Influence of flow parameters on the dynamic performance for the supersonic jet element

The influence of the inlet and outlet flow parameters on the dynamic performance for the supersonic jet element have been investigated numerically in details. And the precision and errors accumulation of the numerical method has also been estimated. The influence of the main jet pressure and the mass flow rate of the control flow on the output thrust as well as the switching time have been deeply studied. The results have shown that increasing the mass flow rate of the control flow can shorten the switching time and increase the effective thrust slightly, but it also can enhance the unsteadiness of flow in the wall-attached work state but decrease the energy utilization rate of the supersonic jet flow component. The effective thrust generated by the cold air is larger than the gas work medium. And the switching time for the gas working medium is also shorter, which is more conducive to the completion of the switch process. The vortical structures at different switching time together with the force variations inside the jet element have been obtained computationally and analyzed in details.