48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition 2010
DOI: 10.2514/6.2010-1152
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Extraction of Combustion Instability Mechanisms from Detailed Computational Simulations

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Cited by 7 publications
(6 citation statements)
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“…In particular, the peak vorticity §uctuation occurs near the same location as the peak heat release, an indication that the heat release is driven by vorticity generation at the step. Analyses of individual time intervals in this plot show that the pressure and heat release §uctuations are largely in phase, suggesting that the heat release is driving the disturbances [14]. It is emphasized that in both the numerical simulations and in the companion experiments, the instability was generated naturally from the combustion process and the chamber acoustics.…”
Section: High-fidelity Computationsmentioning
confidence: 99%
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“…In particular, the peak vorticity §uctuation occurs near the same location as the peak heat release, an indication that the heat release is driven by vorticity generation at the step. Analyses of individual time intervals in this plot show that the pressure and heat release §uctuations are largely in phase, suggesting that the heat release is driving the disturbances [14]. It is emphasized that in both the numerical simulations and in the companion experiments, the instability was generated naturally from the combustion process and the chamber acoustics.…”
Section: High-fidelity Computationsmentioning
confidence: 99%
“…A preliminary investigation into modeling the results of high-¦delity simulations to provide input to stability analysis is described below. Figure 10 The PSD analysis of hybrid RANS/LES results over an interval of 70 to 120 ms [14]: 1 ¡ smaller step; and 2 ¡ larger step Acoustic models should be limited to low-Mach-number applications that have boundaries corresponding well to acoustic approximations. The linearized Euler equations (LEE) model including mean §ow e¨ects and entropy waves is formulated for multiple-domains to account for mean- §ow property changes, and is generalized for physically-realistic boundary conditions to allow direct comparisons with higher-order computational §uid dynamics (CFD) models.…”
Section: Discussionmentioning
confidence: 99%
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“…[4][5][6] Smith et al investigated the high-frequency combustion instability in a single element rocket combustor by means of a non-zonal, hybrid RANS/LES method. 7,8 Although their computation method assumes an axisymmetric form, longitudinal instabilities for a rocket combustor are successfully captured and the mechanism of coupling between oscillating pressure and heat release rate is investigated in detail.…”
Section: Introductionmentioning
confidence: 99%