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Measuring the Acoustic Characteristics of a Helicopter Rotormodel in a Wind Tunnel

  • ATMOSPHERIC AND AEROACOUSTICS
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Abstract

The article presents the results of comparative experimental and computational studies of the acoustic characteristics of the model of a helicopter rotor performed in the modernized test section of the T-1K wind tunnel (WT). In order to identify and minimize the influence of spurious reflections on the studied acoustic characteristics using the Maximum Length Sequence method (M-sequence method) in the T-1K WT, we analyzed the microphone arrangement, which showed that the largest spurious contribution to the measured signal comes from reflections from the WT T-1K wall located behind the microphones. Comparison of the experimentally measured noise levels with the wall raised and lowered confirmed that the wall influences the measured acoustic noise characteristics of the model rotor. Comparison of experimental data with numerical simulation results allowed the conclusion that the WT T-1K modernized wind tunnel is fundamentally suitable to validate numerical methods of calculating the aeroacoustic characteristics of model rotors.

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ACKNOWLEDGMENTS

The authors sincerely thank V.F. Kopiev and S.A. Mikhaylov for posing the problem and discussing progress of the work, as well as the employees of the T-1K wind tunnel (Tupolev National Research Technical University, Kazan) for help in setting up and conducting the experiment.

Funding

The study was carried out as part of state task (topic no. 9.1577.2017/4/6 “Numerical and Physical Modeling of the Aerodynamic and Aeroacoustic Characteristics of helicopter Rotor Systems of Advanced Aircraft” and with financial support from the Ministry of Science and Higher Education of the Russian Federation (agreement no. 14.628.21.0011; unique agreement identifier RFMEFI62818X0011).

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Authors and Affiliations

  1. Tupolev National Research Technical University, 420111, Kazan, Russia

    V. V. Pakhov & K. V. Fayzullin

  2. Central Aerohydrodynamic Institute, Moscow Research Complex, 105005, Moscow, Russia

    S. L. Denisov

Authors
  1. V. V. Pakhov
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  2. K. V. Fayzullin
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  3. S. L. Denisov
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Correspondence to S. L. Denisov.

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Pakhov, V.V., Fayzullin, K.V. & Denisov, S.L. Measuring the Acoustic Characteristics of a Helicopter Rotormodel in a Wind Tunnel. Acoust. Phys. 66, 44–54 (2020). https://doi.org/10.1134/S1063771020010078

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  • DOI: https://doi.org/10.1134/S1063771020010078

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