In order to study the dynamic characteristics of liquid rocket engine injectors

theoretical analysis has been carried out for the plane orifice and centrifugal injectors."Frequency Method" was used for the numerical simulation of the injector dynamics.The results show that with the increase of pulse frequency

the flux swing of the plane orifice and centrifugal injectors decreases and the phase shift increases.With the increase of pressure

the flux swing increases and the phase shift decreases.Under the same condition

with the increase of the plane orifice injector's length or the geometric characteristics of centrifugal injectors

the swing decreases and the phase shift increases.With the increase of the spout length of centrifugal injectors

the phase shift increases while the swing is not affected remarkably.These results agree well with foreign investigations and establish the basis for further study.