1961
DOI: 10.2514/8.5536
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Importance of Combustion Chamber Geometry in High Frequency Oscillations in Rocket Motors

Abstract: The experiments reported herein were concerned with the determination of some of the underlying factors which contribute to the occurrence of transverse modes of combustion pressure oscillation in rocket motors. Two rocket motors having different diameters and several different lengths were employed in the experiments using a gaseous hydrocarbon fuel and air as propellants. The investigation indicated that changes in the aspect ratio and volume of the rocket motor combustion chamber had a profound effect on th… Show more

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Cited by 12 publications
(5 citation statements)
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“…The latter assumption is consistent with experimental observations of tangentialmode behavior in a cylindrical combustor with a short length/ diameter ratio. 8 If the measurements of the wave amplitude taken close to the injector and the nozzle are nearly the same (with negligible phase difference) in combustors up to 6 in. long (see Fig.…”
Section: Discussionmentioning
confidence: 96%
See 1 more Smart Citation
“…The latter assumption is consistent with experimental observations of tangentialmode behavior in a cylindrical combustor with a short length/ diameter ratio. 8 If the measurements of the wave amplitude taken close to the injector and the nozzle are nearly the same (with negligible phase difference) in combustors up to 6 in. long (see Fig.…”
Section: Discussionmentioning
confidence: 96%
“…4 7 There is general agreement among these researchers that the pressure oscillations are sustained by a chemical reaction, rate-controlled mechanism. Although extensive experimental studies of transverse-mode oscillations 8 " 10 have been conducted utilizing cylindrical combustors burning premixed gases, the only theoretical treatment of the latter modes is the attempt by Culick 3 to extend his linearized analysis of the transverse modes in a liquid-propellant rocket to the case of a gas-burning combustor.…”
Section: Nomenclaturementioning
confidence: 99%
“…In this paper, however, the major emphasis will be placed upon the effect of the fuel composition. The influence of differences in combustion chamber geometry is presented in (1). 3 .…”
Section: Amplitude Of Oscillations Of the Longitudinal Mode Vs Chambmentioning
confidence: 99%
“…The combustion is focused in a certain cross section, i.e., the perturbation wavelength is much greater than the length of the combustion region. 4. The squared values of perturbations can be neglected, as compared with the values of perturbations proper.…”
mentioning
confidence: 99%
“…It is difficult to interpret the results of numerous available experiments because it is next to impossible to retain the regime parameters affecting the mixing processes unchanged when using another propellant. In addition, when some species of the propellant is changed, the physical parameters (evaporation heat, vapor elasticity, viscosity, and surface tension) also become different, and it is difficult to reveal the role of the kinetic factor [4]. Narrje and Reardon in their book dealing with unstable combustion [3] noted that the role of physicochemical properties of the propellant species in the high-frequency combustion mechanism was still unclear.…”
mentioning
confidence: 99%