CN104458196A - Shutter type mechanism for generating horizontal shear airflow in conventional wind tunnel in simulation mode and method - Google Patents
Shutter type mechanism for generating horizontal shear airflow in conventional wind tunnel in simulation mode and method Download PDFInfo
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- CN104458196A CN104458196A CN201410605649.6A CN201410605649A CN104458196A CN 104458196 A CN104458196 A CN 104458196A CN 201410605649 A CN201410605649 A CN 201410605649A CN 104458196 A CN104458196 A CN 104458196A
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Abstract
The invention relates to a shutter type mechanism for generating horizontal shear airflow in a conventional wind tunnel in a simulation mode and a method. The shutter type mechanism for generating the horizontal shear airflow in the conventional wind tunnel in the simulation mode comprises a fixed support fixedly connected to the ground and a windward plate body which is installed on the fixed support in the vertical direction and used for converting horizontal airflow into the horizontal shear airflow, the windward plate body is arranged on the windward face of a high-speed railway bridge and provided with a plurality of ventilating holes used for ventilation, and a driving mechanism is arranged on the side of the windward plate body and used for driving the windward plate body to move in the vertical direction and controlling the moving speed of the windward plate body. The horizontal shear airflow different in flow rate is achieved, and therefore the simulation requirements under various conditions are met.
Description
Technical field
The present invention relates to shear simulation of air flow technical field in conventional wind-tunnel, be specifically related to a kind of shutter mechanism at the horizontal shear air-flow of conventional tunnel simulation generation; Also relate to a kind of method by the horizontal shear air-flow of shutter mechanism analog generation in conventional wind-tunnel simultaneously.
Background technology
Shear air-flow refers to a kind of air-flow phenomenon that air speed or direction change suddenly, can be divided into 3 kinds of main Types such as horizontal shear and vertical wind shear of horizontal vertical wind shear, horizontal wind.Train is mainly subject to the impact of horizontal shear air-flow, and this shear wind is the one of the main reasons causing train charming appearance and behaviour to be toppled.Such as, the South Sinkiang train capsizing case causal investigation result occurred for 2007 shows, the unexpected shear of air-flow plays key player; In the charming appearance and behaviour capsizing case that Japan occurs nearly two more than ten years, the I portion bridge accident of 1986, root room, Hokkaido line accident of 1994, three Lu Tiedao accidents, 1998 build fertile line accident etc., all regarded as the wind-induced train capsizing case of shear by accident investigation board.Along with the development of high-speed railway, the aerodynamic characteristic of bullet train under shear wind effect causes the very big concern of people.
Wind tunnel test is one of main effective means of research train pneumatic characteristic, it is the prerequisite obtaining authentic experiments result that accurate simulation carrys out properties of flow, but what conventional wind-tunnel produced is all smooth air, directly can not produce the shear air-flow with wind speed, wind direction flip-flop characteristic.Therefore, be the aerodynamic characteristic of research shear wind effect Train, need horizontal shear air-flow method for generation in a kind of conventional wind-tunnel of research and development.
Summary of the invention
The technical problem to be solved in the present invention is, the problem of shear air-flow directly can not be produced for conventional wind-tunnel, the shutter mechanism of a kind of conventional tunnel simulation generation horizontal shear air-flow and the method for the horizontal shear air-flow of conventional tunnel simulation generation are provided, can automatic lifting and with the shutter mechanism of perforate by arranging in a distance, model upstream, the horizontal shear of test model place air-flow is realized by the unexpected lifting of this mechanism, the method can adjust duration and the magnitude range of the change of air-flow shear hourly velocity easily, with the shear air-flow of the various characteristic of accurate simulation.
