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GDI 연료분사 시스템에서 분사압력이 분무발달과정과 미립화에미치는 영향 분석
송진근 ( Jin Geun Song ),김대식 ( Dae Sik Kim ),박성욱 ( Sung Wook Park ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
This study represents the spray development procedure and atomization regimes for a wide range of injection pressure for the Gasoline Direct Injection (GDI) system. To investigate the effect of injection pressure on the spray characteristics, injection pressure was swiped from 5MPa to 30MPa. Imaging method with a high-speed camera was used to take the spray sequential images, and the atomization regimes were predicted with dimensional analysis. The increase of injection pressure promoted spray atomization, which was supported by sequential spray images and the breakup regimes. However, the spray characteristics did not show significant differences for the injection pressure conditions over 20MPa.
연료분무 및 연소 2 : 다공형 GDI 인젝터의 분사압력이 미립화 특성에 미치는 영향에 관한 연구
이상훈 ( Sang Hoon Lee ),송진근 ( Jin Geun Song ),서영호 ( Young Ho Seo ),김현철 ( Hyun Chul Kim ),박성욱 ( Sung Wook Park ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
Objectives of this experimental study are to observe a behavior of jets propagation and to investigate the influence of injection pressure on the jet atomization process of a multi-hole gasoline direct injection (GDI) injector. For this study, droplet size and velocity were obtained using a 2-D PDPA (phase Doppler particle analyzer) system for injection pressures up to 30MPa. In addition, images of jet propagation as a function of time were captured using a visualization system with Nd: Yag laser. Results showed that droplet size and velocity distribution were closely related with injection pressure. Increasing injection pressure resulted in a linear reduction in droplet diameter of approximately 5μm
연료분무 및 연소 2 : 기계식 및 커먼레일식 디젤 인젝터의 연료 분무특성 비교
박쥰규 ( Jun Kyu Park ),이상훈 ( Sang Hoon Lee ),송진근 ( Jin Geun Song ),노현구 ( Hyun Gu Roh ),박성욱 ( Sung Wook Park ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
The purpose of this study is understanding spray characteristic of mechanical and common-rail injector. Because many parts of decrepit diesel engines are dumped even though they could be used by remanufacturing process, researches about remanufacturing engine go on recently. Especially, Fuel injection system of used mechanical diesel engine needs to be improved by applying common-rail system. Because of these reasons, comparisons of mechanical and common-rail injection characteristic should be investigated. In this study, it was revealed that spray development of common-rail injector is faster than that of mechanical injector based on same injection quantity and common-rail injector has an advantage of various injection condition because injection conditions such as injection pressure, energizing time are controlled dependently in common-rail system. Furthermore, contrary to mechanical system, injection rate could be adjusted by changing injection pressure and energizing time.