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Taku Iwase,Tetsushi Kishitani,Masato Furukawa 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.4
Flow fields in 2-blade and 4-blade half-ducted propeller fans for the outdoor units of air-conditioners were calculated with large eddy simulation based on finite element method with the aim of investigating the influence of blade number on aerodynamic noise. We confirmed that the tip vortex had a great influence on aerodynamic noise in half-ducted propeller fans. The length of the tip vortex trajectory and the blade pitch for the 2-blade propeller fan were longer than those for the 4-blade propeller fan. These were suppressed the interaction between the tip vortex and the adjacent blade in the 2-blade propeller fan. The 2-blade propeller fan was therefore more silent than the 4-blade propeller fan.
Taku Iwase,Hideshi Obara,Yoshinobu Yamade,Chisachi Kato 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
In this study we calculated flow fields and aerodynamic noise in centrifugal fan of air conditioner by large eddy simulation (LES). The numerical simulation code employed throughout the LES was FrontFlow/blue (FFB). We compared calculation results for 10 million grids (10M-grid), 60 million grids (60M-grid) and 500 million grids (500M-grid) to investigate the influence of grid resolution on the prediction accuracy. The prediction accuracy of the aerodynamic noise by the 500M-grid was improved compared to the 10M-grid and 60M-grid calculation results. The grid resolutions between the shroud and the bell mouth and between one blade and an adjacent blade were important. Moreover, we found the proper capturing of the streaks contributed to better prediction.
Iwase, Taku,Kishitani, Tetsushi,Furukawa, Masato Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.4
Flow fields in 2-blade and 4-blade half-ducted propeller fans for the outdoor units of air-conditioners were calculated with large eddy simulation based on finite element method with the aim of investigating the influence of blade number on aerodynamic noise. We confirmed that the tip vortex had a great influence on aerodynamic noise in half-ducted propeller fans. The length of the tip vortex trajectory and the blade pitch for the 2-blade propeller fan were longer than those for the 4-blade propeller fan. These were suppressed the interaction between the tip vortex and the adjacent blade in the 2-blade propeller fan.The 2-blade propeller fan was therefore more silent than the 4-blade propeller fan.
Okamura, Takehiko,Ando, Ryosuke,Akita, Hidetoshi,Hashimoto, Yoshihiro,Iwase, Yutaka,Naiki, Taku,Kawai, Noriyasu,Tozawa, Keiichi,Kohri, Kenjiro Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.9
Objective: The guidelines on indications for prophylactic use of Bacille Calmette-Gu$\acute{e}$rin (BCG) against non-muscle-invasive bladder cancer (NMIBC) have changed over the years. In order to assess the impact on outcome, the present retrospective comparison of BCG efficacy by time period with Japanese patients was conducted. Patients and Methods: A total of 146 cases of NMIBC treated with BCG since February 1985 were retrospectively evaluated. All patients received 80 mg of BCG (Tokyo 172 strain) six to eight times a week for prophylactic use. Comparison was made among three historical groups (Group A: 1980's, 39 cases; Group B: 1990's, 61 cases; Group C: 2000's, 46 cases). Results: In total, recurrence was seen in 55 of the 146 cases (37.7%), and progression in 14 (9.6%), 1 patient dying of cancer. These overall results were similar to those outlined in previous reports. However, the outcomes of this time-period-based analysis indicated a tendency for a shorter time to recurrence in patients after 2000, although a log-rank test showed no significance (P=0.229). Seven of the cases featuring progression (i.e., half of all such cases) were among the 46 Group C patients (15.2%). Excluding these progressive cases, there was no significant difference among the remaining 132 patients in the three groups. Conclusion: This study results revealed a tendency for a lower non-recurrence rate after 2000 in our series. This could stem from a number of factors, including changes in BCG indication criteria and the evolution of histopathological diagnostic criteria.