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Prediction of aeroacoustic resonance in cavities of hole-pattern stator seals / David N. Liliedahl in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 2 (Fevrier 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 2 (Fevrier 2011) . - 10 p. Titre : Prediction of aeroacoustic resonance in cavities of hole-pattern stator seals Type de document : texte imprimé Auteurs : David N. Liliedahl, Auteur ; Forrest L. Carpenter, Auteur ; Paul G. A. Cizmas, Auteur Année de publication : 2012 Article en page(s) : 10 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Aeroacoustics  Channel  flow  External  flows  Flow  instability  Flow  simulation  Navier-Stokes  equations  Seals  (stoppers)  Stators  Turbomachinery  Vortices Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A Reynolds-averaged Navier–Stokes (RANS) solver developed in-house was used to simulate grazing channel flow past single and multiple cavities. The objective of this investigation was to predict fluid instabilities in hole-pattern stator seals. The numerical results generated with the RANS solver showed good agreement with those obtained using a commercial large eddy simulation code. In addition, the numerical results agreed well with experimental data. Rossiter's formula, a popular semi-empirical model used to predict frequencies of hole-tone acoustic instabilities caused by grazing fluid flow past open cavities, was modified using the RANS solver results to allow for its application to channel flows. This was done by modifying the empirical constant kappa, the ratio of vortex velocity, and the freestream velocity. The dominant frequencies predicted using Rossiter's formula with the new kappa value matched well with the experimental data for hole-pattern stator seals. The RANS solver accurately captured the salient features of the flow/acoustic interaction and predicted well the dominant acoustic frequencies measured in an experimental investigation. The flow solver also provided detailed physical insight into the cavity flow instability mechanism. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] [article] Prediction of aeroacoustic resonance in cavities of hole-pattern stator seals [texte imprimé] / David N. Liliedahl, Auteur ; Forrest L. Carpenter, Auteur ; Paul G. A. Cizmas, Auteur . - 2012 . - 10 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 2 (Fevrier 2011) . - 10 p. Mots-clés : Aeroacoustics  Channel  flow  External  flows  Flow  instability  Flow  simulation  Navier-Stokes  equations  Seals  (stoppers)  Stators  Turbomachinery  Vortices Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A Reynolds-averaged Navier–Stokes (RANS) solver developed in-house was used to simulate grazing channel flow past single and multiple cavities. The objective of this investigation was to predict fluid instabilities in hole-pattern stator seals. The numerical results generated with the RANS solver showed good agreement with those obtained using a commercial large eddy simulation code. In addition, the numerical results agreed well with experimental data. Rossiter's formula, a popular semi-empirical model used to predict frequencies of hole-tone acoustic instabilities caused by grazing fluid flow past open cavities, was modified using the RANS solver results to allow for its application to channel flows. This was done by modifying the empirical constant kappa, the ratio of vortex velocity, and the freestream velocity. The dominant frequencies predicted using Rossiter's formula with the new kappa value matched well with the experimental data for hole-pattern stator seals. The RANS solver accurately captured the salient features of the flow/acoustic interaction and predicted well the dominant acoustic frequencies measured in an experimental investigation. The flow solver also provided detailed physical insight into the cavity flow instability mechanism. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...]