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円管内の気流に関する研究 STUDIES ON THE AIR CURRENT THROUGH THE CIRCULAR PIPES : About the effect of the shape and the high speed of columns 川畑, 早苗 KAWABATA, Sanae 米倉, 豊彦 YONEKURA, Toyohiko open access For the purpose of investigating the air flow when a train runs into a tunnel, the authors of this paper simplified the problem as stated in the former report and investigated the air velocity in the inlet and outlet of the pipe by moving short columns into the horizontal pipes. Hara has studied about the air pressure when the train runs into the tunnel in case of changing the top shapes of the train, but nothing seems to be investigated about the air velocity. Then, in the present paper, we report about the air velocity in case of changing the shape of the top and back of the columns. On the other hand, we state about the air velocity in case of the high speed of the column corresponding to that of the train. 鹿児島大学 Kagoshima University 1972-09 jpn departmental bulletin paper VoR http://hdl.handle.net/10232/12794 https://ir.kagoshima-u.ac.jp/records/2272 0451212X AN00040363 鹿児島大学工学部研究報告 The research reports of the Faculty of Engineering, Kagoshima University 14 1 5 https://ir.kagoshima-u.ac.jp/record/2272/files/AN00040363_v14_p1-5.pdf application/pdf 6.6 MB 2016-10-27 1972-09