A fluid delivery system includes a flow agitator connected to a gas conduit and disposed within an internal cavity of the conduit at an upstream location with respect to a fluid injector. The flow agitator operates to separate the gas flow passing through the conduit during operation into a bypass flow, a control flow, and a main flow, such that a recombination of the bypass flow, the control flow, and the main flow downstream of the flow agitator creates an oscillation in the gas flow that also encompasses the fluid delivered into the internal cavity by the injector.