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기상분사용 LPG 기화기의 유량 및 압력특성에 대한 실험적 연구
박종영(Chongyoung Park),이범호(Beomho Lee),조승환(Shengwhan Cho),이대엽(Daeyup Lee),이병직(Byongjik Lee),최윤재(Yoonjae Choi) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
In order to satisfy more stringent emission regulations, it is required to control the fuel supply system with higher accuracy for LPG vehicles. Vaporizer, which is one of the important core parts in gaseous LPG injection system, functions not only to evaporate an LPG fuel and its pressure. thus in this work, pressure drop across the vaporizer in a gaseous LPG vehicle was measured and analyzed. Pressure drop occurs through orifices of pressure regulator and flow meter. As expected, pressure drop depends on flow rate, which increases when the more fuel is needed to be injected. Although Pressure sensor helps engine computer calculate the accurate amount of injected fuel depending on fuel pressure, it may be necessary to understand the pressure drop as a function of flow rate and coolant temperature. In this work, an experimental study of flow rate and pressure drop across the vaporizer was carried out.
기체분사용 LPG INJECTOR 오리피스 변화에 따른 분사량 변화 연구
김철숙(ChulSook Kim),이범호(Beomho Lee),주경석(Kyungsuk Joo),이대엽(Daeyup Lee),고세일,이병직(Byongjik Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Korea was ranked second to the top in terms of the number of LPG vehicles registered nationwide. And the state of the art technology on LPG fuel supply system of Korea is one of the best worldwide. Currently in many countries, the number of LPG vehicles are increasing and R&D on LPG vehicles are under way more actively than ever. The emissions from LPG vehicles are generally lower than from gasoline and diesel vehicles. Also LPG fueled vehicles have a potential to meet the next emission regulation such as SULEV. However. further studies with LPG fuel supply system are required to meet more strengthened emission regulation. In this study. an experiment was performed with gaseous LPG injecting system. In an injector. four orifices were varied to see its effect on reducing fluctuation of fuel injection amount. A result showed each orifice influences to the injection amount. Among them, the orifices D3 and D4 showed that they are under the influence of specific characteristics of flow rate. D3 and D4' diameters are relatively smaller than others, so their dimension was sensitive to injection amount, which implies that a better quality control on those specifications are necessary for more precise injection of LPG fuel.