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RISS 인기검색어
- 검색키워드
- 저자 : ( Masahide Takagi ) (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Development of a Spray Model for Swirl-Type Gasoline DI Injectors
Yasuo Moriyoshi,Masahide Takagi,Xiao Hu 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
Prediction of the mixture formation process inside a gasoline DI engine is strongly required to improve both the fuel consumption rate and the exhaust gas emissions. A swirl-type injector, widely used for a gasoline DI engine, is characterized with drastic changes of the cone angle caused by ambient pressure. Numerical simulations of a free spray formed by a swirl-type injector have been carried out on the basis of a method of DDM (Discrete Droplet Model). In this study, firstly the ambiguity how to give the initial conditions is discussed. Secondly, the droplet deformation calculated by a breakup model was incorporated into the drag force tenn to take the influence of the drag variation into account. As a result. by performing optimizations of the initial conditions, the breakup models and the drag force model, spray characteristics of a swirl-type injector were predicted quantitatively.<br/> <br/>
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2D Droplet Size and Velocity Analysis of a Fan-Shaped Spray Using Ilids Method
( Masato Yamada ),( Chang Seong Ryu ),( Yasuo Moryoshi ),( Ryo Uchida ),( Masato Kubota ),( Masahide Takagi ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
DI (direct injection) systems have been studied to improve thermal efficiency of gasoline engines. The analysis of spray behavior is important to examine the combustion characteristics of DI gasoline engines because fuel-air mixture formation is controlled by spray characteristics and gas motion. In this study, the characteristics of a fan-shaped spray, such as the droplet size, its velocity and the droplet-size distribution were simultaneously measured on a 2D plane by using an improved ILIDS (Interferometric Laser Imaging for Droplet Sizing) method. As a result, interesting relationships between the droplets diameter and the velocity were found. In addition, numerical analysis of a fan-shaped spray was conducted and the results were compared to the measured results. In numerical analysis, the nozzle internal flow was predicted by using VOF (Volume of Fluid) model that can simulate the two-phase flow inside the nozzle to give the liquid film formation process outside the nozzle. Using the results of VOF model for the initial conditions, numerical analysis of the spray by DDM (Discrete Droplet Model) was carried out to examine the droplets breakup process. As a result, SMD has become small with going away from the nozzle center section that is the same tendency as the experiment.
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