For achieving the above object, the technical solution adopted in the present invention is: shutter mechanism is arranged on a distance, model upstream, mechanism height should be greater than the height of test model; Rotation axis is inserted the rotation axis hole of shutter mechanism and the hole of plate body windward, install fixing; Rotated around different directions by driven by motor rotation axis, realize rise or the landing of shutter mechanism, wherein the unexpected decline of shutter mechanism can realize the unexpected increase of test model place wind speed, and rise suddenly the unexpected reduction that can realize wind speed, rising or falling speed can control the length of Wind Speed Shear time; Uniform air-permeating hole in shutter mechanism, hole area is percentage of open area with the ratio of mechanism's total area, by regulating the wind speed size at percentage of open area size adjustable shutter mechanism downstream model place, to control velocity magnitude amplitude of variation before and after air-flow shear.
Preferentially, the rotation that the lifting of shutter mechanism controls the rotating shaft of shutter mechanism by a set of automation control system realizes, automation control system comprises direct supply, programmable logic controller (PLC), DC relay, power switch box, minisize dc reducing motor and rotation axis, rotation axis is driven to rotate around different directions by minisize dc reducing motor, realize rise or the landing of mechanism, and different two-way rocking bar power switch control is set.
Preferentially, the axis of rotation speed of shutter mechanism can be controlled by automation control system, and can obtain different rotating speeds easily, thus controls the rising or falling speed of shutter mechanism, and then controls the duration of air-flow shear hourly velocity change.
Preferentially, shutter mechanism evenly lays some holes, can by the adjustment quantity of via holes and size to change the size of percentage of open area, thus control shutter mechanism and rise or the wind speed size at the front model place of landing, realize the shear between different size wind speed.
For achieving the above object, the technical solution adopted in the present invention is: a kind of conventional tunnel simulation produces the shutter mechanism of horizontal shear air-flow, comprise the fixed support that is fixed in ground and to be vertically arranged on fixed support and plate body windward for horizontal gas flow being changed into horizontal shear air-flow, plate body is located at the windward side of high-speed railway bridge windward, windward plate body offers multiple for ventilative air-permeating hole, the plate side of plate body is provided with and vertically moves for ordering about plate body windward and control the driving mechanism of plate body translational speed windward windward.
Preferably, driving mechanism comprise be rotatably connected to plate body plate side windward rotation axis, be located at rotation axis two ends and for guiding the pickup groove of rotation axis moving direction and the power source for driving rotation axis in rotary moving in pickup groove; Pickup groove is vertically fixed on fixed support, and rotation axis is arranged along the direction perpendicular to pickup groove, and rotation axis two ends rollably fix respectively in the pickup groove at rotation axis two ends.
Preferably, driving mechanism comprises the cylinder being arranged at plate body plate side windward, and the outbound course of cylinder is arranged along the moving direction of plate body windward; Plate body is mounted in gathering sill windward, and gathering sill is arranged along the moving direction of plate body windward.
Preferably, air-permeating hole is provided with the perforate governor motion for regulating bore size.
Preferably, perforate governor motion adopts the orifice plate matched with the air-permeating hole on plate body surface windward, makes the hole on the air-permeating hole of plate body windward and orifice plate misplace thus regulate the pore size of air-permeating hole by regulating orifice plate and the relative position relation of plate body windward.
Preferably, perforate governor motion adopts stopple, by the pore size regulating the relative distance of stopple and air-permeating hole to regulate air-permeating hole.
For achieving the above object, another technical scheme of the present invention is: a kind of method producing horizontal shear air-flow in conventional wind-tunnel, shutter mechanism is arranged on the upstream of train model, the windward side of shutter mechanism has been evenly arranged air-permeating hole, ventilative rate is regulated, for controlling velocity magnitude variation range before and after air-flow shear by the size and number changing air-permeating hole; Lower end and the ground of shutter mechanism are fixed, and be connected with the plate body windward of shutter mechanism by rotation axis, shutter mechanism drives rotation axis to rotate by driving mechanism and is vertically elevated to control plate body windward, the velocity of rotation of rotation axis is changed by programmable logic controller (PLC) controls driving mechanism, thus change the rising or falling speed of shutter mechanism, and then regulate the time length of wind speed mutation.
