Simulation study on injection characteristics of a new type of DME injector

According to the low pressure common-rail fuel system of dimethyl ether (DME) engine with controllable premix combustion, a new type of dimethyl ether common-rail injector has been developed, which can solve the problems about wear and leakage of plunger and barrel assembly in traditional fuel system The hydraulic dynamic simulation model of the injector has been established In order to find out the influence on fuel injection characteristic and response characteristic, some parameters of the injector have been researched, including stiffness of the spring, volume of the injecting chamber, diameter of spray holes and the number of oil hole. The research shows that the injector has stable injecting flow, there is favorable linearity relation between injection quantity and pulse width of oil supply; the stiffness of spring and the volume of injecting chamber have great influence on the injecting flow; diameter of spray holes and the number of oil hole can only affect the value of injecting flow, and affects little on injecting characteristic.