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http://dx.doi.org/10.6108/KSPE.2017.21.5.001

Dynamic Characteristics Analysis of the Cryogenic Nitrogen Injection of Swirl Injector using POD and DMD  

Kang, Jeongseok (Department of Aerospace and Mechanical Engineering, Korea Aerospace University)
Sung, Hong-Gye (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Sohn, Chae Hoon (Department of Mechanical Engineering, Sejong University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.21, no.5, 2017 , pp. 1-9 More about this Journal
Abstract
The cryogenic nitrogen spray of a swirl injector has been numerically investigated using three dimensional LES turbulence model to analyze the dynamic characteristics under supercritical condition. To predict the precise nitrogen properties under supercritical condition, SRK equation of state, Chung's method for viscosity and thermal conductivity and Takahashi's correlation based on Fuller's theory for diffusion coefficient are implemented. The complex flow structures due to interaction between flow field and acoustic field are observed inside and outside the injector under supercritical condition. FFT, POD, and DMD techniques are employed to understand the coherent structures. By implementing the FFT, the dominant frequencies are identified inside and outside the injector. The coherent flow structures related to the dominant frequencies are visualized using the POD and DMD techniques. In addition, the DMD provides the damping coefficient which is related with the instability prediction.
Keywords
Swirl Injector; Large Eddy Simulation(LES); Cryogenic Nitrogen; Dynamic Mode Decomposition(DMD);
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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