Effects of Freestream Turbulence on Cavity Tone and Sound Source
Joint Authors
Yokoyama, Hiroshi
Odawara, Hiroshi
Iida, Akiyoshi
Source
International Journal of Aerospace Engineering
Issue
Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-16, 16 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2016-12-12
Country of Publication
Egypt
No. of Pages
16
Abstract EN
To clarify the effects of freestream turbulence on cavity tones, flow and acoustic fields were directly predicted for cavity flows with various intensities of freestream turbulence.
The freestream Mach number was 0.09 and the Reynolds number based on the cavity length was 4.0 × 104.
The depth-to-length ratio of the cavity, D/L, was 0.5 and 2.5, where the acoustic resonance of a depth-mode occurs for D/L = 2.5.
The incoming boundary layer was laminar.
The results for the intensity of freestream turbulence of Tu = 2.3% revealed that the reduced level of cavity tones in a cavity flow with acoustic resonance (D/L=2.5) was greater than that without acoustic resonance (D/L=0.5).
To clarify the reason for this, the sound source based on Lighthill’s acoustic analogy was computed, and the contributions of the intensity and spanwise coherence of the sound source to the reduction of the cavity tone were estimated.
As a result, the effects of the reduction of spanwise coherence on the cavity tone were greater in the cavity flow with acoustic resonance than in that without resonance, while the effects of the intensity were comparable for both flows.
American Psychological Association (APA)
Yokoyama, Hiroshi& Odawara, Hiroshi& Iida, Akiyoshi. 2016. Effects of Freestream Turbulence on Cavity Tone and Sound Source. International Journal of Aerospace Engineering،Vol. 2016, no. 2016, pp.1-16.
https://search.emarefa.net/detail/BIM-1105020
Modern Language Association (MLA)
Yokoyama, Hiroshi…[et al.]. Effects of Freestream Turbulence on Cavity Tone and Sound Source. International Journal of Aerospace Engineering No. 2016 (2016), pp.1-16.
https://search.emarefa.net/detail/BIM-1105020
American Medical Association (AMA)
Yokoyama, Hiroshi& Odawara, Hiroshi& Iida, Akiyoshi. Effects of Freestream Turbulence on Cavity Tone and Sound Source. International Journal of Aerospace Engineering. 2016. Vol. 2016, no. 2016, pp.1-16.
https://search.emarefa.net/detail/BIM-1105020
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1105020