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Newsletter  2019.3  Index

Theme : "The Conference of Fluid Engineering Division"

  1. Preface
  2. Development and launch of sounding rockets and development status of small launch vehicle by Japanese startup company
    Takahiro INAGAWA (Interstellar Technologies Inc.)
  3. Experimental quantification of friction drag reduction effects on an airfoil using uniform blowing
    Kaoruko ETO, Yusuke KONDO, Koji FUKAGATA (Keio University)and Naoko TOKUGAWA (Japan Aerospace Exploration Agency)
  4. Wind-tunnel experiments of friction drag reduction on an airfoil using passive blowing
    Shiho HIROKAWA, Kaoruko ETO, Yusuke KONDO, Koji FUKAGATA (Keio University)and Naoko 
    TOKUGAWA (Japan Aerospace Exploration Agency)
  5. A Study on Airfoil Flow and Aerodynamic Noise with Wake-boundary layer Interaction
    Noriaki KOBAYASHI (The University of Tokyo)
  6. LES Analysis of Stator Cascade Flow in a Transonic Axial Compressor
    Seishiro SAITO (Kyushu University)
  7. Influence of grid resolution in large-eddy simulation of a turbulent pipe flow using the WALE model
    Daiki IWASA, Yusuke NABAE, Koji FUKAGATA (Keio University)
  8. The Dreams of Flow Contest
    Tomomi TERADA (Hokkaido University)  
  9. Separation of floating waste by "Water Surface Control Device"
    Toshiki HOMMA  (Meisei University)


The Dreams of Flow Contest

Hokkaido University


We three, the group “Kikaichi♥” consists of third-year undergraduates of Hokkaido University, participated in the JSME 16th Dreams of Flow Contest held in Muroran, Hokkaido. We all are belong to the Department of Mechanical and Intelligent System Engineering and took a lecture of fluid dynamics. The contest was a chance to try our preliminary, but wide knowledge acquired in the lectures on mechanical engineering during last two years. The theme of the contest, “Active Control of Flow” suffered us so much because this was the first experience to proceed research by ourselves. We attempted to construct a model of a novel smoking room, “Kemumoji-kun”(Fig.1), which attracts smokers with its fascinating devices toward peaceful separate smokers from non-smokers. The model (Fig. 2), we finally constructed, possesses two floors (150 × 300 × 400 mm3) and is able to discharge smoke filling the smoking room with two fluid engineering techniques; thermal convection and air vibration. The former (Fig. 3) creates an upward flow using a lubber heater, and smoky air filling the first floor follows the flow and enters the second floor. The latter (Fig. 4) directly discharge incoming smoky air to outside as vortex rings with using air vibration generated by sound. At the contest, we demonstrated various sounds performed by a smartphone, musical instruments, human voice via a microphone, and so on. Throughout innumerable trials and errors, we finally won the first prize of the contest.

Key words

convection, vibration, vortex ring


Fig.1 “Kemumoji-kun”

Fig.2 Conceptual image of “Kemumoji-kun”

Fig3. Thermal Convection

Fig4. Air Vibration

Last Update:3.20.2019