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The authors are conducting tests of a newly devised rapidly operating secondary actuator (ROSA) aimed at providing controllable multiple injection. An injection test cell has been constructed. Two test setups are available for both diesel spray visualization and flow rate measurements. Up to six shots per cycle were implemented. A high-speed digital camera was used to have accurate data regarding spray dynamics. Processed data are obtained for liquid jet tip velocity, injection shots duration, and their delay with regard to electric setup. The stability of phasing lies within 50 μs. The shortest injection shot duration is 74 μs, maximum variability of duration is 50 μs.

A novel multiple injection technique has been applied to a common rail injection system. It is based on a rapidly operating electromagnetic secondary actuator (ROSA) that generates transient current to the primary injector solenoid. The system has produced up to six shots per cycle. A test cell was constructed to evaluate instantaneous flow rates. A laser-based measurement was applied to obtain centerline velocity. Numerous cycles were measured and processed to obtain time/angular resolved values of the flow rate and integrated mass related to each individual injection event. Applied flow metering technique can be widely introduced for calibrations of various high-pressure injection systems.