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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.28 SNIP: 0.421 CiteScore™: 0.9

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.900
pages 879-888

A COMPUTATIONAL STUDY OF THE L* INSTABILITY WITH A NONLINEAR FREQUENCY

K.R. Anil Kumar
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India
Krishnarajnagar Lakshmisha
, Indian Institute of Science, Bangalore 560012, India

RÉSUMÉ

A numerical model, including a nonlinear, transient gas-phase description of the propellant combustion is developed to study the L* instability in solid rocket motors. The model has been shown to predict the critical L* as well as other features of L* instability. It is found that stability boundary in log(L*cr) vs. log(p ) plane is not a straight line even with a constant pressure index, n, as given by QSHOD model. It is also found that parabolic stability boundary is possible with lower surface temperatures. The predicted frequency and combustion delay time compare well with the experimental data.


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