Date of Award

Spring 2025

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

Anastasios S. Lyrintzis

Third Committee Member

Sheryl Grace

College Dean

James W. Gregory

Abstract

This research presents an in-depth investigation of the aeroacoustic characteristics of a scaled-down Joby Aviation rotor, focusing on its performance under realistic conditions for urban air mobility (UAM). Utilizing a high-fidelity numerical simulation approach that combines Large-Eddy Simulation (LES) and Unsteady Reynolds-Averaged Navier-Stokes (URANS) models, the study effectively captures the complex aerodynamic and acoustic interactions inherent in rotor operations. Validation of the numerical framework was achieved through comprehensive comparisons with available experimental data, demonstrating a high level of accuracy in predicting both aerodynamic performance metrics, including thrust and torque, as well as acoustic emissions. The simulation revealed significant impacts resulting from transient disturbances designed to emulate realistic urban gust conditions. These disturbances notably affected the aerodynamic loading on the rotor blades, resulting in observable variations in thrust and torque.

Additionally, a detailed analysis of wake structures revealed substantial alterations, characterized by intensified turbulence and increased vortex interactions. The research identified a marked increase in broadband noise attributable to these turbulent phenomena and the subsequent ingestion of vortical structures, underscoring the critical importance of accurately modeling transient effects for the development of UAM vehicles. The findings from this study underscore the importance of considering non-uniform inflow conditions and the dynamic interactions between rotor blades and turbulent wakes. These insights not only contribute to a deeper understanding of rotorcraft aeroacoustics but also provide valuable guidance for the design, optimization, and operational planning of advanced aerial mobility solutions aimed at minimizing noise pollution and enhancing public acceptance.

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