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

Abstract

<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>