Investigation on pressure oscillation propagation from combustion chamber to pipeline through injector

In order to investigate the effect of injector on pressure oscillation propagation from liquid rocket engine combustion chamber to pipe-line, the process of pressure oscillation propagation from combustion chamber to pipe-line was theoretically researched in this paper; and the transfer function was also deduced. The dynamic characteristic of pipe-line linked with various injectors was discussed. The influences of pipe-line length, combustion chamber pressure, injector type and configuration on pressure oscillation propagation process were calculated, the influence rule of injector and operating condition parameters on propagation process was gained finally.