Abstract
A series of unsteadyReynolds-averaged Navier–Stokes computations aremade for a range of conditions pertinent to coaxial rocket injectors used on large liquid rocket engines with the intent of investigating unsteadiness resulting from hydrodynamic instabilities within the confines of the injector and in the near field of the injection point in the chamber. Axisymmetric simulations are conducted using a real fluid treatment for liquid oxygen and gaseous hydrogen propellants. An in-depth look inside the injector recess region was performed in an effort to characterize the dynamic character of mass flow pulsations created from hydrodynamic instabilities. Wake instabilities downstream of the liquid oxygen post tip, the acoustic pulsations within the liquid oxygen tube, and the vortex shedding from the injector lip all contribute to natural pulsations, even in the event of purely steady upstream and downstream conditions. The effects of varying the oxidizer/fuel ratio, the liquid oxygen post thickness, the liquid oxygen post length, and the liquid oxygen post acoustic frequency on injector frequency response were investigated.
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