Experimental Investigation of Surface Roughness on the Flowfield and Aero-acoustics of Converging Nozzles

Chen, Mingtai; Power, Hunter; Stults, Emma; Mohan, Anil; Baby, Ruksana

doi:10.2514/6.2023-4447

AIAA AVIATION 2023 Forum 2023

DOI: 10.2514/6.2023-4447

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Experimental Investigation of Surface Roughness on the Flowfield and Aero-acoustics of Converging Nozzles

Mingtai Chen,

Hunter Power,

Emma Stults

et al.

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Cited by 3 publications

References 21 publications

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Synergizing computer‐aided design, commercial software, and cutting‐edge technologies in an innovative nozzle test apparatus for an engineering laboratory course

Chen

2024

Comp Applic In Engineering

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This study explores compressible flow, a field reliant on mathematical models for effective teaching. Using laboratory experiments as pedagogical tools, we introduce a compact nozzle test apparatus that integrates cutting‐edge technologies—additive manufacturing (AM), pressure‐sensitive paint, the Schlieren system, image processing, and computational fluid dynamics (CFD)—in a compressible flow laboratory course. Commercial software, including MATLAB, SOLIDWORKS, ANSYS Fluent, and LabVIEW, facilitates the incorporation of these technologies. The research outlines the course structure, objectives, and details of student projects. Through a comparative analysis of experimental results, analytical calculations, and CFD simulations, we showcase the successful integration of AM in pedagogical practices for compressible flow, addressing critical concerns like nozzle strength and surface roughness. Statistical data from student projects offer practical insights, ensuring accuracy in experimental applications. The laboratory's design and detailed lists of components and costs provide a meaningful comparison with a supersonic wind tunnel, considering manufacturing expenses, operational costs, spatial requirements, and noise levels. The assessment of lab report grades underscores the approach's efficacy in conveying compressible flow concepts successfully, facilitated by modern computers. In summary, our study presents a comprehensive, efficient, and technologically advanced approach to teaching compressible flow within a concise framework.

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Synergizing computer‐aided design, commercial software, and cutting‐edge technologies in an innovative nozzle test apparatus for an engineering laboratory course

Chen

2024

Comp Applic In Engineering

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Facilitating aerospace engineering senior design: Integrating lab curriculum redesign with student project and new technologies

Chen

2024

Engineering Reports

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This study addresses a gap in existing literature by exploring the impact of an aerodynamics laboratory course on students' readiness for senior design projects in Aerospace Engineering at North Carolina State University. The redesigned curriculum focuses on propellers, aligning with the increasing popularity of senior design projects involving fixed‐wing aircraft and multi‐rotor systems in the Mechanical and Aerospace Engineering Department. The updated course incorporates Additive Manufacturing (AM) and an anechoic chamber for the first time, outlining its structure, objectives, and pivotal concepts. The use of data acquisition codes streamlines experimentation while integrating AM accelerates practical applications of blade element theory (BET). Through an assessment of lab report grades, this initiative significantly enhances students' grasp of propeller concepts, marking a pivotal step in their preparation for senior design projects.

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Acoustic measurements in single-rotor/wing interaction at low disk loading and Reynolds number

Chen,

Hua,

Maier

et al. 2023

International Journal of Aeroacoustics

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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.

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Experimental Investigation of Surface Roughness on the Flowfield and Aero-acoustics of Converging Nozzles

Cited by 3 publications

References 21 publications

Synergizing computer‐aided design, commercial software, and cutting‐edge technologies in an innovative nozzle test apparatus for an engineering laboratory course

Synergizing computer‐aided design, commercial software, and cutting‐edge technologies in an innovative nozzle test apparatus for an engineering laboratory course

Facilitating aerospace engineering senior design: Integrating lab curriculum redesign with student project and new technologies

Acoustic measurements in single-rotor/wing interaction at low disk loading and Reynolds number

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