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http://dx.doi.org/10.6108/KSPE.2017.21.2.009

Applications of Dynamic Mode Decomposition to Unstable Shock-Induced Combustion  

Kumar, P. Pradeep (Department of Aerospace Engineering, Pusan National University)
Choi, Jeong-Yeol (Department of Aerospace Engineering, Pusan National University)
Son, Jinwoo (School of Mechanical and Aerospace Engineering, Sejong University)
Sohn, Chae Hoon (School of Mechanical and Aerospace Engineering, Sejong University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.21, no.2, 2017 , pp. 9-17 More about this Journal
Abstract
Dynamic mode decomposition (DMD) method was applied for the further study of periodical characteristics of the unsteady shock-induced combustion. The case of Lehr's experiments was numerically simulated using 4 levels of grids. FFT result reveals that almost all the grid systems oscillate at frequencies around 430-435 kHz and the measureed one is around 425 kHz. To identify more resonant modes with low frequencies, DMD method is adopted for 4 grid systems. Several major frequencies are extracted and their damping coefficients are calculated at the same time, which is a quantification parameter for combustion stabilization.
Keywords
Shock-Induced Combustion(SIC); Combustion Instability; Dynamic Mode Decomposition(DMD);
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