Journal of Vibration and Sound

Journal of Vibration and Sound

Numerical analysis of jet engine noise with Mach number 0.75 using Detached Eddy Simulation method

Document Type : research article

Authors
Ehsan Yari
Mahmood Adami
Sofia Edalatkhah
Faculty of mechanical engineering, Malek Ashtar university of technology
Abstract
The aim of this paper is to numerically analyze the noise radiated from a nozzle with Mach 0.75 using a numerical method. The numerical analysis was performed using the computational fluid dynamics method and ANSYS-FLUENT software. In order to model the flow disturbance around the jet, the DES turbulence model was used. DES is a hybrid model that has properties between large vortex simulation and Reynolds-averaged Navier-Stokes. Due to the time-consuming and complex nature of large vortex simulation, in this paper, DES model is used to extract data faster and evaluate its accuracy. A jet with a diameter of 0.05 m was used for operation under unsteady flow conditions. A fully organized network with a boundary layer is created, the inlet pressure is considered to be 147 kPa and at a distance of 30 times the jet diameter, the number of 14 receivers at different angles, which are standard distances mentioned in the sources, is considered and the noise is extracted, which decreases with increasing distance and angle from the jet outlet. The predicted sound pressure level for the observer locations has an average deviation of 6 dB from the measured levels and for most locations it has a deviation of 4.14 dB. The experimental data used for validation was provided by the Aerodynamic Studies Laboratory of Poitiers, France.
Keywords
Jet engine
aero-acoustics
Detached eddy simulation
computational fluid dynamics
Subjects
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Journal of Vibration and Sound
Volume 14, Issue 27 - Serial Number 27
September 2025
Pages 54-70