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Abstract
An alternative approach to assess the conditions for the onset of thermoacoustics combustion instability is proposed. The method is based on the analysis of the relation between the reflection coefficient of combustor upstream section (subsystems) with respect to the burner/flame, Rup, and the input reflection coefficient, Rin, as observed from the inlet of the burner with flame and all downstream subsystems of a combustion appliance. The instability of the combustor can be determined by evaluating the system dispersion relation expressed in the terms of these two reflection coefficients. The properties of the relation between Rin, the reflection coefficient of the burner downstream subsystems, Rdn, and elements of the flame transfer matrix, TM, of the burner are investigated. This relation has the form of the well-known Mobius transformation. Using the well-developed theory of the transformation, we derive the necessary conditions of Rdn to ensure that the magnitude of Rin becomes less than 1 in a frequency range. This condition results in a passive thermoacoustics stability of the system's operation. Furthermore, an optimum value of Rdn is derived which provides a minimum value of Rin at given entries of the burner TM. The practical application of the developed theory provides suitable criteria and guidelines for designing passive acoustic properties at the downstream side of the combustion appliance.
Original language | English |
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Title of host publication | Advances in Acoustics, Noise and Vibration - 2021 : Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021 |
Editors | Eleonora Carletti, Malcolm Crocker, Marek Pawelczyk, Jiri Tuma |
Publisher | Silesian University Press |
Number of pages | 8 |
ISBN (Electronic) | 9788378807995 |
Publication status | Published - 11 Jul 2021 |
Event | 27th International Congress on Sound and Vibration, ICSV 2021 - Prague, Virtual, Czech Republic Duration: 11 Jul 2021 → 16 Jul 2021 Conference number: 27 https://icsv27.org/index.php |
Conference
Conference | 27th International Congress on Sound and Vibration, ICSV 2021 |
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Abbreviated title | (ICSV27) |
Country/Territory | Czech Republic |
City | Prague, Virtual |
Period | 11/07/21 → 16/07/21 |
Internet address |
Bibliographical note
Publisher Copyright:© "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.
Keywords
- Combustion
- Flame transfer function
- Instability
- Passive termination
Fingerprint
Dive into the research topics of 'Mobius transformation between reflection coefficients at upstream and downstream sides of flame in thermoacoustics systems'. Together they form a unique fingerprint.Projects
- 1 Finished
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System based Thermo-Acoustic design of central heating Equipment
de Goey, L. P. H. (Project Manager), Kornilov, V. (Project member), van Griensven, J. G. H. (Project member), de Groot, T. G. A. P. (Project member) & Kojourimanesh, M. (Project member)
1/03/18 → 30/10/23
Project: Research direct
Research output
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Evaluation of the thermo-acoustic instability frequency and growth rate via input reflection coefficient measurement for central heating equipment
Kojourimanesh, M. (Corresponding author), Kornilov, V., Lopez Arteaga, I. (Editor) & de Goey, P. (Editor), May 2024, In: Combustion and Flame. 263, 14 p., 113425.Research output: Contribution to journal › Article › Academic › peer-review
Open AccessFile37 Downloads (Pure) -
Anechoic termination for acoustic plane wave suppression
Kojourimanesh, M. (Inventor), Kornilov, V. (Inventor), de Goey, P. (Inventor) & Lopez Arteaga, I. (Inventor), 29 Sept 2022, European Patent Office, Patent No. WO2022203508, 25 May 2021, Priority date 25 Mar 2021Research output: Patent › Patent publication
Open AccessFile -
Intrinsic thermo-acoustic instability criteria based on frequency response of flame transfer function
Kojourimanesh, M., Kornilov, V., Lopez Arteaga, I. & de Goey, P., 24 Aug 2022, Proceedings Internoise 2022. 8 p.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review
Open AccessFile