Volume 2, 2011Progress in Propulsion Physics
|Page(s)||389 - 404|
|Section||Hybrid Rocket Propulsion|
|Published online||01 October 2012|
The characteristics of turbulent surface flow in planar channel with imposed wall blowing
Konkuk University Gwangjin-gu, Hwayang-dong 1, Seoul 143-701, Korea
A recent study for cold flow development in an idealized hybrid rocket motor showed that energy spectra of streamwise velocity in the vicinity of the wall exhibited a peculiar local peak at a certain frequency. It is believed that the occurrence of this particular frequency, or time scale, is a direct consequence of flow modification resulting from the interaction of the main oxidizer flow with wall blowing during the process of regression. If external disturbances resulting from white noise or modified injector geometry are imposed on this hybrid system, a sudden amplification of flow instability may be realized in the form of violent oscillation. In this study, a Large Eddy Simulation (LES) technique was used to investigate the response of the flow in the vicinity of the propellant surface to the external forcing applied to the flow field. Results showed that both concentrated and distributed momentum forcings used in the present study did not lead to a sudden growth of instability or disastrous oscillation. However, the pressure field is thought to be more sensitive to the external forcing and exhibits relatively larger oscillations.
© Owned by the authors, published by EDP Sciences, 2011