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Toshiharu Tanaka,Takaaki Oiwa,Akira Kotani 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.11
A gear is used not only for power transmission but also in precision positioning. A conventional and general gear has only one degree of freedom motion. Therefore, the case of its use is limited. In this paper, we propose and manufacture an innovative spherical gear. The proposed spherical gear has a multiple degrees of freedom motion. Compared with other spherical gear, the proposed spherical gear does not have complex shape. Moreover, the handle of the proposed spherical gear is similar to that of a spur gear. The experimental apparatus using the spherical gear pair measures a transmission efficiency and an angular backlash between the gears. According to experimental results, the spherical gear teeth could mesh firmly and transmit power at any shaft angle. In addition, the maximum transmission efficiency and the angular backlash become about 87.1% and 16.9 mrad when the shaft angle is 0°, respectively.
X-Ray Imaging and Measurement of Cavitation Flow in Fuel Injector Nozzles with Various Geometries
( Rubby Prasetya ),( Takumi Kasahara ),( Kazuya Kotani ),( Takashi Miwa ),( Akira Sou ),( Seoksu Moon ),( Yoshitaka Wada ),( Yoshiharu Ueki ),( Hideaki Yokohata ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
Studies of in-nozzle cavitation are commonly carried out by conducting visualization experiments with optically accessible nozzle and visible spectrum light sources. However, multiple scattering occurs at the interface of in-nozzle cloud cavitation and discharged liquid jet, which prevents image acquisition of clear cavitation profile and liquid jet. In this study, X-Ray Phase Contrast Imaging (XPCI) is utilized to obtain a clear image of cavitation in several two-dimensional nozzles, as well as the discharged liquid jet of each nozzle. The XPCI was conducted at SPring-8 synchrotron light source. The nozzles used in this study have a width of 1 mm, with ratio of length and width LAV = 4. Upstream geometries of the nozzle are varied, with symmetrical and mini-sac upstream geometries. As a result, we can clearly capture the development of cavitation in the nozzle, from the start of nucleation to the formation of cavitation film in the nozzle. While cavitation film on symmetrical nozzle are relatively stable, mini-sac nozzle produces unstable cavitation film which moves laterally relative to the streamwise direction. The XPCI method also makes it possible to visualize individual bubbles in cloud cavitation, which clarified the collapse and rebound process of cavitation bubble. Finally, visualization of discharged jet from the nozzle under different cavitation regimes prove that wavy structure of the jet’s interface also becomes finer in accordance with cavitation growth in the nozzle.