Liquid rocket combustion chamber acoustic characterization
Over the last 40 years, many solid and liquid rocket motors have experienced combustion instabilities. Among other causes, there is the interaction of acoustic modes with the combustion and/or fluid dynamic processes inside the combustion chamber. Studies have been showing that, even if less than 1%...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Instituto de Aeronáutica e Espaço (IAE)
2010-09-01
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| Series: | Journal of Aerospace Technology and Management |
| Subjects: | |
| Online Access: | http://www.jatm.com.br/papers/vol2_n3/JATMv2n3_p269-278_Liquid_rocket_combustion_chamber_acoustic_characterization.pdf |
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| author | Cândido Magno de Souza Luiz Carlos Sandoval Góes Dimas Donizeti da Silveira Rogério Pirk Carlos d’Andrade Souto |
| author_facet | Cândido Magno de Souza Luiz Carlos Sandoval Góes Dimas Donizeti da Silveira Rogério Pirk Carlos d’Andrade Souto |
| author_sort | Cândido Magno de Souza |
| collection | DOAJ |
| description | Over the last 40 years, many solid and liquid rocket motors have experienced combustion instabilities. Among other causes, there is the interaction of acoustic modes with the combustion and/or fluid dynamic processes inside the combustion chamber. Studies have been showing that, even if less than 1% of the available energy is diverted to an acoustic mode, combustion instability can be generated. On one hand, this instability can lead to ballistic pressure changes, couple with other propulsion systems such as guidance or thrust vector control, and in the worst case, cause motor structural failure. In this case, measures, applying acoustic techniques, must be taken to correct/minimize these influences on the combustion. The combustion chamber acoustic behavior in operating conditions can be estimated by considering its behavior in room conditions. In this way, acoustic tests can be easily performed, thus identifying the cavity modes. This paper describes the procedures to characterize the acoustic behavior in the inner cavity of four different configurations of a combustion chamber. Simple analytical models are used to calculate the acoustic resonance frequencies and these results are compared with acoustic natural frequencies measured at room conditions. Some comments about the measurement procedures are done, as well as the next steps for the continuity of this research. The analytical and experimental procedures results showed good agreement. However, limitations on high frequency band as well as in the identification of specific kinds of modes indicate that numerical methods able to model the real cavity geometry and an acoustic experimental modal analysis may be necessary for a more complete analysis. Future works shall also consider the presence of passive acoustic devices such as baffles and resonators capable of introducing damping and avoiding or limiting acoustic instabilities. |
| first_indexed | 2024-12-11T20:21:46Z |
| format | Article |
| id | doaj.art-42e6fb9fd09e4f28b78133da1904d00c |
| institution | Directory Open Access Journal |
| issn | 1984-9648 2175-9146 |
| language | English |
| last_indexed | 2024-12-11T20:21:46Z |
| publishDate | 2010-09-01 |
| publisher | Instituto de Aeronáutica e Espaço (IAE) |
| record_format | Article |
| series | Journal of Aerospace Technology and Management |
| spelling | doaj.art-42e6fb9fd09e4f28b78133da1904d00c2022-12-22T00:52:03ZengInstituto de Aeronáutica e Espaço (IAE)Journal of Aerospace Technology and Management1984-96482175-91462010-09-0123269278Liquid rocket combustion chamber acoustic characterizationCândido Magno de SouzaLuiz Carlos Sandoval GóesDimas Donizeti da SilveiraRogério PirkCarlos d’Andrade SoutoOver the last 40 years, many solid and liquid rocket motors have experienced combustion instabilities. Among other causes, there is the interaction of acoustic modes with the combustion and/or fluid dynamic processes inside the combustion chamber. Studies have been showing that, even if less than 1% of the available energy is diverted to an acoustic mode, combustion instability can be generated. On one hand, this instability can lead to ballistic pressure changes, couple with other propulsion systems such as guidance or thrust vector control, and in the worst case, cause motor structural failure. In this case, measures, applying acoustic techniques, must be taken to correct/minimize these influences on the combustion. The combustion chamber acoustic behavior in operating conditions can be estimated by considering its behavior in room conditions. In this way, acoustic tests can be easily performed, thus identifying the cavity modes. This paper describes the procedures to characterize the acoustic behavior in the inner cavity of four different configurations of a combustion chamber. Simple analytical models are used to calculate the acoustic resonance frequencies and these results are compared with acoustic natural frequencies measured at room conditions. Some comments about the measurement procedures are done, as well as the next steps for the continuity of this research. The analytical and experimental procedures results showed good agreement. However, limitations on high frequency band as well as in the identification of specific kinds of modes indicate that numerical methods able to model the real cavity geometry and an acoustic experimental modal analysis may be necessary for a more complete analysis. Future works shall also consider the presence of passive acoustic devices such as baffles and resonators capable of introducing damping and avoiding or limiting acoustic instabilities.http://www.jatm.com.br/papers/vol2_n3/JATMv2n3_p269-278_Liquid_rocket_combustion_chamber_acoustic_characterization.pdfCombustion chamberCombustion instabilityAcoustic resonanceLiquid rocket engine (LRE) |
| spellingShingle | Cândido Magno de Souza Luiz Carlos Sandoval Góes Dimas Donizeti da Silveira Rogério Pirk Carlos d’Andrade Souto Liquid rocket combustion chamber acoustic characterization Journal of Aerospace Technology and Management Combustion chamber Combustion instability Acoustic resonance Liquid rocket engine (LRE) |
| title | Liquid rocket combustion chamber acoustic characterization |
| title_full | Liquid rocket combustion chamber acoustic characterization |
| title_fullStr | Liquid rocket combustion chamber acoustic characterization |
| title_full_unstemmed | Liquid rocket combustion chamber acoustic characterization |
| title_short | Liquid rocket combustion chamber acoustic characterization |
| title_sort | liquid rocket combustion chamber acoustic characterization |
| topic | Combustion chamber Combustion instability Acoustic resonance Liquid rocket engine (LRE) |
| url | http://www.jatm.com.br/papers/vol2_n3/JATMv2n3_p269-278_Liquid_rocket_combustion_chamber_acoustic_characterization.pdf |
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