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Sifflement de diaphragmes en conduit soumis à un écoulement subsonique turbulent

Abstract : Orifices used as pressure drop devices in pipes of power plants can cause tonal noise. The consequences of whistling are noise and vibration levels higher than what is acceptable. The purpose of the present works is to study the whistling phenomenon with experiments and numeric in order to propose comprehension and prediction tools. One of the results of the study is the experimental and numerical identification of the acoustic amplification conditions at the orifice, which is a necessary phenomenon for whistling. The experiments show that the whistling ranges, expressed in a Strouhal number function of the orifice thickness and the flow velocity inside the orifice, lie between 0.2 and 0.4 and between 0.7 and 0.9 and that they are independent of the Reynolds number. The whistling ability of orifices has also been defined with numerical simulations. Two approaches are used, the first consisting of incompressible U-RANS calculations, the second based on compressible LES. The numerical simulations are able to capture the acoustic amplification at the orifice, for a spatial discretization small enough at the upstream edge of the orifice. Another result of the study is the definition of the parameters controlling the whistling features when acoustic reflections are present. A linear stability analysis is able to predict the whistling frequency, and it is shown that the whistling amplitude is maximum at a Strouhal number of 0.25 and that it increases with the global reflection surrounding the orifice.
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Submitted on : Monday, April 11, 2011 - 5:38:07 PM
Last modification on : Tuesday, March 31, 2020 - 3:21:03 PM
Long-term archiving on: : Tuesday, July 12, 2011 - 2:34:30 AM


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  • HAL Id : tel-00585131, version 1


Romain Lacombe. Sifflement de diaphragmes en conduit soumis à un écoulement subsonique turbulent. Autre [cond-mat.other]. Université du Maine, 2011. Français. ⟨NNT : 2011LEMA1003⟩. ⟨tel-00585131⟩



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