Date of Award

Summer 7-2019

Access Type

Thesis - Open Access

Degree Name

Master of Science in Aerospace Engineering

Department

Aerospace Engineering

Committee Chair

R.R. Mankbadi

First Committee Member

Vladimir V. Golubev

Second Committee Member

John A. Ekaterinaris

Abstract

The emergent field of interest in the Urban Air Mobility community is geared towards a world where aerial vehicles are commonplace. This poses the problem of the effects of the radiated noise. The present research presents an in-depth analysis of the noise generation mechanism of a propeller as a mode of propulsion of the said aerial vehicles. Numerical simulation utilizing a Hybrid Large-Eddy Simulation (LES) coupled with Unsteady Reynolds-Averaged Navier-Stokes (RANS) solver, is adopted on an isolated propeller modeled from the commercial DJI Phantom II 9450 propeller. The Spalart-Allmaras one equation turbulence model with rotation/curvature correction is used. The Farassat’s 1A formulation of the Ffowcs-Willams-Hawkings equations are used with an off-body permeable porous stationary control surface for far-field noise predictions. The current results are found to be in good agreement with several observations including the thrust generated, the unsteady flow structure, and the radiated far-field sound spectra and directivity. A deeper study into the contributing sources of the noise generation both on the propeller surface, as well as in the swirling wake flow is performed.

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