较大尺度波长结节翼在临界角附近的特性分析

doi:10.7527/S1000-6893.2024.30557

Abstract

Abstract:

In recent years， leading-edge serrations as a passive method for wing separation control have attracted significant attention in academia. This paper investigates the influence of two leading-edge tubercles with relatively large-scale wavelengths on the aerodynamics of a full-span wing near critical angles through numerical simulations. Compared to the baseline wing， the stalling process of the two improved wing shapes with larger-scale wavelengths is both slow and stable. By studying the surface flow characteristics through numerical simulations， we found that the wing with serrations having a wavelength of 1.5 times the chord length maintained a singular and regular flow pattern both before and after stalling， while the flow pattern of the wing with a wavelength equal to the chord length transitioned from a singular， regular flow to a more complex combination of multiple flow patterns as the angle increased. A mechanism is proposed to explain this transition in flow patterns， and two flow combination mechanisms are presented to explain the reasons for the different flow patterns.

Key words: airfoil, stall, leading-edge protuberances, flow control, flow pattern

CLC Number:

V221.3

Xiangying GUO, Jie XU, Yongchang HUANG. Characteristic analysis of large-scale wavelength protuberances wings near critical angle[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(S1): 730557.

Figures/Tables 12

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References 23

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Characteristic analysis of large-scale wavelength protuberances wings near critical angle

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