CN106994978B - Ultra-high speed pipeline train appearance structure of low aerodynamic resistance - Google Patents
Ultra-high speed pipeline train appearance structure of low aerodynamic resistance Download PDFInfo
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- CN106994978B CN106994978B CN201710295856.XA CN201710295856A CN106994978B CN 106994978 B CN106994978 B CN 106994978B CN 201710295856 A CN201710295856 A CN 201710295856A CN 106994978 B CN106994978 B CN 106994978B
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Classifications
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention discloses an ultra-high speed pipeline train appearance structure with low aerodynamic resistance, wherein the train body appearance is a pointed-end tail appearance, spline curves are adopted to smoothly transition with the train body, and the section of the train body is a special geometric figure.
Description
Technical Field
The invention relates to the technical field of pneumatic appearance of high-speed trains, in particular to pneumatic layout of an appearance of an ultra-high-speed pipeline train with low pneumatic resistance.
Background
In the aerodynamic profile design of a high-speed train, reducing the aerodynamic drag of the train is critical to the profile design of the high-speed train, and in order to make an aircraft have excellent aerodynamic drag performance, the profiles of a vehicle body cross section, a vehicle body head, a vehicle body middle section and a vehicle body tail section are very important.
Currently, most foreign high-speed trains adopt smooth heads with certain bluntness so as to reduce air resistance, for example: the Chinese high-speed rail train CRH5 can effectively reduce the aerodynamic resistance of the train, but when the train speed is further improved, the aerodynamic performance is poor.
Disclosure of Invention
In view of the above, the present invention provides an ultra-high speed pipeline train profile structure with low aerodynamic resistance, which greatly reduces the aerodynamic resistance of the train during high speed driving, and has a smooth aerodynamic profile and a high body volume.
The train appearance structure of the ultra-high speed pipeline with low aerodynamic resistance comprises an appearance of a train body head section, an appearance of a train body middle section and an appearance of a train body tail section;
the geometric outline of the first section of the vehicle body and the geometric outline of the tail section of the vehicle body are all symmetrical gradually-changed geometric outlines, wherein any cross section of the outline of the middle section of the vehicle body is symmetrical left and right, the geometric outline of the first section of the vehicle body is composed of six curves, and the geometric outlines of the middle section of the vehicle body and the tail section of the vehicle body are composed of five curves;
five points are arranged on the profile of the cross section of the middle section of the vehicle body, namely a top point, a point on the left side of the vehicle body, a point on the right side of the vehicle body and two points on the bottom of the vehicle body, wherein a spline curve section is arranged between the top point and the point on the left side of the vehicle body and is convex, a spline curve section is also arranged between the top point and the point on the right side of the vehicle body, two spline curves are tangent at the top of the vehicle body, a straight line section is arranged between the two points on the bottom of the vehicle body, an arc section is adopted for transition between the spline curve section and the straight line section, and the arc section is tangent with the spline curve section and the straight line section respectively; the length of the spline curve section is 0.5-1D, the radius of the arc section is 0.01-0.25D, D is the equivalent diameter of the cross section of the middle section of the vehicle body, and the angle range of the arc is 30-90 degrees;
a middle point is determined on a straight line section at the bottom of the vehicle body, the cross section of the middle section of the vehicle body is axisymmetric along the connecting line direction from the top point to the middle point, the bus direction of the first section of the vehicle body is a smooth spline curve from six points on the profile as starting points to a point A at the head, the curvature gradually decreases towards the direction of the vehicle head, the six buses are converged to the point A at the head, and the vertical height from the point A to the top of the vehicle body is larger than the vertical height from the point A to the bottom of the vehicle body;
the bus of the middle section of the vehicle body is a straight line section parallel to the length direction of the vehicle body, and the ratio of the length of the straight line section to the equivalent diameter D is 8-20; wherein,d is the equivalent diameter of the cross section of the middle section of the vehicle body;
the direction of a bus of the tail section of the car body is a smooth spline curve from five points on the contour to a tail point E, the five buses are converged to a tail point E, and the included angle between the E and a horizontal straight line is 10-40 degrees;
the train appearance is formed by scanning the cross section of the train body middle section along the bus direction of each section respectively, and the train body first section, the train body middle section and the train body tail section are in smooth transition.
Further, the bus of the tail section of the vehicle body is a smooth spline curve with curvature changing from decreasing to increasing to decreasing to increasing.
Further, the smooth spline curve of the tail section of the vehicle body comprises a convex curve and a concave curve, and the convex curve and the concave curve are in smooth transition and extend towards the tail direction.
Further, the head point A is rounded, and the radius of the rounding is between 10mm and 200 mm.
