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http://dx.doi.org/10.6108/KSPE.2018.22.3.046

Linear Stability Analysis of a Baffled Rocket Combustor  

Lee, Soo Yong (Rocket Engine Team, Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.22, no.3, 2018 , pp. 46-52 More about this Journal
Abstract
A simple Crocco's $n-{\tau}$ time delay model and linear analysis of fluid flow coupled with acoustics are combined to investigate the high frequency combustion instability in the combustion chamber of LOX/hydrocarbon engines. The partial differential equation of the velocity potential is separated into ordinary differential equations, and eigenvalues that correspond to tangential resonance modes in the cylindrical chamber are determined. A general solution is obtained by solving the differential equation in the axial direction, and boundary conditions at the injector face and nozzle entrance are applied in order to calculate the chamber admittance. Frequency analysis of the transfer function is used to evaluate the stability of system. Stability margin is determined from the system gain and phase angle for the desired frequency range of 1T mode. The chamber model with variable baffle length and configurations are also considered in order to enhance the 1T mode stability of the combustion chamber.
Keywords
Linear Analysis; Combustion Instability; $n-{\tau}$ model; Frequency; Transfer Function;
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