Preferably, shutter mechanism is controlled as the lifting of driving mechanism to shutter mechanism automatically by motor, is realized the air-flow shear at tests column vehicle model place by the unexpected lifting of plate body windward.
Preferably, the height of shutter mechanism is greater than the height of train model to be tested.
Preferably, rotation axis is inserted the rotation axis hole of shutter mechanism, rotated around different directions by driven by motor rotation axis, realize rise or the landing of shutter mechanism, wherein the unexpected decline of shutter mechanism is to realize the unexpected increase of train model place to be tested wind speed, the unexpected rise of shutter mechanism is to realize the unexpected reduction of wind speed, and rising or falling speed is used for the length of controlled wind speed switching time.
Shutter mechanism is arranged on a distance, model upstream, mechanism height should be greater than the height of test model; Rotation axis is inserted the rotation axis hole of shutter mechanism and the hole of plate, install fixing.Rotated around different directions by driven by motor rotation axis, realize rise or the landing of shutter mechanism, wherein the unexpected decline of shutter mechanism can realize the unexpected increase of test model place wind speed, and rise suddenly the unexpected reduction that can realize wind speed, rising or falling speed can control the length of Wind Speed Shear time.Uniform air vent in shutter mechanism, hole area is percentage of open area with the ratio of mechanism's total area, by regulating the wind speed size at percentage of open area size adjustable shutter mechanism downstream model place, to control velocity magnitude amplitude of variation before and after air-flow shear.
Preferentially, the rotation that the lifting of shutter mechanism controls the rotating shaft of shutter mechanism by a set of automation control system realizes, this system comprises the compositions such as direct supply, programmable logic controller (PLC), DC relay, power switch box, minisize dc reducing motor and rotation axis, rotation axis is driven to rotate around different directions by minisize dc reducing motor, realize rise or the landing of mechanism, and different two-way rocking bar power switch control is set.
Preferentially, the axis of rotation speed of shutter mechanism can be controlled by automation control system, and can obtain different rotating speeds easily, thus controls the rising or falling speed of shutter mechanism, and then controls the duration of air-flow shear hourly velocity change.
Preferentially, shutter mechanism evenly lays some holes, can by the adjustment quantity of via holes and size to change the size of percentage of open area, thus control shutter mechanism and rise or the wind speed size at the front model place of landing, realize the shear between different size wind speed.
The method of horizontal shear air-flow is produced in conventional wind-tunnel, apart from a distance, model upstream, shutter mechanism is being installed, rotated the rise or the landing that realize shutter mechanism around different directions by driven by motor rotation axis, realized the horizontal shear of test model air-flow by the unexpected lifting of shutter mechanism, rising or falling speed can control the length of Wind Speed Shear time.Due to air-permeating hole uniform in shutter mechanism, by regulating the wind speed size at percentage of open area size adjustable shutter mechanism downstream model place, to control velocity magnitude variation range before and after air-flow shear.The method can the shear air-flow of the various characteristic of accurate simulation, and the scope of application is wider.
Beneficial effect of the present invention is:
The conventional tunnel simulation of the present invention produces the shutter mechanism of horizontal shear air-flow, by arrange in the windward side of high-speed railway bridge can vertically movement plate body windward and on plate body windward, offer air-permeating hole simulate required horizontal shear air-flow, by the translational speed of driving mechanisms control plate body windward, thus realize the horizontal shear air-flow of different in flow rate, thus meet the simulation needs under various situation.
Below in conjunction with accompanying drawing, patent of the present invention is described further.
Accompanying drawing explanation
Fig. 1 is the structural representation of the shutter mechanism of the horizontal shear air-flow of conventional tunnel simulation generation of the embodiment of the present invention;
Fig. 2 is the structural representation of the shutter mechanism of the embodiment of the present invention.
