Effect of Wavy Leading Edges on Airfoil Trailing-Edge Bluntness Noise

Xing, Yudi; Chen, Weijie; Wang, Xingyu; Tong, Fan; Qiao, Weiyang

doi:10.3390/aerospace10040353

Cited by 5 publications

(5 citation statements)

References 39 publications

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“…The aerodynamic performance of airfoils featuring WLEs, designed based on humpback whale fins, exhibits the potential for improvement [6][7][8]. Investigations have demonstrated that WLEs can delay stall onset [9][10][11], reduce drag [12][13][14], mitigate shock buffeting [12,15], influence shock wave structure [15], and attenuate noise [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Bio-Inspired Wavy Leading-Edges on Aerodynamic Performance and Flow Topologies of the Airfoil

Du,

Jiang,

Yang

et al. 2024

Aerospace

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The characteristic of delayed airfoil stalls caused by the bio-inspired Wavy Leading-Edges (WLEs) has attracted extensive attention. This paper investigated the effect of WLEs on the aerodynamic performance and flow topologies of the airfoil through wind tunnel experiments, while also discussing the flow control mechanism of WLEs. The result shows that, at small Angle of Attack (AOA), the flow through the WLEs exhibits periodic and symmetrical characteristics, where flow vortices upwash at the trough and downwash at the crest, resulting in flow from the crest to the trough. Upwash leads to the formation of a localized three-dimensional laminar separation bubble (LSB) structure at the leading edge of the trough section. At large AOA after baseline airfoil stall, the flow on the airfoil surface of WLEs presents a two-period pattern along the spanwise direction, and the separation zone and the attachment zone appear alternately, indicating that the control effect of delayed stall is accomplished by reducing the separation zone on the airfoil surface. The alternating occurrence of the separation and attachment zones is the result of intricate interactions among flows passing through multiple WLEs. This interaction causes the convergence of high-momentum attached airflows on both sides, thereby constraining the spread of the separation from the leading edge and enabling the re-attachment of separated air. The research results of this paper provide a reference for researchers to reveal the flow control mechanism of WLEs more comprehensively.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Bio-Inspired Wavy Leading-Edges on Aerodynamic Performance and Flow Topologies of the Airfoil

Du,

Jiang,

Yang

et al. 2024

Aerospace

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“…It was observed that the sound power reduction level is sensitive to both the amplitude and wavelength, and that the wavy leading edge with a large amplitude and small wavelength can achieve the most considerable noise reduction effect. Numerical and experimental studies were conducted on airfoil by Xing et al [11,12] to investigate the effect of wavy leading edges on airfoil trailing-edge noise. They found that the trailing-edge noise of the baseline airfoil was significantly reduced by the wavy leading edges, and that the wavy leading edge with a larger amplitude and smaller wavelength had a better effect on the airfoil trailing-edge noise reduction.…”

Section: Introductionmentioning

confidence: 99%

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Gao,

Chen,

Tong

et al. 2024

Aerospace

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In this paper, a numerical investigation is performed to study the broadband noise of a fan stage with wavy trailing-edge blades. A study of the wavelength and ratio of amplitude to wavelength (H/L) is conducted to better understand the noise reduction effect of wavy trailing-edge blades. A rotor–stator interaction broadband noise prediction method based on the result of a Reynolds-averaged Navier–Stokes equation is used. The results show that all wavy trailing-edge configurations reduce the sound power level of the fan stage. The noise reduction effect of H20L10 is the best among all the wavy trailing-edge configurations, and the sound power level is reduced by 2.4 dB at 1000 Hz. When the H/L remains unchanged, the noise reduction effect of the wavy trailing-edge configuration increases with the increase in wavelength. When the wavelength remains unchanged, the noise reduction effect of the wavy trailing-edge configuration with an H/L of 2 is the best. The use of wavy trailing-edge configurations reduces the turbulent kinetic energy and turbulent integral length scale upstream of the stator by changing the wake of the rotor, thereby reducing the rotor–stator interaction broadband noise of the fan stage.

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“…Among several mechanisms for generating intrinsic airfoil noise, trailing edge blunting noise is an essential cause of vortex separation at blunt trailing edges. Xing et al [47] performed a numerical study of controlling noise due to airfoil blunting at the trailing edge using wavy edges inspired by nature and biotechnology. Aircraft use an integrated ejector that acts as an infrared suppressor to reduce the infrared signal with radar-acoustic stealth [48].…”

Section: Introductionmentioning

confidence: 99%

Solving Innovative Problems of Thrust Vector Control Based on Euler's Scientific Legacy

Sazonov,

Mokhov,

Gryaznova

et al. 2023

Civ Eng J

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This study aims to develop an interdisciplinary approach to solving innovative thrust vector control problems. The methodology involves the development of a working hypothesis about the ejection process when using a controlled nozzle to deflect the thrust vector (velocity vector) in any direction within a complete geometric sphere. When developing the working hypothesis, a multilateral analysis of individual facts and scientific and technical information is performed using tools in the "big data" area, assessing opportunities to apply the "Foresight" methodology for predicting the development of fluidics. The authors propose new mathematical models to describe the thrust vector in the distribution of the mass flow rate of the fluid medium between flow channels. Patents for inventions support the novelty of scientific results that reveal new opportunities for more active development of fluidics as applied to simple and complex jet systems with low and extremely high energy density in flows. The proposed methodology rests on a modern computer base and is a logical continuation and development of well-known Euler’s works. The computer simulation of multiflow jet devices mainly focuses on power engineering, production, and processing of hydrocarbons. Some results of this research work, including patented design developments and calculation methods, also apply to developing robotics, unmanned vehicles, and programable jet systems. The authors attribute further development of the interdisciplinary approach for solving inventive problems to the use of different AI options. Doi: 10.28991/CEJ-2023-09-11-017 Full Text: PDF

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Effect of Wavy Leading Edges on Airfoil Trailing-Edge Bluntness Noise

Cited by 5 publications

References 39 publications

Experimental Investigation of the Effect of Bio-Inspired Wavy Leading-Edges on Aerodynamic Performance and Flow Topologies of the Airfoil

Experimental Investigation of the Effect of Bio-Inspired Wavy Leading-Edges on Aerodynamic Performance and Flow Topologies of the Airfoil

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Solving Innovative Problems of Thrust Vector Control Based on Euler's Scientific Legacy

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