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  3. Vol. 14 No. 3 (2010)
  4. PASSIVE CONTROL OF SHOCK WAVE APPLIED TO HELICOPTER ROTOR HIGH-SPEED IMPULSIVE NOISE REDUCTION

PASSIVE CONTROL OF SHOCK WAVE APPLIED TO HELICOPTER ROTOR HIGH-SPEED IMPULSIVE NOISE REDUCTION

Abstract

A strong, normal shock wave, terminating a local supersonic area on an airfoil (or a helicopter blade), not only limits the aerodynamic performance, but also becomes a source of High-Speed Impulsive (HSI) noise. The application of a passive control system (a cavity covered by a perforated plate) on a rotor blade should reduce the noise created by the moving shock. This article describes numerical investigations focused on the application of a passive control device on a helicopter blade in high-speed transonic hover conditions to weaken the shock wave – the main source of HSI noise.

Keywords:

shock wave, passive control, perforated wall, transpiration, helicopter rotor in hover, high-speed impulsive noise

Details

Issue
Vol. 14 No. 3 (2010)
Section
Research article
Published
2010-09-30
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Author Biography

OSKAR SZULC,
Polish Academy of Sciences, Institute of Fluid-Flow Machinery



Authors

  • PIOTR DOERFFER

    Polish Academy of Sciences, Institute of Fluid-Flow Machinery

  • OSKAR SZULC

    Polish Academy of Sciences, Institute of Fluid-Flow Machinery

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