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AMESim을 이용한, GDI 엔진에서 연료의 분사조건 변화에 따른 분사량 변화 예측
신석신 ( Suk Shin Shin ),손진근 ( Jin Geun Song ),박종호 ( Jong Ho Park ) 한국분무공학회 2013 한국액체미립화학회지 Vol.18 No.1
In case of GDI engine, shape of injected mass are one of the most important factors for good fuel eff-ciency and power. But it should be too inefficient and difficult to acquire injection mass data by experiment because condi-tion in engine vary with temperature, pressure, and so on. So, this paper suggests the AMESim (Advanced Modeling Environment for Simulation of Engineering Systems) as simulation program to calculate injection mass. For both simulation and experiment, n-heptane is used as fuel. In AMESim, I modeled the GDI infector and simulated several cases. In experi-ment, I acquired the injection mass using Bosch method to apply ambient pressure. The AMESim show reasonable result in comparison with experimental data especially at injection pressure 15 MPa. Other conditions are also in good accord with experimental data but error is a little bit large because the injection mass is so low.
이기수 ( G S Lee ),신석신 ( S S Shin ),박종호 ( J H Park ) 한국분무공학회 2013 한국액체미립화학회지 Vol.18 No.1
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