On the Use of Linear Acoustic Multiports to Predict Whistling in Confined Flows
2011 (English)In: Acta Acoustica united with Acustica, ISSN 1610-1928, Vol. 97, no 1, 24-33 p.Article in journal (Refereed) Published
The use of linear acoustic multiport models to analyse the existence of flow driven instabilities, that is - self-sustained oscillators or whistles - is addressed. By combining the scattering and reflection matrices for a system and searching for eigenfrequencies (zeros) in the critical half-plane, the existence of exponentially growing instabilities can be determined. In practice, the available frequency domain data are only known along the real axis; then the search for zeros may be done via the so-called Nyquist stability criterion generalized to an N-degree of freedom system. The method has been validated by two test cases, a T-junction and a Herschel-Quincke tube. In both cases, the occurrence and the frequencies of the self-sustained oscillations were correctly predicted.
Place, publisher, year, edition, pages
2011. Vol. 97, no 1, 24-33 p.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-29564DOI: 10.3813/AAA.918383ISI: 000286113700004ScopusID: 2-s2.0-78651483482OAI: oai:DiVA.org:kth-29564DiVA: diva2:395869
FunderTrenOp, Transport Research Environment with Novel Perspectives
QC 201102082011-02-082011-02-082012-06-12Bibliographically approved