Experimental Investigations of Aerodynamic Heating induced by Single and Double Side-jet on a Blunted Cone

摘要

The effects of aerodynamic heating associated with side-jet injection into hypersonic crossflow were investigated by using the Temperature Sensitive Paint (TSP). A single or double side-jet was employed to simulate the flow field caused by Reaction Control System (RCS) around a reentry vehicle. In the cases with single side-jet injection, distributions of heat transfer rate were obtained by TSP with high resolution at both angles of attack of 0 and 40 degree. Numerical simulation was additionally performed to analyze the interaction flow field and the mechanism of increment of heat transfer rate on the model surface. It was found that drastic increment of heat transfer rate was formed around the nozzle exit due to side-jet/hypersonic cross flow interaction. The distribution of the increased heat transfer rate shows similar shape to the attachment lines of vortices predicted by the numerical simulation. In the double side-jet cases, two nozzles arranged on lateral and longitudinal direction in three kinds of interval were investigated. By longitudinally positioning the double nozzle (i.e. in the flow direction), the heating distribution around the nozzle exit located on downstream was drastically reduced, although the model surface around the nozzle on upstream was heated as same as the single side-jet case. On the other hand, the laterally positioned double nozzles resulted the lower maximum value of heat transfer rate comparing to the single side-jet case.