EXPERIMENTAL DETERMINATION OF LIQUID ENGINES COMBUSTION CHAMBER ACOUSTIC CHARACTERISTICS

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FARSHCHI M.; MEHRJOU H.A.; FATEHI H.A.D.

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Journal: Sharif Journal of Civil Engineering Year:2007 | Volume:NEW SERIES (23) | Issue:37 Page(s): 89-97

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Title

EXPERIMENTAL DETERMINATION OF LIQUID ENGINES COMBUSTION CHAMBER ACOUSTIC CHARACTERISTICS

Author(s)

FARSHCHI M. | MEHRJOU H.A. | FATEHI H.A.D. | Issue Writer Certificate

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Abstract

Liquid rocket engines occasionally experience severe pressure fluctuations and flame oscillations resulting in injector damage and total engine failure. High frequency combustion instability is caused by the coupling between the combustion process and the combustion chamber acoustic field. Therefore, knowledge of the combustion chamber acoustic characteristics is essential in dealing with this phenomenon. An experimental approach for determination of the combustion chamber acoustic characteristics is outlined here. An acoustic laboratory, consisting of a hemi-anechoic room, sound generation, recording devices and complete three dimensional sweeping capabilities, has been designed and built. The experimental set up and the measurement procedures have been validated by determining natural acoustic modes of several sizes of open and closed ended cylindrical combustor. Such measurements and comparisons have provided insight into acoustic interaction in the three dimensional chamber and the effects of different boundary conditions. The phenomenon of the destruction of standing waves has been observed. Experimental results indicate that, at frequencies where the ratio of the wave length of the standing wave to the diameter of the chamber is about 1/7, the destruction of the standing wave is observed.Acoustic mode shapes and frequencies for combustor chambers, including the convergent part of the nozzle, have been measured and the results have been fitted with modified theoretical relations.

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APA: Copy

FARSHCHI, M., MEHRJOU, H.A., & FATEHI, H.A.D.. (2007). EXPERIMENTAL DETERMINATION OF LIQUID ENGINES COMBUSTION CHAMBER ACOUSTIC CHARACTERISTICS. SHARIF: CIVIL ENINEERING, NEW SERIES (23)(37), 89-97. SID. https://sid.ir/paper/128013/en

Vancouver: Copy

FARSHCHI M., MEHRJOU H.A., FATEHI H.A.D.. EXPERIMENTAL DETERMINATION OF LIQUID ENGINES COMBUSTION CHAMBER ACOUSTIC CHARACTERISTICS. SHARIF: CIVIL ENINEERING[Internet]. 2007;NEW SERIES (23)(37):89-97. Available from: https://sid.ir/paper/128013/en

IEEE: Copy

M. FARSHCHI, H.A. MEHRJOU, and H.A.D. FATEHI, “EXPERIMENTAL DETERMINATION OF LIQUID ENGINES COMBUSTION CHAMBER ACOUSTIC CHARACTERISTICS,” SHARIF: CIVIL ENINEERING, vol. NEW SERIES (23), no. 37, pp. 89–97, 2007, [Online]. Available: https://sid.ir/paper/128013/en

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