CN106994978A - A kind of ultrahigh speed pipeline train shape of low aerodynamic drag - Google Patents
A kind of ultrahigh speed pipeline train shape of low aerodynamic drag Download PDFInfo
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- CN106994978A CN106994978A CN201710295856.XA CN201710295856A CN106994978A CN 106994978 A CN106994978 A CN 106994978A CN 201710295856 A CN201710295856 A CN 201710295856A CN 106994978 A CN106994978 A CN 106994978A
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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 a kind of ultrahigh speed pipeline train shape of low aerodynamic drag, the car body profile is tip fine stern profile, and smoothly transitted using SPL with car body, car body section is special geometric figure, the present invention can have the aerodynamic configuration of smoothness simultaneously on the basis of larger body volume, and can significantly reduce the air drag during train is run at high speed.
Description
Technical Field
The invention relates to the technical field of high-speed train aerodynamic configuration, in particular to a low aerodynamic resistance ultrahigh-speed pipeline train configuration aerodynamic layout.
Background
In the aerodynamic shape design of a high-speed train, the reduction of the aerodynamic resistance of the train is very critical to the shape design of the high-speed train, and in order to enable an aircraft to have excellent air resistance performance, the shapes of a cross section of a train body, a head of the train body, a middle section of the train body and a tail section of the train body are very important.
At present, foreign high-speed trains mostly adopt smooth heads with certain bluntness to reduce air resistance, for example: the train CRH5 is a Chinese high-speed train which can effectively reduce the aerodynamic resistance of the train, but when the speed of the train is further improved, the aerodynamic performance is poor.
Disclosure of Invention
In view of the above, the invention provides a low aerodynamic resistance ultrahigh speed pipeline train shape, which greatly reduces the air resistance of the train in the high speed running process, and has a smooth aerodynamic shape and a higher train body volume.
The appearance of the ultra-high-speed pipeline train with low aerodynamic resistance consists of the appearance of a first section of a train body, the appearance of a middle section of the train body and the appearance of a tail section of the train body;
the shape of the first section of the vehicle body and the shape of the tail section of the vehicle body except the top point are respectively bilaterally symmetrical gradually-changed geometric profiles, the shape of the middle section of the vehicle body is respectively bilaterally symmetrical geometric profile, the geometric profile of the first section of the vehicle body is formed by six curves, and the geometric profiles of the middle section of the vehicle body and the tail section of the vehicle body are formed by five curves;
the contour of the cross section of the middle section of the vehicle body is provided with five points which are respectively a vertex, 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, spline curve sections are arranged between the vertex and the point on the left side of the vehicle body and are in an outward convex shape, the spline curve sections are also arranged between the vertex and the point on the right side of the vehicle body, the 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, the spline curve sections and the straight; 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;
determining a middle point on a straight line section at the bottom of the vehicle body, wherein the cross section of the middle section of the vehicle body is axisymmetric along the direction of a connecting line 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 contour as a starting point to a head sharp point A, the curvature is gradually reduced towards the direction of the vehicle head, the six buses are converged to the head sharp point A, 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;
a bus in 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 ranges from 8 to 20; wherein,d is the equivalent diameter of the cross section of the middle section of the vehicle body;
the bus direction of the tail section of the vehicle body is to make a smooth spline curve from five points on the contour as starting points to a tail E point, the five buses are converged to a tail sharp point E point, and an included angle between the E point and a horizontal straight line is 10-40 degrees;
the train shape is formed by sweeping the cross section of the middle section of the train body along the direction of each section of the bus respectively, and the first section of the train body, the middle section of the train body and the tail section of the train body are in smooth transition.
Furthermore, a bus of the tail section of the vehicle body is a smooth spline curve with the curvature changing from decreasing, increasing, decreasing and increasing towards the tail direction.
Furthermore, the smooth spline curve of the tail section of the vehicle body comprises an outward convex curve and an inward concave curve, and the outward convex curve and the inward concave curve are in smooth transition and extend towards the tail direction.
Further, the point A of the head tip is rounded, and the radius of the rounding is between 10mm and 200 mm.