Wherein 1 is fixed support; 2 is plate body windward; 3, high-speed railway bridge; 4, air-permeating hole; 5, driving mechanism; 501, pickup groove; 502, rotation axis; 503, power source.
Embodiment
Further illustrating below to patented technology content of the present invention, but the restriction not to patent flesh and blood of the present invention.
Fig. 1 is the structural representation of the shutter mechanism of the horizontal shear air-flow of conventional tunnel simulation generation of the embodiment of the present invention; Fig. 2 is the structural representation of the shutter mechanism of the embodiment of the present invention.
The embodiment of the present invention, a kind of conventional tunnel simulation produces the shutter mechanism of horizontal shear air-flow, comprise the fixed support 1 that is fixed in ground and to be vertically arranged on fixed support 1 and plate body windward 2 for horizontal gas flow being changed into horizontal shear air-flow, plate body 2 is located at the windward side of high-speed railway bridge 3 windward, windward plate body 2 offers multiple for ventilative air-permeating hole 4, the plate side of plate body 2 is provided with and vertically moves and the driving mechanism 5 controlling plate body 2 translational speed windward for ordering about plate body 2 windward windward.
It is also, driving mechanism 5 comprise be rotatably connected to plate body 2 plate side windward rotation axis 502, be located at rotation axis 502 two ends and for guiding the pickup groove 501 of rotation axis 502 moving direction and the power source 503 for driving rotation axis 502 in rotary moving in pickup groove 501; Pickup groove 501 is vertically fixed on fixed support 1, and rotation axis 502 is arranged along the direction perpendicular to pickup groove 501, and rotation axis 502 two ends rollably fix respectively in the pickup groove 501 at rotation axis 502 two ends.
It is also, driving mechanism 5 comprises the cylinder being arranged at plate body 2 plate side windward, and the outbound course of cylinder is arranged along the moving direction of plate body 2 windward; Plate body 2 is mounted in gathering sill windward, and gathering sill is arranged along the moving direction of plate body 2 windward.
It is also, air-permeating hole 4 is provided with the perforate governor motion for regulating bore size.
It is also, perforate governor motion adopts the orifice plate matched with the air-permeating hole 4 on plate body 2 surface windward, makes the air-permeating hole 4 of plate body 2 windward misplace with the hole on orifice plate thus regulate the pore size of air-permeating hole 4 by regulating orifice plate and the relative position relation of plate body 2 windward.
It is also, perforate governor motion adopts stopple, by the pore size regulating the relative distance of stopple and air-permeating hole 4 to regulate air-permeating hole 4.
The embodiment of the present invention, the method of horizontal shear air-flow is produced in a kind of conventional wind-tunnel, shutter mechanism is arranged on the upstream of train model, the windward side of shutter mechanism has been evenly arranged air-permeating hole 4, ventilative rate is regulated, for controlling velocity magnitude variation range before and after air-flow shear by the size and number changing air-permeating hole 4; Lower end and the ground of shutter mechanism are fixed, and be connected with the plate body windward 2 of shutter mechanism by rotation axis 502, shutter mechanism drives rotation axis 502 to rotate to control plate body 2 windward by driving mechanism 5 and is vertically elevated, the velocity of rotation of rotation axis 502 is changed by programmable logic controller (PLC) controls driving mechanism 5, thus change the rising or falling speed of shutter mechanism, and then regulate the time length of wind speed mutation.
It is also, shutter mechanism is controlled automatically by the lifting of motor as driving mechanism 5 pairs of shutter mechanisms, is realized the air-flow shear at tests column vehicle model place by the unexpected lifting of plate body 2 windward.
It is also, the height of shutter mechanism is greater than the height of train model to be tested.
It is also, rotation axis 502 is inserted rotation axis 502 hole of shutter mechanism, rotated around different directions by driven by motor rotation axis 502, realize rise or the landing of shutter mechanism, wherein the unexpected decline of shutter mechanism is to realize the unexpected increase of train model place to be tested wind speed, the unexpected rise of shutter mechanism is to realize the unexpected reduction of wind speed, and rising or falling speed is used for the length of controlled wind speed switching time.
