Analysis of Acoustic Testing on Static Chevrons Nozzles

Varghese, Jerrin Thadathil; Sarath, S; Shafi, Mohamed Sufyan

doi:10.1109/icaset.2019.8714486

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…Various methods have proposed for reducing engine jet noise, without affecting other design parameters of the propulsion system. Some of these methods are the variable output nozzle using memory alloys [23][24][25], fan flow deflector [26][27][28] and the sinusoidal nozzles [29][30][31] as shown in Fig 4. Since 1996, many numerical and experimental studies on the performance of the serrated nozzles are conducted [32]. It can be concluded that the main source of noise in the nozzle is turbulent shear layer.…”

Section: Aeroacoustics In Aerospace Industriesmentioning

confidence: 99%

Synergy between Noise Reduction Techniques Applied in Different Industries: A Review

2020

IJM

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This review aims to assist aerodynamic noise in three industrial fields: Aerospace, Turbomachinery and Automotive. In this review the general terms in aeroacoustics is defined; and aerodynamic noise sources are recognized. The paper also reviews the brief literature on noise reduction techniques, with a particular focus on the state of the art numerical and experimental works. In Addition, developments in low speed designs for aerodynamic noise reduction, some passive and active methods for example serrated boundaries, porous media, noise absorber, and etc. are discussed. By investigating similarities in noise reduction techniques between these industries, this paper offers an outlook for noise reduction techniques in future.

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Section: Aeroacoustics In Aerospace Industriesmentioning

confidence: 99%

Synergy between Noise Reduction Techniques Applied in Different Industries: A Review

2020

IJM

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Study of Different Designs of Chevron for Effective Noise Reduction in Jet Engines

Rao

2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Due to their remarkable efficiency and efficacy, chevrons have emerged as a prominent subject of investigation within the Aviation Industry, primarily aimed at mitigating aircraft noise levels and achieving a quieter airborne experience. These chevrons function by inducing streamwise vortices into the shear layer, thereby augmenting the mixing process and resulting in a noteworthy reduction of low-frequency noise emissions. This paper aims to conduct a comparative computational analysis encompassing seven distinct chevron designs and one without chevrons. It also summarizes the previous works that led to the advancement of this technology. The size and configuration of the chevrons with the jet engine nacelle were designed to match the nozzle diameter of 100.48mm and 56.76mm, utilizing the advanced SolidWorks CAD modeling software. Subsequently, the computational analysis for each design was carried out using the SolidWorks Flow Simulation software. When it comes to civilian aircraft, it can be stated that the noise emitted in case of landing and take-off is comparatively high, so the parameters considered to solve the model were taken accordingly. The results were obtained in the form of acoustic power level contours and turbulent energy contours which unambiguously exhibit the effectiveness of each of the chevron designs that were taken into consideration for study. The acquired solutions were finally used for a comparative study among the designs. The results unequivocally demonstrated that the incorporation of chevrons consistently led to a reduction in sound pressure levels across all cases. Notably, the round-shaped chevron design exhibited superior performance compared to the other designs, boasting a substantial noise reduction of 2.85%.</div></div>

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Analysis of Acoustic Testing on Static Chevrons Nozzles

Cited by 2 publications

References 12 publications

Synergy between Noise Reduction Techniques Applied in Different Industries: A Review

Synergy between Noise Reduction Techniques Applied in Different Industries: A Review

Study of Different Designs of Chevron for Effective Noise Reduction in Jet Engines

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