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Haruka Nishimura,Kazuyasu Sugiyama,Yoshinobu Tsujimoto,Hajime Koyama 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.3
The rotordynamic fluid forces on a columnar rotor modeling the front shroud of Francis turbine caused by the leakage flow and whirling motion are evaluated by the experiments and the computations, to explain the self-excited vibration observed in free vibration tests. In addition to the leakage flow models previously proposed, a new model is proposed to include the effects of the rotation and whirling motion of the rotor to evaluate the rotordynamic fluid forces. After checking the validity of the models by comparisons with experiments and CFD, the characters of each component are discussed based on the physical mechanism producing the forces. It was found that the rotordynamic force component normal to the whirling orbit is mainly caused by the centrifugal forces of the added mass of the fluid in the clearance and that the tangential force is mainly caused by the acceleration of the axial leakage flow through the clearance.
Magnetization Curves of TbZn2 in High Magnetic Fields
Yoshiya Adachi,Tetsuo Kitai,Keiichi Koyama,Hajime Yoshida,Takejiro Kaneko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetization of a single-crystalline sample of TbZn2 was measured under high magneticfields up to 180 kOe in the temperature range from 4.2 to 90 K. The metamagnetic transitionswere observed in the directions of all axes at temperatures below TN and along the c-axis attemperatures above TN. The metamagnetic transition field HM along the c-axis at temperaturesabove TN increases with increasing temperature.