Furthermore, the tail sharp point E is rounded, and the radius of the rounding is between 20mm and 400 mm.
Further, the lengths of the first 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 reference.
Has the advantages that:
1. the train body is in a sharp-pointed and sharp-tail shape, the spline curve is smoothly transited with the train body, the section of the train body is in a special geometric figure, the smooth aerodynamic shape can be realized on the basis of larger 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 vehicle body comprises an outward convex curve and an inward concave curve, the outward convex curve and the inward concave curve are in smooth transition and extend towards the tail direction of the vehicle, and the purpose is to ensure large volume capacity under the condition of meeting the requirement of reducing resistance.
Drawings
FIG. 1 is a side view of the aerodynamic configuration of the body contour of the present invention;
FIG. 2 is a top view of the aerodynamic configuration of the body contour of the present invention;
FIG. 3 is a bottom view of the aerodynamic configuration of the body contour of the present invention;
FIG. 4 is a schematic cross-sectional view of a middle section of the vehicle body according to the present invention;
FIG. 5 is a front elevational view of the vehicle body head of the present invention;
fig. 6 is a rear view of the vehicle body tail of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
This embodiment provides a low aerodynamic drag ultra high speed pipe train profile as shown in figure 1. The train is divided into a train body first section, a train body middle section and a train body tail section.
The cross sections of the first section, the middle section and the tail section are plane geometric figures which are symmetrical left and right, the profile of the cross section of the first section is composed of six curves, and the profiles of the cross sections of the middle section and the 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 cross section profile of the middle section of the vehicle body, which are respectively 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, a spline curve section is arranged between the vertex B and the point D1 on the left side of the vehicle body, the spline curve section is convex, a spline curve section is also arranged between the vertex B and the point D2 on the right side of the vehicle body, the two spline curves are tangent to the top of the vehicle body, a straight line section, namely C1C2, is arranged between the two points on the bottom of the vehicle body, an arc section is adopted between the spline curve section BD1 and the straight line section C1C2, an arc section is adopted between the spline curve section BD2 and the straight line; the lengths of the spline curve sections BD1 and BD2 are 0.5-1D, the radiuses of the arc sections D1C1 and D2C2 are 0.01-0.25D, D is the equivalent diameter of the cross section of the middle section of the vehicle body, the equivalent diameter of the non-circular tube is the diameter of a circular tube with the same hydraulic radius, and the angle range of the arc is 30-90 degrees.
As shown in fig. 5, the midpoint of a straight line segment C1C2 is a point C, the cross section is axisymmetric along BC, six smooth spline curves are made from six points B, D1, C1, C, C2 and D2 on the contour as starting points to a head cusp point a in the bus direction of the first segment of the vehicle body, the curvature is gradually reduced towards the vehicle head direction, the six buses BA, D1A, C1A, CA, C2A and D2A converge to the head cusp point a, 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; the point A of the head tip is rounded, and the radius of the rounding is between 10mm and 200 mm.
A bus in 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 ranges from 8 to 20; wherein,
as shown in fig. 6, the generatrix direction of the tail section of the vehicle body is a smooth spline curve from five points F, H2, G2, G1 and H1 on the outline as starting points to a tail point E, the curvature changes from decreasing, increasing, decreasing and increasing in the tail direction, the five generatrixes FE, H2E, G2E, G1E and H1E converge to a tail sharp point E, the included angle between the E point and a horizontal straight line is 10-40 degrees, the E point at the tail is rounded, and the radius of the rounding is 20-400 mm. The smooth spline curves FE, H2E, G2E, G1E and H1E all comprise an outer convex curve and an inner concave curve, and the outer convex curve and the inner concave curve are in smooth transition and extend towards the tail direction of the vehicle.
The train appearance is formed by sweeping the cross section of automobile body middle section along each section generating line direction respectively, the appearance of automobile body first section is formed by sweeping the cross section of automobile body middle section along curve BA, D1A, C1A, CA, C2A, D2A, the appearance of automobile body middle section is formed by sweeping the cross section of automobile body middle section along the straightway that is parallel with automobile body length direction, the appearance of automobile body tail section is formed by sweeping the cross section of automobile body middle section along curve FE, H2E, G2E, G1E, H1E, and automobile body first section, automobile body middle section and automobile body tail section smooth transition.