Embodiment 1
In described conventional wind-tunnel, the step of shear air-flow method for generation is:
With reference to figure 1, shutter mechanism of the present invention is arranged on the upstream of test model, and the windward side of shutter mechanism is evenly arranged air-permeating hole 4, and air-permeating hole 4 can be rectangle or circle, regulates ventilative rate by the size and number changing air-permeating hole 4.Plate body 2 is fixed on ground by fixed support 1 windward, and lower end and the ground of shutter mechanism are fixed, and shutter mechanism is connected with plate body 2 windward by rotation axis 502.Shutter mechanism is plate profile structure, by changing different ventilative rates, reaches different wind speed; Shutter mechanism rotates through the rotation realization that motor (power source 503) controls rotation axis 502, and control by programmable logic controller (PLC) (prior art) speed that motor (power source 503) changes rotation axis 502, thus change the time of wind speed mutation.
Embodiment 2
Shear air-flow method for generation in a kind of conventional wind-tunnel, as shown in Figure 1, for high-speed railway bridge 2 and train, in model upstream, shutter mechanism is installed, the windward side of shutter mechanism is evenly arranged air-permeating hole 4, air-permeating hole 4 can be rectangle or circle, regulates ventilative rate by the size and number changing air-permeating hole 4; The height of shutter mechanism can not lower than the height sum of train model, bridge model and bridge pier model; Plate body 2 is fixed on ground windward, and lower end and the ground of shutter mechanism are fixed, and shutter mechanism is connected with plate body 2 windward by rotation axis 502.
During test, regulate wind speed amplitude of variation before and after incoming flow shear by changing shutter mechanism ventilative rate size, the wind speed mutation time is then realized by the rising or falling speed of Electric Machine Control shutter mechanism, accordingly can the horizontal shear wind of the various characteristic of accurate simulation.
The invention belongs to one of primary study content of project of national nature science fund project (51322808), for running train aeroperformance and safety traffic provide more accurate wind tunnel test means, thus provide technical support for what guarantee bullet train safe operation.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing description of the present invention to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a conventional tunnel simulation produces the shutter mechanism of horizontal shear air-flow, it is characterized in that, comprise the fixed support that is fixed in ground and to be vertically arranged on fixed support and plate body windward for horizontal gas flow being changed into horizontal shear air-flow, plate body is located at the windward side of high-speed railway bridge windward, windward plate body offers multiple for ventilative air-permeating hole, the plate side of plate body is provided with and vertically moves for ordering about plate body windward and control the driving mechanism of plate body translational speed windward windward.
2. conventional tunnel simulation according to claim 1 produces the shutter mechanism of horizontal shear air-flow, it is characterized in that, driving mechanism comprise be rotatably connected to plate body plate side windward rotation axis, be located at rotation axis two ends and for guiding the pickup groove of rotation axis moving direction and the power source for driving rotation axis in rotary moving in pickup groove; Pickup groove is vertically fixed on fixed support, and rotation axis is arranged along the direction perpendicular to pickup groove, and rotation axis two ends rollably fix respectively in the pickup groove at rotation axis two ends.
3. conventional tunnel simulation according to claim 1 produces the shutter mechanism of horizontal shear air-flow, and it is characterized in that, driving mechanism comprises the cylinder being arranged at plate body plate side windward, and the outbound course of cylinder is arranged along the moving direction of plate body windward; Plate body is mounted in gathering sill windward, and gathering sill is arranged along the moving direction of plate body windward.
4. conventional tunnel simulation according to any one of claim 1 to 3 produces the shutter mechanism of horizontal shear air-flow, it is characterized in that, air-permeating hole is provided with the perforate governor motion for regulating bore size.
