In this study, aeroacoustic computational analyses were performed for multi-rotor blades of urban air vehicles using the immersed boundary-lattice Boltzmann method (IB-LBM) on a parallel GPU platform with multi-level grids. Tests of various rotational rates and grid-convergence with different grid resolutions for an APC 11x8 Sport drone propeller were conducted to verify the accuracy of the present method for predicting thrust and sound pressure level at blade passing frequency and its harmonics. IB-LBM validation showed reasonably accurate estimation through comparison with experimental data. Computation for NASA X-57 Maxwell propellers were also conducted with arrangement settings at various vertical distances to discover the aeroacoustic properties of propellers. Twin propellers with vertical offset were found to reduce the sound pressure level at second harmonic frequency by 7~10dB.
|Translated title of the contribution
|Aeroacoustic Computation of the Immersed Boundary-lattice Boltzmann Method for Multi-rotor Blades of Urban Air Mobility Vehicles
|Number of pages
|Journal of the Korean Society for Aeronautical and Space Sciences
|Published - 2023 Mar
Bibliographical notePublisher Copyright:
© 2023 The Korean Society for Aeronautical and Space Sciences.
ASJC Scopus subject areas
- Aerospace Engineering