A simple nozzle geometry that efficiently atomizes a liquid is described and analyzed. In one of the two flow regimes produced by nozzle, flow-blurring occurs to produce a spray that is particularly well suited for clean efficient combustion. The two flow regimes are examined computationally. The flow blurring regime is found to develop as air is forced to flow into the fuel tube a short distance upstream counter to the flow of liquid fuel. The resulting interface between a toroidal vortex of air and the surrounding liquid fuel is thought to produce breakup as a result of Kelvin-Helmholtz instabilities. Shock waves in the two-phase mixture might also play an important role in breakup.
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