5. conventional tunnel simulation according to claim 4 produces the shutter mechanism of horizontal shear air-flow, it is characterized in that, perforate governor motion adopts the orifice plate matched with the air-permeating hole on plate body surface windward, makes the hole on the air-permeating hole of plate body windward and orifice plate misplace thus regulate the pore size of air-permeating hole by regulating orifice plate and the relative position relation of plate body windward.
6. conventional tunnel simulation according to claim 4 produces the shutter mechanism of horizontal shear air-flow, it is characterized in that, perforate governor motion adopts stopple, by the pore size regulating the relative distance of stopple and air-permeating hole to regulate air-permeating hole.
7. in a conventional wind-tunnel, produce the method for horizontal shear air-flow, it is characterized in that, shutter mechanism is arranged on the upstream of train model, the windward side of shutter mechanism has been evenly arranged air-permeating hole, ventilative rate is regulated, for controlling velocity magnitude variation range before and after air-flow shear by the size and number changing air-permeating hole; Lower end and the ground of shutter mechanism are fixed, and be connected with the plate body windward of shutter mechanism by rotation axis, shutter mechanism drives rotation axis to rotate by driving mechanism and is vertically elevated to control plate body windward, the velocity of rotation of rotation axis is changed by programmable logic controller (PLC) controls driving mechanism, thus change the rising or falling speed of shutter mechanism, and then regulate the time length of wind speed mutation.
8. in conventional wind-tunnel according to claim 7, produce the method for horizontal shear air-flow, it is characterized in that, shutter mechanism is controlled as the lifting of driving mechanism to shutter mechanism automatically by motor, is realized the air-flow shear at tests column vehicle model place by the unexpected lifting of plate body windward.
9. produce the method for horizontal shear air-flow in conventional wind-tunnel according to claim 7, it is characterized in that, the height of shutter mechanism is greater than the height of train model to be tested.
10. in conventional wind-tunnel according to claim 7, produce the method for horizontal shear air-flow, it is characterized in that, rotation axis is inserted the rotation axis hole of shutter mechanism, rotated around different directions by driven by motor rotation axis, realize rise or the landing of shutter mechanism, wherein the unexpected decline of shutter mechanism is to realize the unexpected increase of train model place to be tested wind speed, and the unexpected rise of shutter mechanism is to realize the unexpected reduction of wind speed, and rising or falling speed is used for the length of controlled wind speed switching time.
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| CN111060279A (en) * | 2019-12-31 | 2020-04-24 | 武汉武船重型装备工程有限责任公司 | Rotary wind tunnel isolation door |
| CN114383803A (en) * | 2022-03-22 | 2022-04-22 | 西南交通大学 | Wind tunnel test device for aerodynamic characteristics of pseudo-dynamic vehicle-bridge |
| CN114509232A (en) * | 2022-01-20 | 2022-05-17 | 中国空气动力研究与发展中心高速空气动力研究所 | Modular hole wall device for wind tunnel test |
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| CN204128775U (en) * | 2014-10-31 | 2015-01-28 | 中南大学 | Conventional tunnel simulation produces the shutter mechanism of horizontal shear air-flow |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060279A (en) * | 2019-12-31 | 2020-04-24 | 武汉武船重型装备工程有限责任公司 | Rotary wind tunnel isolation door |
| CN111060279B (en) * | 2019-12-31 | 2022-03-01 | 武汉武船重型装备工程有限责任公司 | Rotary wind tunnel isolation door |
| CN114509232A (en) * | 2022-01-20 | 2022-05-17 | 中国空气动力研究与发展中心高速空气动力研究所 | Modular hole wall device for wind tunnel test |
| CN114509232B (en) * | 2022-01-20 | 2023-08-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Hole wall device for modularized wind tunnel test |
| CN114383803A (en) * | 2022-03-22 | 2022-04-22 | 西南交通大学 | Wind tunnel test device for aerodynamic characteristics of pseudo-dynamic vehicle-bridge |
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