A study of the aerodynamics and acoustics of super-BVI

Hsuan Nien Chen, Kenneth Steven Brentner, Justin S. Shirey, Joseph Francis Horn, Shreyas Ananthan, J. Gordon Leishman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


Super-BVI was previously predicted during an aggressive right-turn maneuver. During this maneuver a substantial increase in noise was observed around the helicopter. This noise increase was found to be caused by the parallel interaction of a bundle of tip vortices with the rotor blades. Although this maneuver is aggressive in nature and somewhat uncommon during normal helicopter operation, it highlights the potential of tip-vortex bundling and the possibilities of creating substantial noise in certain flight maneuvers. Understanding this potential noise source could prove important in future helicopter quieting research. Based on this premise, further research into the conditions that cause super-BVI and its effects on rotor noise has been undertaken. It is concluded that the helicopter roll motion was the major contributor to super-BVI formation. To investigate the potential of the bundled tip vortices as a noise source in general helicopter operations, a roll oscillation maneuver is also discussed.

Original languageEnglish (US)
Title of host publicationAHS Internaitonal 62nd Annual Forum - Vertical Flight
Subtitle of host publicationLeading through Innovation - Proceedings
Number of pages15
Publication statusPublished - Dec 1 2006
Event62nd American Helicopter Society International Annual Forum 2006 - Phoenix, AZ, United States
Duration: May 9 2006May 11 2006

Publication series

NameAnnual Forum Proceedings - AHS International
ISSN (Print)1552-2938


Other62nd American Helicopter Society International Annual Forum 2006
CountryUnited States
CityPhoenix, AZ


All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Chen, H. N., Brentner, K. S., Shirey, J. S., Horn, J. F., Ananthan, S., & Leishman, J. G. (2006). A study of the aerodynamics and acoustics of super-BVI. In AHS Internaitonal 62nd Annual Forum - Vertical Flight: Leading through Innovation - Proceedings (pp. 797-811). (Annual Forum Proceedings - AHS International; Vol. II).