Progress and Challenges in Liquid Rocket Combustion Stability Modeling

Progress and challenges in combustion stability modeling in rocket engines are considered using a representative longitudinal mode combustor developed at Purdue University. The CVRC or Continuously Variable Resonance Chamber has a translating oxidizer post that can be used to tune the resonant modes...

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Bibliographic Details
Main Authors: Sankaran, V, Harvazinski, M, Anderson, W, Talley, D
Format: Report
Language:English
Subjects:
ALREST(ADVANCED LIQUID ROCKET ENGINE STABILITY TECHNOLOGY PROGRAM)
COMBUSTION
Combustion and Ignition
COMBUSTORS
COMPUTATIONAL FLUID DYNAMICS
Fluid Mechanics
HARMONICS
KINETICS
LES(LARGE EDDY SIMULATIONS)
LIQUID ROCKET ENGINES
OSCILLATION
OXIDIZERS
RAYLEIGH INDEX
REACTING FLOWS
RESONANCE
Rocket Engines
SPATIAL DISTRIBUTION
STABILITY
THREE DIMENSIONAL
WUAFRL3002125K
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Summary:Progress and challenges in combustion stability modeling in rocket engines are considered using a representative longitudinal mode combustor developed at Purdue University. The CVRC or Continuously Variable Resonance Chamber has a translating oxidizer post that can be used to tune the resonant modes in the chamber with the combustion response leading to self-excited high-amplitude pressure oscillations. The three-dimensional hybrid RANS-LES model is shown to be capable of accurately predicting the self-excited instabilities. The frequencies of the dominant first longitudinal mode as well as the higher harmonics are well-predicted and their relative amplitudes are also reasonably well-captured. Post-processing the data to obtain the spatial distribution of the Rayleigh index shows the existence of large regions of positive coupling between the heat release and the pressure oscillations. Differences in the Rayleigh index distribution between the fuel-rich and fuel-lean cases appears to correlate well with the observation that the fuel-rich case is more unstable than the fuel-lean case. Presented at the International Conference on Computational Fluid Dynamics (CCFD7) (7th) held in Big Island, Hawaii on 9-13 July 2012. The original document contains color images.