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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.
Performance Requirement of Ship’s Speed in Docking/Anchoring Maneuvering
Kimio TATSUMI,Hidenobu FUJII,Takashi KUBOTA,Shigeyuki OKUDA,Yasuo ARAI,Nobuyoshi KOUGUCHI,Kozaburo YAMADA 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
Questionnaire survey on performance requirement of ship’s speed such as not only accuracy but also response and robustness were carried out, and the experiments to survey the GPS performances of static and dynamic characteristics were carried out simultaneously. In this paper, the questionnaire survey focusing on docking maneuvering, some analytic results of the survey, the results of GPS performance, and the possibility of adaptation for docking maneuvering on SDME and GPS are discussed. Consequently, from the results of questionnaire survey the performance requirement of ship’s speed in docking/anchoring maneuvering have need under 1cm/sec on the standard deviation, and speed information from GPS was adopted to use maneuvering information in docking/anchoring.