CN107745796B - Backpack type large-scale radome double-leg - Google Patents
Backpack type large-scale radome double-leg Download PDFInfo
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- CN107745796B CN107745796B CN201710816888.XA CN201710816888A CN107745796B CN 107745796 B CN107745796 B CN 107745796B CN 201710816888 A CN201710816888 A CN 201710816888A CN 107745796 B CN107745796 B CN 107745796B
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- leg
- backpack
- supporting leg
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- antenna
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/36—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like adapted to receive antennas or radomes
Abstract
The invention discloses a double-leg shape of a backpack large-scale radome, relates to the leg shape of a backpack large-scale radome of a certain airplane, and belongs to the field of overall aerodynamic shape design. According to the operating requirement of the antenna in the backpack large-scale antenna housing, the support strength and rigidity of the backpack antenna housing are considered, enough space is considered in the supporting leg, the appropriate section shape, the included angle and the height of the supporting leg are designed, the influence of the antenna housing and the double supporting legs on the aerodynamic characteristics of the airplane is reduced, and the airflow separation at the rear part of the supporting leg is effectively inhibited. The airplane test flight verification shows that the two support legs of the backpack large-scale radome meet the use requirement of the antenna in the radome and have excellent aerodynamic characteristics.
Description
Technical Field
The invention belongs to the field of airplane total aerodynamic shape design, and relates to a support leg of a backpack large-scale radome of a certain airplane.
Background
A technical book of technical records discloses the appearance of a backpack large-scale radome landing leg. According to the operation requirement of antenna in the large-scale antenna house of knapsack, consider backpack antenna house and support intensity and rigidity, consider that antenna connecting cable passes through the inside fuselage that reaches of landing leg, the landing leg needs to have sufficient space, adopts the two landing leg forms, designs suitable landing leg section appearance, landing leg contained angle and landing leg height, tries to fly through the aircraft and verifies that this two landing legs of backpack large-scale antenna house satisfy the operation requirement of antenna in the antenna house and possess good aerodynamic characteristics.
The U.S. E-2C, E-3 early warning unit body backpack radome, published in the world handbook of airplanes (aeronautical industry Press, 2001), uses a similar leg form.
Disclosure of Invention
(1) Objects of the invention
On the premise of meeting the use requirement of the antenna, the invention reduces the influence of the additionally-installed large backpack radome and the support legs thereof on the pneumatic characteristics of the whole machine as much as possible, and provides the appearance design of the double support legs of the large backpack radome.
The technical scheme of the invention is that the height of the supporting leg is determined according to the use requirement of the antenna in the antenna housing; considering the support strength and rigidity of the backpack antenna housing, reducing the influence of the support legs on the aerodynamic characteristics of the airplane as much as possible, and determining to adopt a double-support-leg connection form and a double-support-leg included angle; considering that an antenna connecting cable passes through the inside of the supporting leg to reach the body, determining the minimum envelope of the section of the supporting leg according to the volume of the antenna cable, and designing the section of the supporting leg into a wing shape on the basis of the minimum envelope of the section of the supporting leg so as to reduce the airflow separation of the supporting leg and reduce the resistance increment of the supporting leg on the basis of the minimum envelope of the section of the supporting leg. The antenna housing double-leg has enough rigidity and strength, small aerodynamic resistance and good local flow field characteristic on the premise of meeting the use requirement of the antenna. Finally, aircraft test flight verification shows that the antenna housing double support legs meet the use requirements of the antenna in the antenna housing and have excellent aerodynamic characteristics.
(2) Technical scheme
In order to solve the technical problems, the invention is realized by the following technical scheme: the utility model provides a two landing legs of large-scale antenna house of backpack, according to the cable volume of antenna, under the inside enough space prerequisite of assurance landing leg, the distance of roof beam and the thickness of roof beam constitute a rectangle around the landing leg, will wrap up this rectangle with an airfoil. An airfoil profile with the thickness equal to the width of a rectangle is designed, and the airfoil profile is cut into two sections at the position with the maximum thickness, and the two sections are respectively added in front of and behind the rectangle to play a role in rectification.
