Modares Mechanical Engineering

Modares Mechanical Engineering

Numerical investigation of imposed heat flux on the base and body of a missile and plume induced flow separation

Authors
hadiseh soltani 1
Sadjad Ghasemloo 2
Hamid Parhizkar 1
hamidreza talesh bahrami 3
1 Malek-Ashtar University of Technology
2 assistant professor, Malek e Ashtar University, Tehran
3 Iran University of Science & Technology
Abstract
Plume reversion due to missile ascending and related flow expansion and its interaction with missile body especially with missile base has been an important concern of investigators and missile designers. The aim of the current is investigation of effects of different parameters on the interaction of plume and missile body. To do this, heat flux on the missile body at different conditions including different flight conditions, turbulence modeling, base length and nozzle modeling has been studied. In the following, plume induced flow separation is studied. To model flow field, Gambit 2.4.6 and Ansys Fluent 17 are used for grid generation and flow simulation respectively. The results show that with increasing in flight height, plume at the base of missile gradually expands and finally covers the base completely. As well as, it can be seen that plume expands more rapidly in the base region and reduces heat flux when the nozzle is not considered. The reduction of heat flux is different in various parts of the base, ranging from zero to a maximum of 83% in areas far away from or near the nozzle. In the end, the effect of the base length was investigated. The results showed that as the base length is increased, the vortices are further expanded and this expansion leads to increased heat flux so that when the base length is doubled, the heat flux is increased by 20% at most
Keywords
Nozzle
Plume
Flow Separation
Base Heating
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Modares Mechanical Engineering
Volume 18, Issue 2
April 2018
Pages 2-9