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Asociación Española de Normalización y Certificación-Comité Europeo de Normalización. Norma UNE-EN-ISO 3744:2010. Acústica: Determinación de los niveles de potencia acústica y de los niveles de energía acústica de fuentes de ruido utilizando presión acústica. Métodos de ingeniería para un campo esencialmente libre sobre un plano reflectante (ISO 3744:2010). 84 p. Julio, 2011.

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• TITLE: Measuring Sound Pressure Levels during Thermoacoustic Instabilities in Large Engines: Case Study

  AUTHORS: Alice Elizabeth González, José Cataldo Ottieri, Pablo Gianoli Kovar, Joaquín Montero Croucciée, Marcos Raúl Lisboa

  KEYWORDS: Thermoacoustic Instabilities, Large Engines, Real Scale Measurements

  JOURNAL NAME: Journal of Modern Physics, Vol.8 No.10, September 4, 2017

  ABSTRACT: This paper attempts to present some registers of sound pressure levels during the operation of large diesel engines (10 MW). During these registers we have found the preparation, occurrence and ending of events of thermoacoustic instability. They appear after a loosing of chaos period or a reduction in fluctuations in some frequencies. The most interesting phenomena were registered at low frequencies. However, they were accompanied by variations in sound emissions at medium and high frequencies. As there has been very little published data concerning these phenomena at real scale, it is imperative to point out that every quasi-stationary state we have measured during these episodes has lasted some minutes, significantly much more time than that of lab scale results.