated in FIG. 7. It is a fragmentary sectional view of the vehicle which shows the exhaust efficiency fall factor by the exhaust port shown in FIG. It is a figure showing the shape of various protrusions. It is the result of calculating | requiring the flow volume which driving | running | working wind flows in into an exhaust port by numerical analysis. It is the result of calculating | requiring the average value of the sound source intensity when a processus | protrusion was exposed to driving | running | working wind by numerical analysis.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust port outer frame 2 Partition plate 3 Reinforcement plate 4 Exhaust port 5 Moving vehicle 6 Negative pressure area 7 Inclined part (inclined vehicle surface)
8 Protrusions 8a, 8b Protruding slope 9 Reinforcing support 10 Vehicle surface D Separation vortex at front end of exhaust port

Claims (4)

In a mobile vehicle provided with an exhaust port for exhausting air inside the vehicle to the outside of the vehicle,
The exhaust port is provided with a partition plate for closing the exhaust port, and a protrusion projecting from the surface of the partition plate and the outer surface of the vehicle is a traveling direction of the vehicle, and a front side of the exhaust port. A moving vehicle provided on the rear side. The mobile vehicle according to claim 1,
The mobile vehicle is characterized in that the protrusion is formed by an inclined portion inclined toward the vehicle outer side of the vehicle surface, and a curvature portion having a curvature that is continuous toward the inclined portion and the opening direction of the exhaust port. The mobile vehicle according to claim 1,
A moving vehicle characterized in that the height of the protrusion protruding in the vehicle outer direction on the vehicle surface changes in a direction along the front and rear ends with respect to the vehicle traveling direction of the exhaust port. The mobile vehicle according to claim 1,
The moving vehicle, wherein an inclination angle of the inclined portion changes in a direction along a front and rear end with respect to a vehicle traveling direction of the exhaust port.

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