TY - CONF
T1 - Computational Analysis of a Model Coaxial Rotor Hub Wake
AU - Mobley, Forrest J.
AU - Coder, James G.
N1 - Funding Information:
This research was partially funded by the US Army’s National Rotorcraft Technology Center program, effort sponsored by the US Government under Other Transaction number W15QKN-10-9-0003 between Vertical Lift Consortium, Inc. and the Government, and by the Government under Agreement No. W911W6-17-2-0003. The US Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the US Government. Some images in this paper were created using FieldView, licenses for which were provided for the FieldView University Partners Program.
Publisher Copyright:
Copyright © 2022 by the Vertical Flight Society. All rights reserved
PY - 2022
Y1 - 2022
N2 - A model counter-rotating coaxial rotor hub in free-air was simulated using computational fluid dynamics as a comparison against experimental results. The simulation is performed using NASA's OVERFLOW 2.3d Reynolds averaged Navier-Stokes solver, and flow conditions are based on experiments performed in the 12-inch diameter water tunnel at ARL Penn State. Surface forces were examined, and harmonics in this data were computed and analyzed. The turbulent wake of the rotor hub was analyzed using frequency content as well as turbulent quantities related to the production and transport of turbulent kinetic energy. The lift spectrum showed different dominant frequencies for each counter-rotating hub, and the drag spectrum showed the expected dominant frequency for both parts of the hub. Frequency content of the velocity components in the wake showed positional biases towards the advancing side of each hub, opposing the results from past analyses of similar single rotor hubs. Reynolds stresses showed similar positional biases, and were also consistently concentrated in relatively small areas within the wake. The individual wakes of the hubs did not show signs of interaction until the far wake.
AB - A model counter-rotating coaxial rotor hub in free-air was simulated using computational fluid dynamics as a comparison against experimental results. The simulation is performed using NASA's OVERFLOW 2.3d Reynolds averaged Navier-Stokes solver, and flow conditions are based on experiments performed in the 12-inch diameter water tunnel at ARL Penn State. Surface forces were examined, and harmonics in this data were computed and analyzed. The turbulent wake of the rotor hub was analyzed using frequency content as well as turbulent quantities related to the production and transport of turbulent kinetic energy. The lift spectrum showed different dominant frequencies for each counter-rotating hub, and the drag spectrum showed the expected dominant frequency for both parts of the hub. Frequency content of the velocity components in the wake showed positional biases towards the advancing side of each hub, opposing the results from past analyses of similar single rotor hubs. Reynolds stresses showed similar positional biases, and were also consistently concentrated in relatively small areas within the wake. The individual wakes of the hubs did not show signs of interaction until the far wake.
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M3 - Paper
AN - SCOPUS:85135019295
T2 - 78th Vertical Flight Society Annual Forum and Technology Display, FORUM 2022
Y2 - 10 May 2022 through 12 May 2022
ER -