Unlock instant, AI-driven research and patent intelligence for your innovation.

Airplane flap

A flap and aircraft technology, applied in the field of aircraft high lift system, can solve the problems of large aerodynamic loss, large cruising resistance, complex structure, etc., and achieve the effects of small cruising resistance, reduced flap side edge noise, and good noise reduction effect.

Pending Publication Date: 2021-12-31
BEIJING AERONAUTIC SCI & TECH RES INST OF COMAC +1
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides an aircraft flap to solve the problems of large aerodynamic loss, large cruising resistance and complicated structure in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Airplane flap
  • Airplane flap
  • Airplane flap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A specific embodiment of the present invention provides an aircraft flap, figure 1 and figure 2 is a schematic diagram of the outer edge of the flap of this specific embodiment. Since the air passage in the embodiment of the present invention connects the first surface and the second surface, the pressure on the first surface is greater than the pressure on the second surface, and it is known that the pressure on the lower surface of the flap>the pressure on the side surface of the flap>the pressure on the upper surface of the flap, so the pressure of the present embodiment The air passage connects the lower surface and the side surface of the flap or connects the side surface and the upper surface of the flap. There are two air passages in this preferred embodiment, and one air passage connects the upper surface 13 and the side surface 11 of the flap. Form blowing groove 130 on the upper surface 13, promptly connect the second side edge opening of air passage, form s...

Embodiment 2

[0042] A specific embodiment of the present invention provides an aircraft flap, Figure 4 It is a schematic diagram of the outer edge of the flap in this specific embodiment. In this embodiment, there is an air passage connecting the side surface and the lower surface of the flap. The shape of the side edge opening on the side surface and the lower surface is square.

Embodiment 3

[0044] A specific embodiment of the present invention provides an aircraft flap. In this embodiment, there is an air passage, and the air passage connects the high-pressure surface and the low-pressure surface. In this embodiment, the air passage connects the flap lower surface and the side surface The shape of the second side edge opening connecting the side surface of the air passage is a strip shape, and the shape of the first side edge opening on the lower surface is a rectangle. Figure 5 It is a comparison diagram of the geometric shape of the side edge of the common flap and the side edge of the flap of embodiment 3. The flap of embodiment 3 adopts numerical simulation means to carry out noise reduction effect evaluation, Figure 6 It is the root mean square cloud diagram of the pulsating pressure of the common flap side edge and the flap side edge of embodiment 3, Figure 7 is the average pressure distribution nephogram of the common flap side edge and the flap side e...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The utility model discloses an airplane flap, belongs to the field of airplane high lift systems, and is used for reducing side edge noise of the flap and controlling aerodynamic loss at the same time. According to the main technical scheme, the aircraft flap does not comprise an actuating structure for providing air jet, the aircraft flap comprises at least one side edge opening, and the side edge opening is connected with one or more air passages and used for leading in and / or leading out air flow to reduce the strength of a flap side edge vortex system structure. The air passage penetrates through the first surface and the second surface of the flap, a first side edge opening is formed in the first surface, a second side edge opening is formed in the second surface, one of the first surface and the second surface is a side surface of the flap, and one of the first side edge opening and the second side edge opening is a side surface opening. The aircraft flap can reduce pneumatic loss while guaranteeing the noise reduction effect, and is simple in structure and high in practicability.

Description

technical field [0001] The invention relates to the field of aircraft high-lift systems, in particular to an aircraft flap with a noise reduction structure. Background technique [0002] The external noise level of large passenger aircraft is the core index of "environmental protection" and an important evaluation standard for airworthiness certification. The International Civil Aviation Organization's noise airworthiness regulations set out noise control standards for aircraft approach and takeoff. Since December 2017, Europe and the United States have begun to implement the fifth stage of civil aircraft noise airworthiness regulations, requiring the cumulative noise margin to be further reduced by 7EPNdB compared with the fourth stage standard. This provision applies to models that apply for airworthiness certificates after December 31, 2017, and puts forward more stringent requirements for the airworthiness certification of my country's C919 large passenger aircraft and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B64C3/28B64C3/36
CPCB64C3/28B64C3/36Y02T50/10B64C2220/00
Inventor 张颖哲柏宝红林大楷
Owner BEIJING AERONAUTIC SCI & TECH RES INST OF COMAC