CN114872744A - Aerodynamic lift force is train lift wing system in coordination based on high-speed railway clearance constraint - Google Patents
Aerodynamic lift force is train lift wing system in coordination based on high-speed railway clearance constraint Download PDFInfo
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- CN114872744A CN114872744A CN202210584447.2A CN202210584447A CN114872744A CN 114872744 A CN114872744 A CN 114872744A CN 202210584447 A CN202210584447 A CN 202210584447A CN 114872744 A CN114872744 A CN 114872744A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D17/00—Construction details of vehicle bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D17/00—Construction details of vehicle bodies
- B61D17/02—Construction details of vehicle bodies reducing air resistance by modifying contour ; Constructional features for fast vehicles sustaining sudden variations of atmospheric pressure, e.g. when crossing in tunnels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
Abstract
The invention discloses a high-speed rail clearance constraint-based aerodynamic lift force coordinated train lift force wing system, which comprises a lift force wing system, wherein the lift force wing system comprises a first lifting wing system and a second lifting wing system; the lifting wing system is arranged on the top of the train and is limited below the contact net; the same lifting wing system is arranged on each carriage of the train; the heights of a plurality of horizontal lifting wings in the lifting wing system are raised from the front end of the carriage to the rear end of the carriage in an equal difference mode. The invention generates the lifting force facing upwards vertically through the synergistic action of the lifting wings arranged on the upper part of the train carriage, thereby greatly reducing the pressure between the high-speed train hub and the track, increasing the carrying capacity of the high-speed train, and reducing the loss of the train hub and the train operation cycle cost. The layout mode of gradual rising is adopted, the aerodynamic interference among the plurality of the lift wings is effectively reduced, so that the aerodynamic performance of the lift wing system is ensured, the sufficient lift force generated by the lift wings is ensured, and the pressure of a train on the rail is greatly reduced.
Description
Technical Field
The invention relates to the field of railway aerodynamics, in particular to a pneumatic lift force cooperated train lift force wing system based on high-speed rail limit constraint.
Background
With the rapid development of the Chinese high-speed rail technology, the Chinese high-speed rail is innovated independently from the introduction, digestion and absorption, and is now brought to the world, so that the Chinese high-speed rail becomes a new 'exterior business card' in China. In order to further promote the development of the Chinese high-speed rail, the technical storage research and development of a high-speed wheel-rail passenger train system with the speed of 400 kilometers per hour reasonably and comprehensively are put forward in the compendium of construction of the traffic force country. Although the re-acceleration of the high-speed train can further shorten the space-time distance of high-speed railway transportation and provide first-class high-quality, high-safety and high-tech traffic service for China and even the world, the wheel wear of the wheel rail train is increased along with the acceleration of the train speed, and the turning cycle and the service life of the wheel are necessarily shortened.
Compared with published patents and papers, the bionic wing with the imitated airplane wing structure is additionally arranged at the same height on each carriage to generate uplifting force, so that the uplifting force can be provided for a train running on a high-speed rail, and the pressure of the train on the rail is reduced. However, the method is not fully combined with the development practice of high-speed railways in China: 1. the influence of the railway clearance is not fully taken into account. The railroad clearance standard is an important basic standard for railways and specifies contour dimension lines that buildings, equipment and rolling stock cannot exceed. Has close relation with railway transportation, operation safety, engineering construction, work maintenance and the like. The total mileage of the built high-speed rail in China breaks through 3.5 kilometers, and huge basic investment waste is caused by incompatibility of the conventional railway clearance. 2. A plurality of lifting wings are arranged at the same height on a high-speed rail carriage, and the flow among the lifting wings is complex. The downwash of the front wing, the wall interference of the carriage, the interference between the wings and the like can have obvious influence on the aerodynamic performance of the rear wing. The lifting force coefficient loss of the lifting force wing is very serious by adopting the arrangement at the same height.
Disclosure of Invention
The invention aims to provide a high-speed rail clearance constraint-based aerodynamic lift force coordinated train lift force wing system, which aims to solve the problems in the prior art, utilizes a high-speed rail aerodynamic theory, considers the influence of a high-speed rail carriage on the lift force wings and the interference among the lift force wings and the like, and provides a lift force wing layout system suitable for an aerodynamic lift force coordinated train; the purposes of prolonging the service life of the train, reducing the cycle cost and reducing the energy consumption of the train operation are achieved.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a high-speed rail clearance constraint-based aerodynamic lift force cooperative train lift force wing system, which comprises a lift force wing system, a lift force wing system and a control system, wherein the lift force wing system comprises a lift force wing system and a control system; the lifting wing system is arranged on the top of the train and is limited below the contact net; the same lifting wing system is arranged on each carriage of the train; the heights of a plurality of horizontal lifting wings in the lifting wing system are raised in an equal difference manner from the front end of the carriage to the rear end of the carriage.
