牛枠工の抵抗特性と乱流に関する実験的研究
キーワード:
Seigyu,
flow behavior,
turbulence intensity,
Reynolds stress,
drag force coefficient,
roughness coefficient,
wake
2003 年 9 巻 p. 191-196
詳細
2003 年 9 巻 p. 191-196
The objective of this study is to elaborate assessment method of Seigyu’s resistance on a stream and research the resistance characteristics by means of hydraulic model experimental. In the experiment, Seigyu groins ware set at the confluence of a river and at a curve.
The results show that a Seigyu shifts the direction of flow. The distribution of turbulence intensity also shows that the streams were bounded by Seigyu. A Seigyu can control a stream, but lower discharge capacity because placement of a Seigyu narrows cross sectional area. Drag coefficient CD, an index of resistance characteristics of Seigyu groins, amount to nearly 1,the same as that for a cylinder. Roughness coefficient n is 1.5 or 1.75 times that found when Seigyu groin are not provided. Further, we compared measured values with calculated values from deficient velocity at the back of Seigyu groins. The deficient velocity is based on calculating method in the wake that be concerned free turbulence.