The lengths of the first 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 reference. Length L of the head12D to 6D, length L of vehicle body28D-20D, length L of vehicle tail3＝2D～6D。
The vehicle body is in a pointed tail shape, a spline curve and the vehicle body are in smooth transition, the cross section of the vehicle body is in a special geometric figure, and airflow can smoothly pass through the vehicle body on the basis of a large machine body volume, so that the airflow resistance is reduced. The numerical simulation verifies that the low aerodynamic resistance ultra-high speed pipeline train appearance aerodynamic layout provided by the invention is compared with the appearance of a domestic CRH5 high speed train, the zero resistance coefficient of a train body is reduced by 30 percent (the reference area is the cross section area of the train body), and the appearance design target of low aerodynamic resistance is realized.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The appearance of the ultra-high-speed pipeline train with low aerodynamic resistance is characterized in that the appearance of the train consists of the appearance of a first section of a train body, the appearance of a middle section of the train body and the appearance of a tail section of the train body;
the shape of the first section of the vehicle body and the shape of the tail section of the vehicle body except the top point are respectively bilaterally symmetrical gradually-changed geometric profiles, the shape of the middle section of the vehicle body is respectively bilaterally symmetrical geometric profile, the geometric profile of the first section of the vehicle body is formed by six curves, and the geometric profiles of the middle section of the vehicle body and the tail section of the vehicle body are formed by five curves;
the contour of the cross section of the middle section of the vehicle body is provided with five points which are respectively a vertex, 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, spline curve sections are arranged between the vertex and the point on the left side of the vehicle body and are in an outward convex shape, the spline curve sections are also arranged between the vertex and the point on the right side of the vehicle body, the 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, the spline curve sections and the straight; 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;
determining a middle point on a straight line section at the bottom of the vehicle body, wherein the cross section of the middle section of the vehicle body is axisymmetric along the direction of a connecting line 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 contour as a starting point to a head sharp point A, the curvature is gradually reduced towards the direction of the vehicle head, the six buses are converged to the head sharp point A, 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;
a bus in 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 ranges from 8 to 20; wherein,
the bus direction of the tail section of the vehicle body is to make a smooth spline curve from five points on the contour as starting points to a tail E point, the five buses are converged to a tail sharp point E point, and an included angle between the E point and a horizontal straight line is 10-40 degrees;
the train shape is formed by sweeping the cross section of the middle section of the train body along the direction of each section of the bus respectively, and the first section of the train body, the middle section of the train body and the tail section of the train body are in smooth transition.
2. A low aerodynamic drag, ultra high speed pipe train profile as claimed in claim 1 wherein the generatrix of said tail section of said body is a smooth spline curve with a varying decrease-increase-decrease-increase curvature in the aft direction.
3. The low aerodynamic drag ultra high speed tube train configuration of claim 1, wherein said smooth spline curve of the tail section of the train body comprises a convex curve and a concave curve, the convex curve smoothly transitions with the concave curve and extends in the direction of the rear of the train.
4. A low aerodynamic drag super high speed pipe train profile as claimed in claim 1, wherein the rounding is at the head nose point a with a radius of between 10mm and 200 mm.
5. A low aerodynamic drag super high speed pipe train profile as claimed in claim 1, wherein the blend radius is between 20mm and 400mm at the end tip point E.
6. A low aerodynamic resistance ultra high speed tube train configuration as claimed in claim 1, wherein the lengths of the body first section, the body middle section and the body end section are designed based on the body middle section cross sectional equivalent diameter D.
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| CN201710295856.XA CN106994978B (en) | 2017-04-28 | 2017-04-28 | Ultra-high speed pipeline train appearance structure of low aerodynamic resistance |
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| CN201710295856.XA CN106994978B (en) | 2017-04-28 | 2017-04-28 | Ultra-high speed pipeline train appearance structure of low aerodynamic resistance |
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Cited By (2)
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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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