Further, the tail point E is rounded, and the radius of the rounding is 20 mm-400 mm.
Further, the lengths of the head section, the middle section and the tail section are designed based on the equivalent diameter D of the cross section of the middle section.
The beneficial effects are that:
1. the train body is in a pointed-end shape, a spline curve is adopted to smoothly transition with the train body, the section of the train body is in a special geometric figure, the train body has a smooth pneumatic shape on the basis of a large body volume, and the air resistance of the train in the high-speed running process can be greatly reduced.
2. The bus of the tail section of the automobile body comprises a convex curve and a concave curve, and the convex curve and the concave curve are in smooth transition and extend towards the tail direction, so that the purpose of ensuring large volume under the condition of meeting the requirement of reducing resistance is achieved.
Drawings
FIG. 1 is a side view of the aerodynamic layout of the body profile of the present invention;
FIG. 2 is a top plan view of the aerodynamic layout of the body profile of the present invention;
FIG. 3 is a bottom view of the aerodynamic layout of the body profile of the present invention;
FIG. 4 is a schematic cross-sectional view of a mid-section of the vehicle body of the present invention;
FIG. 5 is a front view of the head of the vehicle body of the present invention;
fig. 6 is a rear view of the rear end of the vehicle body of the present invention.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The embodiment provides an appearance structure of a super-high-speed pipeline train with low aerodynamic resistance, as shown in fig. 1. The train appearance is divided into a train body head section, a train body middle section and a train body tail section.
Any cross sections of the vehicle body head section, the vehicle body middle section and the vehicle body tail section are plane geometric figures which are bilaterally symmetrical, the profile of the cross section of the vehicle body head section is composed of six curves, and the profile of the cross section of the vehicle body middle section and the profile of the cross section of the vehicle body tail section are composed of five curves, as shown in fig. 2 and 3.
As shown in fig. 4, five points are arranged on the contour of the cross section of the middle section of the vehicle body, namely a vertex B, a point D1 on the left side of the vehicle body, a point D2 on the right side of the vehicle body and two points C1 and C2 on the bottom of the vehicle body, spline curve segments are arranged between the vertex B and the point D1 on the left side of the vehicle body and are convex, spline curve segments are also arranged between the vertex B and the point D2 on the right side of the vehicle body, two spline curves are tangent at the top of the vehicle body, a straight line segment, namely C1C2, is arranged between the two points on the bottom of the vehicle body, the spline curve segments BD1 and the straight line segment C1C2 are in arc segment transition, and arc segments D1C1 and D2C2 are respectively tangent with the spline curve segments; the lengths of spline curve segments BD1 and BD2 are 0.5-1D, the radii of arc segments D1C1 and D2C2 are 0.01-0.25D, D is the equivalent diameter of the cross section of the middle section of the automobile body, the equivalent diameter of a non-circular pipe is the diameter of a circular pipe with equal hydraulic radius, and the angle range of the arc is 30-90 degrees.
As shown in fig. 5, the midpoint of the straight line segment C1C2 is point C, the cross section is axisymmetric along BC, the bus direction of the first segment of the vehicle body is six smooth spline curves from six points B, D1, C1, C, C, D2 on the outline to the point a of the head, the curvature gradually decreases toward the direction of the vehicle head, the six buses BA, D1A, C1A, CA, C2A, D a converge to the point a of the head, and the vertical height from the point a to the top of the vehicle body is greater than the vertical height from the point a to the bottom of the vehicle body; and the point A of the head is rounded, and the radius of the rounding is between 10mm and 200 mm.
The bus of the middle section of the vehicle body is a straight line section parallel to the length direction of the vehicle body, and the ratio of the length of the straight line section to the equivalent diameter D is 8-20; wherein,
as shown in fig. 6, the bus direction of the tail section of the vehicle body is a smooth spline curve from five points F, H, G2, G1 and H1 on the outline to a tail point E, the curvature is a decrease-increase-decrease-increase change in the tail direction, the five bus lines FE and H2E, G2E, G1E, H E converge to a tail point E, the included angle between the E point and a horizontal straight line is 10-40 degrees, the tail point E is rounded, and the radius of the rounding is 20-400 mm. The smooth spline curves FE, H2E, G2E, G1E, H1E each comprise a convex curve and a concave curve, which smoothly transition and extend toward the tail.
The train appearance is formed by the cross section of automobile body middle section is swept along each section generating line direction respectively, and the appearance of automobile body first section is swept along curve BA, D1A, C A, CA, C2A, D A by the cross section of automobile body middle section and is formed, and the appearance of automobile body middle section is swept along the straightway that is parallel with automobile body length direction by the cross section of automobile body middle section, and the appearance of automobile body tail section is swept along curve FE, H2E, G2E, G1E, H1E by the cross section of automobile body middle section, and automobile body first section, automobile body middle section and automobile body tail section smooth transition.
