Impact of acoustic boundary conditions on confined combustion noise
| Autor: | Franck Richecoeur, Sébastien Ducruix, Ammar Lamraoui, Thierry Schuller |
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| Přispěvatelé: | Lamraoui, Ammar |
| Rok vydání: | 2008 |
| Předmět: |
[SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph]
Test bench Materials science Acoustics and Ultrasonics Microphone Acoustics Combustion [SPI.MECA.MEFL] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Acoustique law.invention Pressure measurement Arts and Humanities (miscellaneous) law Combustor [PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] Spontaneous emission Boundary value problem Physics::Chemical Physics Bruit de combustion Combustion chamber [PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 0001-4966 |
| Popis: | The noise produced by aircraft engines at take‐off and landing can be very harmful for airport neighbors, an issue that became recently particularly crucial. While combustion instabilities, where a strong coupling between flames and acoustic modes of the combustion chamber cause very high levels of harmonic sound, the wide bandwidth noise emitted by confined flames in stable situations is less well‐documented. It has been recently shown by Tran et al. (2007) that varying the burner upstream acoustic boundary condition was a very efficient method for damping combustion instabilities and creating ideal conditions for the study of combustionnoise. In the present study, the noise level induced by stable combustion is investigated for various upstream conditions. The test bench consists in a swirl stabilized burner, connected to a rectangular combustion chamber, equipped with microphone ports for acoustic measurements. The 40 kW burner is composed of two identical stages fed with air and propane. A photomultiplier equipped with a narrow band filter measuring the CH* spontaneous emission from the flame is used to study heat release fluctuations in the flame. Time‐resolved measurements are carried out and spectral analysis of pressure measurements and light emissions are performed for various inlet impedances. |
| Databáze: | OpenAIRE |
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