DME 커먼레일 시스템을 위한 인젝터 분사 유량 개선 = Injection Flow Rate Improvement of Injectors for DME Common-rail Systems

다국어 초록 (Multilingual Abstract)

In this study, injection flow rates and material of the solenoid sealing of the injectors were improved for the development of a di-methyl Ether(DME) common-rail system. To deliver the same amount of energy provided by injection pressure of diesel p inj =160 mpa, the DME injectors need to have large diameter of nozzle hole and more No. of hole low injection pressure of p inj =40~50 Mpa. The simplified nozzle flow model, which takes account of nozzle geometry and hole and injection con-dition, was employed in other to design the concept of a injector nozzle such as No. of hole, diameter of hole and diameter of needle seat, etc. Injection amount and rate were tested by diesel and DME test stand. As a result, the diameter of nozzle hole were enlarged by 0.25 mm. The diameter of the orifice in the high pressure line was increased by 1.0 mm to maintain hydraulic force in the nozzle. The material of the solenoid sealing was changed to HNBR, which was strong against the cor-rosive. Experimental results showed that the injection amount of the DME injector drastically increased by 191.9% compare-ison to that of diesel at p inj = 40 MPa