Acoustic Cavities Design Procedures

Santana, A.; Silva, M. S.; Lacava, Pedro Teixeira; Góes, Luiz Carlos Sandoval

doi:10.5380/reterm.v6i2.61687

Cited by 2 publications

(1 citation statement)

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“…-engine operating speed), although this would not be an issue for a series hybrid stationary power plant. Santana et al [45] applied the principles of acoustic and resonance directly to combustion. Combustion instabilities can be detrimental to the combustor and its integrated system.…”

Section: Objectivesmentioning

confidence: 99%

Experimental investigation for characterizing and improving inlet designs in rotating detonation engines

Sisler¹

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Rotating detonation engines (RDEs) present great potential for significant improvement in efficiency for land based power generation systems, in addition to aircraft propulsion devices. They offer the advantage of a net pressure gain across the combustor, as well as high exhaust temperatures and less entropy production due to detonative combustion. These improvements provide direct correlation to improved overall efficiency and thermal efficiency of gas turbine engines. RDEs surpass their conventional combustor counterparts in terms of their geometric size and simpler mechanical design. Among many areas of much needed research to further the technology readiness level (TRL) of RDEs, the inlet design is paramount to the successful operation of a rotating detonation engine. The inlet is one of the central impetuses behind current RDE research.

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Section: Objectivesmentioning

confidence: 99%

Experimental investigation for characterizing and improving inlet designs in rotating detonation engines

Sisler¹

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Liquid rocket combustion chamber acoustic characterization

Pirk¹,

Souto²,

Silveira³

et al. 2010

JATM

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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.

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Acoustic Cavities Design Procedures

Cited by 2 publications

References 0 publications

Experimental investigation for characterizing and improving inlet designs in rotating detonation engines

Experimental investigation for characterizing and improving inlet designs in rotating detonation engines

Liquid rocket combustion chamber acoustic characterization

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