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An air beam and airfoil technology, applied in the field of inflatable wings, can solve the problems that the design method of rigid airfoil is difficult to apply, difficult to meet the needs of refined application, serious aeroelastic effect, etc., so as to improve flight economy and flutter performance. Improve and reduce the effect of induced resistance
Pending Publication Date: 2021-11-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
In terms of geometric shape, the traditional strut-type inflatable wing beams are arranged along the span direction, resulting in a corrugated shape in the chord direction, which will cause greater resistance, resulting in a narrow flight envelope, which is difficult to meet the needs of refined applications
At the same time, compared with the traditional rigid wing, the flexible membrane structure of the inflatable wing also causes its aeroelastic effect to be more serious.
Due to the special structural layout of the inflatable wing and the strong nonlinear mechanical behavior of the flexible membrane structure, there is a strong coupling between the structure of the inflatable wing and the discipline of aerodynamics. Further development
Method used
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Embodiment 1
[0071] In this embodiment, based on the design ideas described in the content of the invention, a forward-swept air beam inflatable wing based on a symmetrical airfoil is constructed, and compared with the traditional braided inflatable wing, its geometric parameters and the built model are as follows Table 1 shows.
[0072] Table 1
[0073]
[0074] Among them, the model of the forward-swept air beam inflatable wing based on the symmetrical airfoil NACA0016 is constructed, and the specific implementation steps are as follows: 1. Determine the basic parameters of the inclined-sweep air beam inflatable wing, including the basic airfoil of the inflatable wing, the chord length λ original , spread length L and slope-swept air beam
[0075] Sweep angle θ and chamber spacing x. In this embodiment, the symmetrical airfoil NACA0016 is used as the basic airfoil, and the chord length λ is selected original =405.5mm, length L=802.9mm Rectangular wing is taken as an example, the sl...
Embodiment 2
[0091] In this embodiment, based on the design idea described in the content of the invention, a kind of asymmetrical airfoil based on the swept-swept air beam inflatable wing is constructed, and compared with the traditional braided inflatable wing, its geometric parameters and the built model As shown in Table 4.
[0092] Table 4
[0093]
[0094] Among them, based on the asymmetrical airfoil NACA4418, the model of the swept-swept air beam inflatable wing is established, and the design idea is slightly different from that based on the symmetrical airfoil. The specific steps are as follows.
[0095] 1. Determine the basic parameters of the slanted-swept air beam inflatable wing, including the basic airfoil and chord length λ original , splayed length L and the angle θ of the slanted air beam and the spacing x of the air chamber. In this embodiment, NACA4418 is used as the basic airfoil, and the sweep angle θ of the air spar is swept back at 24°, and the rest of the basic...
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Abstract
The invention relates to an inflatable wing based on oblique-swept gas beams, and can be applied to the field of aircrafts. The method specifically comprises the following steps: determining basic parameters of the oblique-swept gas beam inflatable wing; adjusting the section airfoil of the main oblique-swept gas beam; on the basis of the rounded two-dimensional airfoil profile, obtaining a single three-dimensional main oblique-swept gas beam, constructing a plurality of closely-arranged gas chambers through an array, forming a multi-oblique-swept gas beam structural body, and intercepting a multi-gas-beam entity according to the elongation; making the outer surface skin of the oblique-swept gas beam inflatable wing extracted and constructed through multiple oblique-swept gas beam entities; selecting a projection plane, and bridging an airfoil surface corrugated air chamber intersection line with a projection line on the projection plane to form an inflatable wing internal air chamber brace; and performing curved surface filling according to an airfoil profile end face sideline and an internal brace sideline, and finally forming end faces of two ends of a wingtip and a wingroot of the inflatable wing. The inflatable wing based on oblique-swept gas beams has more ideal lift-drag characteristic and flutter performance, and the aerodynamic performance is obviously improved.
Description
technical field [0001] The invention relates to an air-filled wing based on a slanted-swept air beam, which can be applied to the field of aircraft. Background technique [0002] The inflatable wing is a multi-cavity inflatable structure made of high-strength composite flexible materials, which is filled with high-pressure gas to maintain pressure and shape. Lower cost and other significant advantages. With the refinement of combat requirements and the diversification of aircraft uses, the inflatable wing technology organically combines rigid airframes and flexible wings. The characteristics of rigid-flexible coupling show great application value and have dual-use prospects for military and civilian use. [0003] There are mainly two structural design methods of the inflatable wing, the strut-type inflatable wing and the multi-tracheal inflatable wing. Strap-type inflatable wing means that an inflatable circular tube maintains the external airfoil under the traction constr...
Claims
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Application Information
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