An experimental investigation to detect caviation in the nozzles of working Diesel injectors was conducted. Cavitation behavior of Diesel injectors was characterized by a non-dimensional cavitation parameter and a coefficient of discharge. Transient behavior in Diesel injectors with different needle opening pressures and different numbersof nozzle holes was observed and measured. The behavior of sharp-edged single and multi-hole injector tips was found to be reasonably consistent with established characteristics of cavitating nozzles, as observed in steady-state experiments and as predicted by a one-dimensional model. The measurement of flow through a rounded multi-hole tip was consistent with the known behavior of non-cavitating nozzles.
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