In order to prevent the airflow between the two wing surfaces from being accelerated seriously, the asymmetric wing profile with the maximum camber of 4 percent, the maximum camber of 40 percent of chord-wise position and the maximum thickness of 21 percent is adopted, the upper surface faces outwards, the lower surface faces inwards, and the curvature of the inner wing surface is relatively gentle. The maximum thickness of the upper surface of the airfoil isThe maximum thickness of the lower surface is
Moving the maximum thickness of both the upper and lower surfaces to
After the positions with the maximum thicknesses of the upper surface and the lower surface are overlapped, the relative thickness is increased to t/c of 21.25%, and all the thickness data are scaled to t/c of 21%. The wing profile is arranged at
Cut into front and rear sections, respectively attached to 1000X 168mm2The front and the back of the rectangular section form the section shape of the supporting leg. To be provided withThe front end point of the supporting leg is a coordinate origin O, the X axis is positive backwards, the Y axis is positive upwards, the supporting leg is selected according to the coordinate points in the following table, and the measurement unit is mm.
All coordinate points are connected into a spline curve and a curved surface is generated to form a landing leg, the landing leg is formed by stretching according to a profile equal percentage line, the profiles of the left landing leg and the right landing leg are the same, the landing legs are symmetrically installed relative to the longitudinal symmetric plane of the airplane, the distance between the lower surface of the radome and the zero longitudinal height H of the airplane body is guaranteed to be 3.35m, and the included angle between the left landing leg and the right landing leg is 19.2 degrees.
(3) Advantageous effects
The invention has the beneficial effects that: according to the shape of the double support legs of the antenna housing, the asymmetric airfoil profile modification improvement with the maximum camber of 4%, the maximum camber of 40% and the maximum thickness of 21% is adopted as the profile shape of the support legs, so that the using requirement of an antenna is met, the influence of the antenna housing and the double support legs on the aerodynamic characteristic of the airplane is reduced, the rear airflow separation of the support legs is effectively inhibited, and the shape of the double support legs of the backpack large antenna housing meets the using requirement of the airplane and the antenna through flight test verification.
Drawings
FIG. 1 is a cross-sectional profile view of a double-leg of a backpack type large radome;
FIG. 2 is a schematic view of the installation of a backpack large radome with two legs;
the large-scale antenna housing comprises a body 1, a large backpack antenna housing 2 and 3, and is characterized in that the body 2 is a double-leg structure, the large backpack antenna housing 3 is a large backpack antenna housing, and the included angle formed by the left leg and the right leg is 4.
Detailed description of the invention
The utility model provides a two landing legs of large-scale antenna house of backpack, according to the cable volume of antenna, under the inside enough space prerequisite of assurance landing leg, the distance of roof beam and the thickness of roof beam constitute a rectangle around the landing leg, will wrap up this rectangle with an airfoil. An airfoil profile with the thickness equal to the width of a rectangle is designed, and the airfoil profile is cut into two sections at the position with the maximum thickness, and the two sections are respectively added in front of and behind the rectangle to play a role in rectification.
The maximum camber of 4 percent is shifted to the maximum thickness of the upper surface and the lower surface of the asymmetric airfoil with the maximum camber positioned at the chordwise position of 40 percent and the maximum thickness of 21 percent
After the maximum thickness positions of the upper surface and the lower surface are overlapped, the relative thickness is thickened to t/c which is 21.25 percent, and all the thickness data are scaled to t/c which is 21 percent. The wing profile is arranged at
Cut into front and rear sections, respectively attached to 1000X 168mm2The front and the back of the rectangular section form the section shape of the supporting leg. The front end point of the supporting leg is taken as the origin of coordinates O, the X axis is positive backwards, the Y axis is positive upwards, the measurement unit is mm, and the measurement unit is selected according to the coordinate points in the following table.
