Realtime simulation modeling for integrated inlet and engine system based on normal shock position calculation

An integrated simulation for mixed compression supersonic inlet and engine system was conducted based on normal shock position calculation. A computation scheme was put forward to separate the inlet model into two parts, which were calculated respectively: the external part of the formula was used to compute the oblique shock to obtain internal inlet boundary conditions, and the internal part modelling by quasi onedimensional CFD was used to simulate the effect of back pressure on the normal shock position. Compared with twodimensional CFD simulation, it was found that this method can shorten the calculation time a lot on the premise of guaranteeing parameter accuracy effectively, resulting in a better realtime simulation ability. Further, the inlet model and engine componentlevel model were integrated to output dynamic coupling effects of these two systems. Finally, some necessary simulations were implemented, showing clearly that the integrated model could accurately emulate the dynamic and static influences between inlet norm shock position and the engine. When turbulence occurred in the incoming flow, the change of the normal shock position can be suppressed by adjusting the nozzle throat area and the compressor guide vane angle rapidly. The reduction of the thrust can be reduced by 50%.