The lifting wing system also comprises a plurality of wing supporting rods; the bottom of the wing support rod is fixedly arranged in the middle of the top surface of the carriage, and the top of the wing support rod is fixedly connected with the middle of the bottom surface of the horizontal lifting wing.
The horizontal distance d between adjacent horizontal lifting wings 1 Comprises the following steps: d 1 ＝(L-N*C)/N；
Wherein L is the length of the carriage; n is the number of the horizontal lifting wings; and C is the chord length of the horizontal lift force.
The closest distances between the two horizontal lifting wings at the two ends of the carriage and the end part of the carriage are d 1 /2。
The height difference d between adjacent horizontal lifting wings 2 Is d is 2 ＝(D-H-D 1 )/(N-1)；
Wherein D is the height from the contact net to the top surface of the train; h is the height of the horizontal lifting wing at the front end of the carriage; d 1 The height of the horizontal lifting wing from the overhead line system at the rear end of the carriage is shown.
H is more than or equal to 900mm and H is less than or equal to 1100 mm; said D 1 ≥900mm。
The aspect ratio of the horizontal lift wing is 5-8, the wing span length is 3000mm-3400mm, and the stall attack angle of the horizontal lift wing is 16-18 degrees.
The attack angle of each horizontal lift wing is independently adjustable, and the adjustment range of the attack angle is 0 degree to the maximum stalling attack angle.
The horizontal lift wing is a straight wing designed based on a high-lift wing profile, the relative thickness of the wing profile is 20%, and the maximum camber is located at 40% chord length.
The invention discloses the following technical effects: according to the layout scheme of the pneumatic cooperative lift train based on the constraint of the high-speed rail clearance, the lift force facing upwards in the vertical direction is generated through the cooperative action of the lift force wings arranged on the upper part of the train in the running process of the train, so that the pressure between a high-speed rail hub and a rail is greatly reduced, the carrying capacity of a high-speed train is increased, and the loss of the train hub and the running period cost of the train are reduced. The method is compatible with the existing high-speed railway infrastructure, and has the advantages of simple implementation, easy installation, low cost, greenness and no pollution.
The layout mode of gradual rising is adopted, aerodynamic interference among the plurality of the lift wings is effectively reduced, so that the aerodynamic performance of each group of the lift wings is guaranteed, the lift wings are guaranteed to generate enough lift, and the pressure of a train on a rail is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a diagram of a prior art high speed railway clearance constraint;
FIG. 2 is a front view of a layout of an aerodynamic lift force cooperating train;
FIG. 3 is a top view of the aerodynamic lift force cooperating train layout;
fig. 4 is a schematic view of a lifting wing structure.
Wherein, 1, bridge and tunnel limitation; 2. a catenary; 3. a region of the lifting wing can be arranged; 4. a train; 5, rail surfaces; 6. a horizontal lift wing; 7. a wing support rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
A aerodynamic lift force cooperation train lift wing system based on high-speed rail limit constraint comprises a lift wing system; the lifting wing system is arranged at the top of the train 4 and limited below the overhead line system 2; each carriage of the train 4 is provided with the same lifting wing system; the heights of a plurality of horizontal lifting wings 6 in the lifting wing system are raised from the front end of the carriage to the rear end of the carriage in an equal difference mode.
The lifting wing system also comprises a plurality of wing support rods 7; the bottom of the wing support rod 7 is fixedly arranged in the middle of the top surface of the carriage, and the top of the wing support rod 7 is fixedly connected with the middle of the bottom surface of the horizontal lifting wing 6.
Furthermore, when the train is viewed from the side, the whole lifting wing system of the carriage takes a single carriage as a unit, and the horizontal lifting wings 6 are distributed in a step shape.
Horizontal spacing d of adjacent horizontal lifting wings 6 1 Comprises the following steps: d 1 ＝(L-N*C)/N；
Wherein L is the length of the carriage; n is the number of the horizontal lifting wings; and C is the horizontal lift chord length.
The two horizontal lifting wings 6 at the two ends of the carriage have the nearest distances d from the ends of the carriage 1 /2。
Furthermore, the distance between two horizontal lifting wings 6 close to each other on the two carriages is d 1 。
Height difference d between adjacent horizontal lift wings 6 2 Is d is 2 ＝(D-H-D 1 )/(N-1)；
Wherein D isTrain with touching distance4A top surface height; h is the height of the horizontal lifting wing at the front end of the carriage; d 1 The height of the horizontal lifting wing from the overhead line system at the rear end of the carriage is shown.
