http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
String Cavitation and 3D PIV in Multi-Hole Injector
( Hiroaki Nakano ),( Rubby Prasetya ),( Shinichiro Deguchi ),( Takashi Miwa ),( Akira Sou ),( Keiya Nishida ),( Akira Nakashima ),( Yoshitaka Wada ),( Yoshiharu Ueki ),( Hideaki Yokohata ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
It is essential to control fuel spray characteristics in diesel engines for cleaning up exhaust gases and improving combustion efficiency. Turbulent cavitating flow in fuel injectors plays an important role in fuel spray characteristics. String cavitation may occur in a sac and nozzles of multi-hole fuel injectors, which strongly affects fuel spray characteristics. It should be caused by the vortex flow in the sac. However, the occurrence mechanism of string cavitation has not been clarified yet. The purpose of this study is to clarify the mechanism and condition of string cavitation occurrence by conducting a high-speed visualization experiment in a transparent injector of cavitation and a discharged liquid jet at various needle lifts and flow rates. We also measure the three-dimensional flow field in the sac by 3D PIV. The transparent acrylic multi-hole mini-sac nozzle is designed to visualize cavitation. Sodium iodide aqueous solutions or diesel oil with α-methyl naphthalene is used as a working fluid to avoid the refraction at the surface of the acrylic walls and these liquids. As a result, it is found that at low needle lift string cavitation often occurs which is surrounded by a vortical flow in the sac and increases the discharged hollow-cone liquid jet angle, while at high needle lift thin and short string cavitation may occur, which does not strongly influence discharged liquid jet and spray. The probability of the string cavitation appearance under various conditions as well as the transient motion of string cavitation and liquid jet is also clarified.
Synchrotron-radiation-based <SUP>174</SUP>Yb Mossbauer Spectroscopy of the 1/1 Au-Al-Yb Approximant
Yumi Kinoshita,Hisao Kobayashi,Nobumoto Nagasawa,Yoshitaka Yoda,Ryo Masuda,Yuki Nakamura,Yuya Sakakibara,Kazuhiko Deguchi 한국물리학회 2023 새물리 Vol.73 No.12
The Yb-based valence-uctuating Au-Al-Yb quasicrystal exhibits unconventional quantum critical phenomena with unusual critical indices at low temperatures at ambient pressure. Furthermore, the quantum criticality of the Au-Al-Yb quasicrystal remains robust even under hydrostatic pressure. In contrast, the Au-Al-Yb 1/1 approximant does not display quantum criticality at ambient pressure and quantum criticality appears at approximately 2.0 GPa with the same critical indices as the quasicrystal. In this study, we conducted synchrotron-radiation (SR) -based <SUP>174</SUP>Yb Mossbauer spectroscopy on both the quasicrystal and 1/1 approximant, allowing us to observe di_erences in the 4f electronic states of Yb ions between the quasicrystal and 1/1 approximant.
Anauto motive collision avoidance control based on a feasible set
Masakazu Mukai,Yuji Harada,Junichi Murata,Taketoshi Kawabe,Hikaru Nishira,Yoshitaka Deguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper considers an optimal path generation problem that generates a path of an automobile without any collision with obstacles. The problem is formulated as a mixed integer programming problem. In the problem the obstacles and environments a round the automobile can be represent as inequality conditions. A feasible set called collision avoidable set (CAS) is considered to constract a driver assisit control.