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Method for reducing wing shock wave resistance through zero-mass-flux jet

A technology of shock wave resistance and zero mass, which is applied in the field of aircraft wings, can solve the problems of poor drag reduction effect and affecting the aerodynamic performance of wings, and achieve the effects of weakening shock wave intensity, good robustness, and rich control effect

Active Publication Date: 2015-07-08
XIAMEN UNIV
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Problems solved by technology

However, the solid bulge drag reduction technology is a passive flow control method. This method has a better effect of reducing shock wave resistance in the design state, but the dra

Method used

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  • Method for reducing wing shock wave resistance through zero-mass-flux jet
  • Method for reducing wing shock wave resistance through zero-mass-flux jet
  • Method for reducing wing shock wave resistance through zero-mass-flux jet

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[0022] In the present invention, taking a typical supercritical wing as an example, the specific steps of using zero-mass jet to reduce shock wave resistance are as follows:

[0023] Step 1: Choose a zero-mass jet exciter; the average velocity of the jet generated by the exciter is 5~250m / s, and the excitation frequency, output waveform, and outlet momentum coefficient are adjustable; the zero-mass jet exciter can be piezoelectric film or Piston type zero mass jet exciter. When the zero-mass jet exciter works, the reciprocating motion of the diaphragm or piston in the cavity generates a vortex pair, forming a momentum jet, such as figure 1 Shown. When the zero-mass jet interacts with the horizontal main flow, the streamline along the object surface will move outwards, forming a virtual aerodynamic bulge surface, such as figure 2 Shown.

[0024] Step 2: Arrange multiple zero-mass jet exciters at equal intervals on the upper surface of the airfoil at 40% to 80% chord length, such a...

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Abstract

The invention provides a method for reducing wing shock wave resistance through zero-mass-flux jet, and relates to airplane wings. The method for reducing wing shock wave resistance through the zero-mass-flux jet is provided, a virtual pneumatic bump profile is generated through the zero-mass-flux jet, so that the virtual pneumatic bump profile is produced through the zero-mass-flux jet and can achieve the shock wave resistance reducing effect the same as that of a real bump. Zero-mass-flux jet exciters are selected, used and distributed at the positions, with 40-80% of chord length, of the upper surface of an airfoil profile at an equal interval. A database including airfoil profile surface shock wave positions under different flying states, zero-mass-flux jet outlet momentum coefficients using the zero-mass-flux jet exciters to reduce resistance, frequency and other parameters is built. The zero-mass-flux jet exciter which is close to one side of the front edge of the airfoil profile and is nearest to the shock wave initial position on the surface of the airfoil profile is determined. According to the relation between the exciter and the shock wave initial position, the zero-mass-flux jet exciters needing to be started and the outlet momentum coefficients, the frequency and other parameters of the zero-mass-flux jet are determined, and the effect of reducing shock wave resistance is achieved.

Description

technical field [0001] The invention relates to aircraft wings, in particular to a method for reducing wing shock wave resistance by using zero-mass jet flow. Background technique [0002] The drag reduction technology of civil aviation airliners has always been a hot issue studied by scholars from all over the world. Studies have shown that for large civil aviation airliners, when the resistance is reduced by 1%, the direct use cost can be reduced by 0.2% (Li Peifeng, Zhang Binqian, Chen Yingchun, etc. Bulge flow control technology to reduce airfoil shock resistance[J ].Acta Aeronautics, 2011,32(6):971-977; Reneaux J.Overview on drag reduction technologies for civil transport aircraft[J].ONERA:Tire a Part,2004,153:1-18.Transportation Systems,pp .81-86, ISSN: ISSN 1349-113X, 2006). Modern civil aviation airliners generally adopt supercritical wing technology, which can greatly improve the lift-to-drag ratio and cruise Mach number of the aircraft (Harris C D.NASA Supercriti...

Claims

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Application Information

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IPC IPC(8): B64C1/38
Inventor 陈荣钱王旭尤延铖朱呈祥
Owner XIAMEN UNIV
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