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A Dune Imitation Microstructure with Efficient Air Drag Reduction Function and Its Optimal Design Method

A high-efficiency air and optimized design technology, applied in the field of surface drag reduction, can solve problems such as poor air drag reduction effect and large wind resistance on the smooth surface of aircraft, so as to achieve efficient design methods, good pertinence and flexibility, and alleviate excessive energy consumption. high effect

Active Publication Date: 2020-05-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a design method of imitating sand dune microstructure with efficient air drag reduction function, to reduce the energy consumption of the aircraft during service, save fuel resources, and solve the problem of excessive wind resistance on the smooth surface of the aircraft during service. question
[0006] Aiming at the problem that the air drag reduction effect of the existing bionic microstructure is not good, the present invention provides a new design method of dune imitation microstructure with high-efficiency air drag reduction function, the steps are as follows:

Method used

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  • A Dune Imitation Microstructure with Efficient Air Drag Reduction Function and Its Optimal Design Method
  • A Dune Imitation Microstructure with Efficient Air Drag Reduction Function and Its Optimal Design Method
  • A Dune Imitation Microstructure with Efficient Air Drag Reduction Function and Its Optimal Design Method

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Embodiment 1

[0034] The design method of the dune-like microstructure with high-efficiency air drag reduction function of the present invention is as follows:

[0035] In the first step, a geometric model of the flow field with an area size of 15mm×15mm×45mm is established. A buffer zone of 15mm length is set in the front and back sections of the flow field area, and 15mm is reserved in the middle area to arrange the microstructure array.

[0036] The second step is to establish a geometric model of the dune-like microstructure. The height H is set to 40μm, the length L is set to 200μm, and the first arc center is O 1 Located at the left end of the microstructure bottom surface and perpendicular to the vertical line of the bottom surface, corresponding to the central angle θ 1 Set to 25°, the second arc circle center O 2 Located at the highest point of the microstructure and perpendicular to the vertical line of the bottom surface, corresponding to the central angle θ 2 Set to 30°, the third arc ...

Embodiment 2

[0043] The design method of the dune-like microstructure with high-efficiency air drag reduction function of the present invention is as follows:

[0044] In the first step, a geometric model of the flow field with an area size of 15mm×15mm×45mm is established. A buffer zone of 15mm length is set in the front and back sections of the flow field area, and 15mm is reserved in the middle area to arrange the microstructure array.

[0045] The second step is to establish a geometric model of the imitated sand dune microstructure. The height H is set to 50μm, the length L is set to 250μm, and the center of the first arc is O 1 Located at the left end of the microstructure bottom surface and perpendicular to the vertical line of the bottom surface, corresponding to the central angle θ 1 Set to 20°, the second arc circle center O 2 Located at the highest point of the microstructure and perpendicular to the vertical line of the bottom surface, corresponding to the central angle θ 2 Set to 25°...

Embodiment 3

[0052] The design method of the dune-like microstructure with high-efficiency air drag reduction function of the present invention is as follows:

[0053] In the first step, a geometric model of the flow field with an area size of 15mm×15mm×45mm is established. A buffer zone of 15mm length is set in the front and back sections of the flow field area, and 15mm is reserved in the middle area to arrange the microstructure array.

[0054] The second step is to establish a geometric model of the dune-like microstructure. The height H is set to 60μm, the length L is set to 300μm, and the center of the first arc is O 1 Located at the left end of the microstructure bottom surface and perpendicular to the vertical line of the bottom surface, corresponding to the central angle θ 1 Set to 30°, the second arc circle center O 2 Located at the highest point of the microstructure and perpendicular to the vertical line of the bottom surface, corresponding to the central angle θ 2 Set to 35°, the thi...

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Abstract

The invention discloses a sand dune-like microstructure with high-efficiency air drag reduction function on the surface and an optimization design method thereof. First, the method of computational fluid dynamics (CFD) is used to construct the transverse array of dune-like microstructure in the flow field region,. The drag reduction rate was obtained by using Reynolds average numerical simulation(RANs) and Fluent solver, and with the total pressure drop as the calculation index. Finally, the dune-like microstructure parameters with high-efficiency air drag reduction function were optimized tomeet the expected goal. Compared with the traditional biomimetic drag reduction microstructure, the dune-like microstructure design method with high-efficiency air drag reduction function provided bythe invention has the universality for different flow field states. In addition, the method provided by the invention can save the design cost, shorten the design cycle, reduce the design loss, and provide a certain reference for the aerodynamic structure design of the aircraft.

Description

Technical field [0001] The invention belongs to the technical field of surface drag reduction, and in particular relates to a design method for dune-like microstructures with high-efficiency air drag reduction functions on the surface. The dune-like microstructure surface with high-efficiency air drag reduction function designed by the invention has important practical significance for reducing the energy consumption of the aircraft in the service process and saving fuel resources. Background technique [0002] At present, major national strategies and international aviation market demand have led China's civil aircraft manufacturing industry to enter a period of rapid development, and it faces huge challenges in entering the international civil aircraft market. my country's civil large-scale passenger aircraft C919, C9X9, and civil regional passenger aircraft ARJ21 have urgent needs to improve economy, safety, and environmental protection. The actual flight statistics of large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor 沈一洲江家威陶杰侯文卿贾振峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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