A dynamically scaled model of an element of a bipropellant rocket combustion chamber incorporating a phase change has been constructed. Photographic evidence of the flow patterns using particulate tracers in the model has substantiated a theoretical study of liquid jet gas entrainment. It has also indicated a possible driving mechanism for chugging and certain rotary modes of oscillation. The character of these oscillations is deduced to be similar to swosh in the low frequency amplitude limited case and to rotary screech in the high frequency amplitude divergent case. This latter case leads to boundary layer scrubbing with the resultant destruction of the boundary layer.
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