@article{oai:nagasaki-u.repo.nii.ac.jp:00010009,
 author = {多田, 武夫 and 西ノ首, 英之 and 中才, 啓},
 journal = {長崎大学水産学部研究報告, Bulletin of the Faculty of Fisheries, Nagasaki University},
 month = {Feb},
 note = {It is considered indispensable to measure the flow speed in the course of experiment of fishing gear models in the circulating water tank. Especially, it is considered necessary to measure it with a high accuracy because the resistance of fishing gear models against stream is in direct proportion to the square of flow speed. Moreover the stream must not be disturbed by the setting of measuring apparatus, and therefore it is considered that the apparatus must be as small as possible. Hereupon, the authors manufactured on trial basis a small and handy but hypersensitive flow measuring device using strain gauge. Four resistors that are different in shape each other were manufactured as the flow measuring devices of strain gauge type, and their drag coefficient was also obtained. It was confirmed that they are readily reproducible and are accurate enough for practical usage with the accuracy within ±2cm/sec in the flow speed range of 5-60cm/sec., 回流水槽実験用の小型高感度流速計としてひずみゲージ式流速変換器を試作しその特性精度および実用性について次の知見を得た。1) 厚さ0.5m/mのばね板両面にひずみゲージを張りつけ流速変換器とした。荷重に対するこのばね板のひずみ出力応答特性は非直線性0.01%(15g F.S.)以内,ヒステリシス誤差は0.1%F.S.と予想以上の高精度特性が得られた。また約6ヶ月間にわたる再現性テストも良好であった。2) ばね板のみの流水抵抗は面積が小さいため小さく,記録器の誤差等が加わり,流速測定誤差の増大をまねく。そこで流水抵抗を増大させ測定誤差を小さくするために,ばね板先端に4種類の抵抗体を取り付け抵抗体の抗力係数を実験的に求め,流速変換器の精度を検討した。その結果,試作流速計の誤差は流速15～60cm/secの範囲で±3cm/sec以内であった。なお各種抵抗体の抗力係数はレイノルズ数2.5×10+3～15.0×10+3範囲でほぼ一定であった。3) ばね板の前面に円錐台型の抵抗体を装着すれば,流速変換器としての感度は高く整流性もよく精度は良い。, 長崎大学水産学部研究報告, v.42, pp.39-43; 1977},
 pages = {39--43},
 title = {漁具模型の回流水槽実験用流速計について},
 volume = {42},
 year = {1977}
}