@article{chen_chen_hua_maier_burdette_2024, title={Experimental assessment of blowing effect on vehicle performance and aero-acoustics in small-rotor/wing interaction}, volume={3}, ISSN={["1741-2986"]}, url={https://doi.org/10.1177/10775463241236303}, DOI={10.1177/10775463241236303}, abstractNote={ The tiltrotor design for urban air mobility (UAM) combines vertical take-off and landing (VTOL) capability with fixed-wing efficiency. However, it confronts challenges posed by downward force due to rotor wake effect. Previous research has employed active flow control, such as blowing air, primarily during forward flight using a single air outlet slot. However, the implications for rotor performance and aero-acoustic characteristics have remained unexplored. The experimental approach in this study involves controlled blowing air with moderate momentum in hover mode, concentrating on rotor performance, download force, noise signature, and the influence of port patterns. It is found that the radial port pattern emerges as pivotal for mitigating downward force and augmenting rotor efficiency. The efficacy of noise reduction hinges on both receiver orientation and port pattern selection. This investigation significantly contributes to understanding the role of blowing effect in optimizing tiltrotor designs, particularly in the context of rotor wake-wing interaction. }, journal={JOURNAL OF VIBRATION AND CONTROL}, author={Chen, Mingtai and Chen, Yuhan and Hua, Jie and Maier, Nick and Burdette, Dylan}, year={2024}, month={Mar} }
 @article{chen_hua_maier_burdette_2023, title={Acoustic measurements in single-rotor/wing interaction at low disk loading and Reynolds number}, volume={12}, ISSN={["2048-4003"]}, url={https://doi.org/10.1177/1475472X231225630}, DOI={10.1177/1475472X231225630}, abstractNote={ The tiltrotor design is favored for urban air mobility (UAM) prototypes due to the combination of vertical takeoff and landing (VTOL) capability and efficient forward flight. With rising UAM air traffic at low altitudes, noise from these aircraft is a crucial design factor. Most tiltrotor noise research focuses on high disk loading and Reynolds number setups, leaving smaller aircraft configurations less explored. This study investigates aero-acoustic trends from rotor-wing interaction at low disk loading ([Formula: see text]100 N/m2) and Reynolds number (Re < 100,000). While prior literature suggests lowering disk loading and reducing rotor wake interference can mitigate rotor noise, such ideas lack empirical validation. The setup involves an anechoic chamber housing a two-blade rotor, along with flat and NACA 0012 airfoil wings. Microphones and a rotation stage capture acoustic data for analysis. Factors like flow recirculation, isolated rotor noise, rotor height, rotation direction/rate, and wing curvature are assessed for impact on noise signature. It is found that the deflected rotor wake in rotor-wing interaction significantly increases low-frequency broadband noise and overall sound pressure level (OASPL), compared to an isolated rotor. Dominant tonal noise diminishes based on the strength of the deflected rotor wake. These findings offer insights into reducing noise from rotor wake impingement on the wing. }, journal={INTERNATIONAL JOURNAL OF AEROACOUSTICS}, author={Chen, Mingtai and Hua, Jie and Maier, Nick and Burdette, Dylan}, year={2023}, month={Dec} }