Connecting all coordinate points into a spline curve and generating a curved surface to form a profile appearance of the landing leg, stretching according to profile equal percentage lines to form the landing leg, wherein the profiles of the left landing leg and the right landing leg are the same, and the left landing leg and the right landing leg are symmetrically installed relative to the longitudinal symmetric plane of the airplane, so that the distance between the lower surface of the radome and the zero longitudinal height H on the airplane body is 3.35m, and the included angle formed by the left landing leg and the right landing leg is 19..
Claims (3)
1. The utility model provides a two landing legs of large-scale antenna house of backpack which characterized in that: the cable volume of the antenna housing is that under the premise of ensuring enough space in the supporting leg, the distance between the front beam and the rear beam of the supporting leg and the thickness of the beams form a rectangle, and the rectangle is wrapped by an airfoil; designing an airfoil with a thickness corresponding to the width of a rectangleCutting the plate into two sections at the position with the maximum thickness, and respectively adding the two sections in front of and behind the rectangle to play a role in rectification; adopting an asymmetric airfoil profile with the maximum camber of 4 percent, the maximum camber of 40 percent at the chord-wise position and the maximum thickness of 21 percent, wherein the upper surface faces outwards, the lower surface faces inwards, and the curvature of the inner airfoil surface is relatively gentle; the maximum thickness of the upper surface of the airfoil is
The maximum thickness of the lower surface isMoving the maximum thickness of both the upper and lower surfaces to
Thus, after the maximum thickness positions of the upper surface and the lower surface are overlapped, the relative thickness is thickened to t/c which is 21.25%, and all thickness data are scaled to t/c which is 21%; the wing profile is arranged atCut into front and rear sections, respectively attached to 1000X 168mm2The front and the back of the rectangular section form the section shape of the supporting leg; selecting the front end point of the support leg as a coordinate origin O, the backward direction of an X axis as a positive direction, the upward direction of a Y axis as a positive direction according to the coordinate points in the following table, wherein the measurement unit is mm;
and connecting all coordinate points into a spline curve and generating a curved surface to form the support leg.
2. The backpack large radome double-leg according to claim 1, wherein: the shape of the antenna housing double-leg is stretched according to the equal percentage line of the section to form the legs, the sections of the left leg and the right leg are the same, and the left leg and the right leg are symmetrically installed relative to the longitudinal symmetric plane of the airplane.
3. The backpack large radome double-leg according to claim 1, wherein: the distance between the lower surface of the antenna housing and the zero longitudinal height H on the machine body is 3.35m, and the included angle between the left supporting leg and the right supporting leg is 19.2 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710816888.XA CN107745796B (en) | 2017-09-12 | 2017-09-12 | Backpack type large-scale radome double-leg |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710816888.XA CN107745796B (en) | 2017-09-12 | 2017-09-12 | Backpack type large-scale radome double-leg |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107745796A CN107745796A (en) | 2018-03-02 |
| CN107745796B true CN107745796B (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710816888.XA Active CN107745796B (en) | 2017-09-12 | 2017-09-12 | Backpack type large-scale radome double-leg |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109484620B (en) * | 2018-03-16 | 2022-05-13 | 陕西飞机工业（集团）有限公司 | Overlapped disc radome on back of body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201077530Y (en) * | 2007-08-02 | 2008-06-25 | 叶万章 | Vertically taking off and landing energy-saving pre-warning device |
| CN103221304A (en) * | 2010-05-17 | 2013-07-24 | 码科泰克公司 | Radome |
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Address after: 723213 Liulin Town, Chenggu County, Hanzhong City, Shaanxi Province Patentee after: Shaanxi Aircraft Industry Co., Ltd Address before: 723213 P.O. Box 34, Hanzhong, Shaanxi Patentee before: Shaanxi aircraft industry (Group) Co., Ltd |
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