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http://dx.doi.org/10.6108/KSPE.2014.18.5.054

Rocket Plume Analysis with DSMC Method  

Jeon, Woojin (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology)
Baek, Seungwook (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology)
Park, Jaehyun (Department of Aerospace and System Engineering, ReCAPT, Gyeongsang National University)
Ha, Dongsung (Advanced Propulsion Technology Center, Agency for Defense Development)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.18, no.5, 2014 , pp. 54-61 More about this Journal
Abstract
In this study, a plume exhausted from rocket nozzle is investigated by using an unstructured 2-dimensional axisymmetirc DSMC code at various altitude. The small back-pressure to total-pressure ratio($P_b/P_o$) and large $P_b/P_o$ represent low and high altitude condition, respectively. At low altitude, the plume shows a typical complicated structure (e.g. Mach disk) of underexpanded jet while the high altitude plume experiences plain expansion. The various features of exhaust plume is discussed including density, translational/rotational temperature, Mach number and Knudsen number. The results shows that even at 20 km altitude where the freestream Knudsen number is small as $1.5{\times}10^{-5}$, the transitional and rarefied flow regimes can occur locally within the plume. It confirms the necessity of DSMC computation at low altitude.
Keywords
Rarefied Flow; Direct Simulation Monte Carlo; High Altitude; Rocket Plume;
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