Numerical Study on the Dynamic Characteristics of the Inlet During ERJ Start-up
The problem of insufficient thrust for high Mach number operation of turbine and poor performance of low Mach number operation of ramjet can be effectively solved by Ejector Ramjet(ERJ)low Mach number relay turbine operating output thrust in multi-channel combined power.In this paper,a three-dimensional transient numerical simulation is used to analyse the ERJ full flow channel structure,aiming to study the influence of the rocket start-up process of the ERJ channel on the multi-duct combined cycle inlet and the performance characteristics of the ERJ channel during the modal transition from the turbine channel to the ERJ channel in combined turbine/rocket/ramjet multi-channel power.The following conclusions are obtained from the study:The high pressure region of the ERJ channel propagates with the rocket jet to the downstream nozzle region after the rocket starts at low operating condition,restricted and backward propagation in the nozzle region leads to the forward movement of the inlet terminal shock until it reaches the pressure equilibrium state and then stays in a certain region.The air flow in this channel is reduced by 20.72%,and the average thrust of ERJ channel is reduced by nearly 16%compared with the average thrust when the terminal shock stays in ERJ channel.Appropriate setting of rocket start-up and variable operating conditions are conducive to smooth transition of combined turbine/ERJ power thrust succession.
turbine based combine cycle engineERJ channelcombined inletnumerical simulation
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