Anti-Phase Vortex Reduction Control for Rotor Noise Suppression

Nguyen, Nhan T.; Xiong, Juntao; Zahirudin, Raja Akif Raja; Yan, Sihong; Palacios, José

doi:10.2514/6.2021-2284

Cited by 1 publication

(1 citation statement)

References 9 publications

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“…Inspired by the vibration reduction benefit of the circumferentially varying blade stagger method in the NASA Ames 11-Foot-By-11-Foot Transonic Wind Tunnel, this author hypothesizes that if the harmonic reinforcement of the blade vortex structure could somehow be disrupted, acoustic attenuation benefits could potentially be realized. This leads to a number of acoustic reduction concepts that have been proposed to NASA Convergent Aeronautics Solutions (CAS) project in the past and most recently in 2017 [16]. Collectively, these proposed concepts are referred to as anti-phase rotor concepts.…”

Section: Anti-phase Rotor Conceptsmentioning

confidence: 99%

Investigation of Anti-Phase Asymmetric Quiet Rotor Technology

Cramer

Nguyen

Hernandez

et al. 2019

AIAA Scitech 2019 Forum

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The future of urban air mobility has a well-known tall pole challenge in the form of community acceptance which largely comes from the noise. This paper presents a proposed antiphase rotor technology that could reduce noise sources such as blade vortex interaction noise. The anti-phase rotor technology includes a rotor design with various anti-phase alternating trailing edge patterns and a rotor design with an asymmetric blade tip. Four small-scale antiphase rotors are fabricated by 3D printing for acoustic measurements conducted in a low-speed open-circuit wind tunnel to assess the effectiveness of the proposed anti-phase rotor technology. Preliminary test results appear to be promising and indicate that the anti-phase rotor designs could be a practical means of reducing blade vortex interactions and noise. The four tested antiphase rotor designs have peak acoustic performance depending on the RPM and thrust which suggests improved performance through design optimization could be achieved for specific mission requirements.

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Section: Anti-phase Rotor Conceptsmentioning

confidence: 99%