H is more than or equal to 900mm and H is less than or equal to 1100 mm; d 1 ≥900mm。
The aspect ratio of the horizontal lifting wing 6 is 5-8, the wing span length is 3000mm-3400mm, and the stall attack angle of the horizontal lifting wing 6 is 16-18 degrees.
The angle of attack of each horizontal lift wing 6 is individually adjustable, and the adjustment range of the angle of attack is 0 DEG to the maximum stall angle of attack.
The horizontal-lift wing 6 is a straight wing designed based on a high-lift wing profile, the relative thickness of the wing profile is 20%, and the maximum camber is located at 40% chord length.
The first embodiment is as follows:
fig. 1 shows the restriction of the existing railway clearance, the layout of the lift wing of the pneumatic coordinated lift train is restricted by the existing high-speed railway bridge and tunnel clearance 1, the contact network 2 and the train 4, and the position of the area 3 where the lift wing can be arranged is very limited. The width of the carriage of the existing high-speed train in China is generally 3.4m, and the span length of the restraint wing is 3.4 m. The height from the top of the train 4 to the bridge-tunnel boundary is 2.4m, so that the wing layout height needs to be further restricted in order to avoid the wall interference between the wings and the tunnel wall and also consider the interference influence of a contact net on the wings in extreme weather. GB146 "standard gauge railway clearance": the height of the contact net from the ground is 5.65m, the height of a high-speed railway carriage is generally 3.7m, and the height of the carriage from the ground is 0.35 m. The distance between the top of the carriage and the overhead line system is 1.6m, and the interference between the overhead line system and the lift wing is prevented. The height of the wing from the top of the high-speed railway carriage is limited to 1.5 m.
Further, under the limit constraint of fig. 1, the lift wing layout of the aerodynamic combined lift train is shown in fig. 2 and fig. 3. 6 horizontal lift wings 6 are arranged above the top of the single-section carriage, the attack angle of each horizontal lift wing 6 is independently controlled, and the regulation range of the attack angle of each horizontal lift wing 6 is 0-17 degrees; the height of each horizontal lifting wing 6 from the top of the carriage is different, the height of the horizontal lifting wing 6 at the front end of the carriage from the top of the carriage is 1000mm, the heights of the wings from the top of the carriage are sequentially increased by 100mm, and the height of the sixth wing from the top of the carriage is 1500 mm. The wings are uniformly distributed at equal intervals in the horizontal direction, and the wing interval is 4200 mm.
Further, in the present embodiment, as shown in fig. 4, the horizontal-lift wing 6 is a straight wing, the span length of the wing is 3000mm, the wing chord length is 600mm, the characteristic area of the horizontal-lift wing 6 is 1.8 square meters, and the attack angle is 16 °.
According to the formula of the lift force: 1/2 ρ C L V 2 S (lift is 1/2 × air density × lift coefficient × train running speed squared × horizontal wing characteristic area).
Where the air density ρ is 1.225 kilograms per cubic meter and the train speed V is 400 kilometers per hour (111.112 meters per second). The characteristic area of the wing is 1.8 square meters (at the moment, the length of a straight wing span is 3 meters, the chord length is 0.6 meter, and the aspect ratio is 5); coefficient of lift C L Taking a simulation result of a numerical value when the angle of attack of the wing is 16 degrees: the lift coefficient of the first airfoil is 1.5803; the second airfoil lift coefficient is 1.106; the third airfoil lift coefficient is 0.965; the fourth airfoil lift coefficient is 0.976; the lift coefficient of a fifth blade machine wing is 1.013; the sixth airfoil lift coefficient was 1.05. The lift force of the six bionic wings is as follows:
first flap lift:
Y 1 ＝1/2ρC L1 V 2 S＝1/2×1.225×1.5803×111.112 2 ×1.8＝21510(N)
second blade lift:
Y 2 ＝1/2ρC L2 V 2 S＝1/2×1.225×1.106×111.112 2 ×1.8＝15054.1(N)
third blade lift:
Y 3 ＝1/2ρC L3 V 2 S＝1/2×1.225×0.965×111.112 2 ×1.8＝13134.9(N)
fourth blade lift:
Y 4 ＝1/2ρC L4 V 2 S＝1/2×1.225×0.976×111.112 2 ×1.8
＝13284.66(N)
lift force of the fifth blade wing:
Y 5 ＝1/2ρC L5 V 2 S＝1/2×1.225×1.013×111.112 2 ×1.8
＝13788.28(N)
sixth blade lift:
Y 6 ＝1/2ρC L6 V 2 S＝1/2×1.225×1.05×111.112 2 ×1.8＝14291.9(N)
total lift force: y ═ Y 1 +Y 2 +Y 3 +Y 4 +Y 5 +Y 6 ＝91063.84(N)
Lift force reduced mass: y ═ Mg (lift ═ mass × coefficient of gravity);
the gravity coefficient g is 9.8 m/s 2 ；
Mass M91063.84/9.8 9292.23 kg 9.29223 ton;
the six horizontal-lift wings 6 thus provide 9.29223 tons of lift in total.
