In the present study, three-dimensional hypersonic flow simulations are conducted for an experimental measurement of RCS jet interactions performed on JAXA hypersonic wind tunnel facility. By comparing the simulated aerodynamic coefficients with experimental data for jet-on and jet-off cases, the accuracy of simulation is validated first. The fair agreements between the present CFD and the experiment are achieved for aero/RCS interactions. After the accuracy of simulation is confirmed, the flowfield results are examined further in detail to understand the interaction between RCS jets and hypersonic wake flows. The magnitude of the RCS jet interactions linearly increased as the mass flow rate ratio of the jet increased. The features of the wake flow with the RCS gas jet injection are very similar to those observed in an underexpanded jet in a supersonic crossflow (JISC). The RCS jet significantly alters the surface pressure distribution on the backshell. However, the changes in the aerodynamic coefficients due to the RCS jets are not significant since the backshell pressure in the hypersonic flow condition is very small compared to the forebody pressure.
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