The lengths of the head section, the middle section and the tail section of the vehicle body are designed by taking the equivalent diameter D of the cross section of the middle section of the vehicle body as a standard. Length L of the headstock 1 Length of vehicle body l=2d to 6D 2 Length of tail l=8d to 20D 3 ＝2D～6D。
The vehicle body is in a pointed-end shape, a spline curve is adopted to smoothly transition with the vehicle body, the cross section of the vehicle body is in a special geometric figure, and air flow smoothly passes through the vehicle body on the basis of a large body volume, so that air flow resistance is reduced. Through numerical simulation verification, the appearance pneumatic layout of the ultra-high speed pipeline train with low aerodynamic resistance provided by the invention is relatively to the appearance of a domestic CRH5 high speed train, the zero resistance coefficient of the train body is reduced by 30% (the reference area is the cross section area of the train body), and the appearance design target with low aerodynamic resistance is realized.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The train appearance structure of the ultra-high speed pipeline with low aerodynamic resistance is characterized by comprising a train body head section, a train body middle section and a train body tail section, wherein the train appearance consists of the train body head section appearance, the train body middle section appearance and the train body tail section appearance;
the geometric outline of the first section of the vehicle body and the geometric outline of the tail section of the vehicle body are all symmetrical gradually-changed geometric outlines, wherein any cross section of the outline of the middle section of the vehicle body is symmetrical left and right, the geometric outline of the first section of the vehicle body is composed of six curves, and the geometric outlines of the middle section of the vehicle body and the tail section of the vehicle body are composed of five curves;
five points are arranged on the profile of the cross section of the middle section of the vehicle body, namely a top point, a point on the left side of the vehicle body, a point on the right side of the vehicle body and two points on the bottom of the vehicle body, wherein a spline curve section is arranged between the top point and the point on the left side of the vehicle body and is convex, a spline curve section is also arranged between the top point and the point on the right side of the vehicle body, two spline curves are tangent at the top of the vehicle body, a straight line section is arranged between the two points on the bottom of the vehicle body, an arc section is adopted for transition between the spline curve section and the straight line section, and the arc section is tangent with the spline curve section and the straight line section respectively; the length of the spline curve section is 0.5-1D, the radius of the arc section is 0.01-0.25D, D is the equivalent diameter of the cross section of the middle section of the vehicle body, and the angle range of the arc is 30-90 degrees;
a middle point is determined on a straight line section at the bottom of the vehicle body, the cross section of the middle section of the vehicle body is axisymmetric along the connecting line direction from the top point to the middle point, the bus direction of the first section of the vehicle body is a smooth spline curve from six points on the profile as starting points to a point A at the head, the curvature gradually decreases towards the direction of the vehicle head, the six buses are converged to the point A at the head, and the vertical height from the point A to the top of the vehicle body is larger than the vertical height from the point A to the bottom of the vehicle body;
the bus of the middle section of the vehicle body is a straight line section parallel to the length direction of the vehicle body, and the ratio of the length of the straight line section to the equivalent diameter D is 8-20; wherein,
the direction of a bus of the tail section of the car body is a smooth spline curve from five points on the contour to a tail point E, the five buses are converged to a tail point E, and the included angle between the E and a horizontal straight line is 10-40 degrees;
the train appearance is formed by sweeping the cross section of the middle section of the train body along the bus direction of each section, and the first section, the middle section and the tail section of the train body are in smooth transition;
the bus of the tail section of the vehicle body is a smooth spline curve with curvature in the direction of the vehicle tail being changed from reduction to increase to reduction to increase; the smooth spline curve of the tail section of the vehicle body comprises a convex curve and a concave curve, and the convex curve and the concave curve are in smooth transition and extend towards the tail direction.
2. The ultra-high speed pipeline train profile structure with low aerodynamic resistance according to claim 1, wherein the point a of the head is rounded with a radius of 10 mm-200 mm.
3. The low aerodynamic drag ultra-high speed pipeline train profile structure of claim 1, wherein the radius of the radius is between 20mm and 400mm, with the point E being rounded at the tail point.
4. The low aerodynamic drag ultra-high speed pipeline train configuration of claim 1, wherein the lengths of the body first section, the body midsection and the body tail section are designed based on the body midsection cross-sectional equivalent diameter D.
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| CN108717489A (en) * | 2018-05-17 | 2018-10-30 | 中南大学 | A kind of high-speed train head geometry parameterization method |
| CN109278766A (en) * | 2018-09-19 | 2019-01-29 | 同济大学 | A kind of new High speed wheel rail train system |
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