Furthermore, based on the lift wing system scheme in the embodiment, the aerodynamic lift force is utilized to reduce the equivalent weight, and the train wheel-rail friction is reduced, so that the aims of prolonging the service life of the train, reducing the cycle cost and reducing the train operation energy consumption are fulfilled.
Compared with the present embodiment, the mode of arranging the lift wings at the same height in the prior art has an obvious influence on the aerodynamic performance of the rear wing due to the washing of the front wing, the wall surface interference of the carriage, the inter-wing interference and the like, and further causes the serious loss of the lift coefficient of the horizontal lift wing 6, and further the loss of the effective lift.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. An aerodynamic lift collaborative train lift wing system based on high-speed rail clearance constraints is characterized by comprising: a lift wing system; the lifting wing system is arranged at the top of the train (4) and limited below the contact net (2); the same lifting wing system is arranged on each carriage of the train (4); the heights of a plurality of horizontal lifting wings (6) in the lifting wing system are raised from the front end of the carriage to the rear end of the carriage in an equal difference mode.
2. The aerodynamic lift synergistic train lift wing system based on high-speed rail clearance constraints of claim 1, characterized in that: the lifting wing system also comprises a plurality of wing support rods (7); the bottom of the wing support rod (7) is fixedly arranged in the middle of the top surface of the carriage, and the top of the wing support rod (7) is fixedly connected with the middle of the bottom surface of the horizontal lifting wing (6).
3. The aerodynamic lift synergistic train lift wing system based on high-speed rail clearance constraints of claim 1, characterized in that: a horizontal distance (d) between adjacent horizontal lifting wings (6) 1 ) Comprises the following steps: d 1 ＝(L-N*C)/N；
Wherein L is the length of the carriage; n is the number of the horizontal lifting wings; and C is the chord length of the horizontal lift force.
4. The aero-lift cooperative train lift wing system based on high-speed rail clearance constraints of claim 3, wherein: the two horizontal lifting wings (6) positioned at the two ends of the carriage have the nearest distances d from the end part of the carriage 1 /2。
5. The high-speed rail clearance-based constraint of claim 1The aerodynamic lift force cooperated train lift force wing system is characterized in that: a difference in height (d) between adjacent horizontal lift wings (6) 2 ) Is d is 2 ＝(D-H-D 1 )/(N-1)；
Wherein D is the height from the contact net to the top surface of the train; h is the height of the horizontal lifting wing at the front end of the carriage; d 1 The height of the horizontal lifting wing from the overhead line system at the rear end of the carriage is shown.
6. The aeronautic lift coordinated train lift wing system based on high-speed rail boundary constraint of claim 5, wherein: h is more than or equal to 900mm and H is less than or equal to 1100 mm; said D 1 ≥900mm。
7. The aerodynamic lift synergistic train lift wing system based on high-speed rail clearance constraints of claim 1, characterized in that: the aspect ratio of the horizontal lift wing (6) is 5-8, the wing span length is 3000mm-3400mm, and the stall attack angle of the horizontal lift wing (6) is 16-18 degrees.
8. The aero-lift cooperative train lift wing system based on high-speed rail clearance constraints of claim 7, wherein: the attack angle of each horizontal lift wing (6) is independently adjustable, and the adjustment range of the attack angle is 0 degrees to the maximum stall attack angle.
9. The aerodynamic lift synergistic train lift wing system based on high-speed rail clearance constraints of claim 1, characterized in that: the horizontal lift wing (6) is a straight wing designed based on a high-lift wing profile, the relative thickness of the wing profile is 20%, and the maximum camber is positioned at 40% chord length.
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| CN115476887A (en) * | 2022-11-03 | 2022-12-16 | 兰州交通大学 | High-speed train lifting wing |
| CN116882311A (en) * | 2023-06-13 | 2023-10-13 | 兰州交通大学 | Computational fluid dynamics determination method for normalized working attack angle of lift wing of high-speed train |
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