The sound field of a Tollmien–Schlichting wave
作者:
T. R. Akylas,
N. Toplosky,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1986)
卷期:
Volume 29,
issue 3
页码: 685-689
ISSN:0031-9171
年代: 1986
DOI:10.1063/1.865919
出版商: AIP
数据来源: AIP
摘要:
An asymptotic theory is presented for predicting the sound field generated by small‐amplitude instability waves in low‐speed boundary‐layer flows. A Tollmien–Schlichting wave of fixed frequency, which evolves spatially in a Blasius boundary layer, is considered, and the associated far‐field acoustic radiation is calculated. It is found that the directional dependence of the radiation intensity is of the dipole type. This result is discussed in connection with the superdirective acoustic fields caused by instability waves, which were recently observed in low‐Mach‐number jets.
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