Experimental investigation on water hammer pressure wave in high pressure common rail system

The water hammer pressure wave in high pressure common rail (CR) system plays an important role in the controlling of multi-injection. To get a deep insight on water hammer pressure wave phenomena, a detailed experimental study on a CR Multi-jet equipment of the solenoid type was conducted, including pressure time histories in the rail and at the injector inlet, as well as flow-rate, for the single and multi injection events. Mechanism of water hammer induced pressure oscillation was studied, and the relationships between wave frequency/amplitude and rail pressure/injection pulse width are clarified. The influence of water hammer pressure wave on multi-injection and consecutive injectors was summarized.