| 摘要 |
<p>PROBLEM TO BE SOLVED: To generate a sliding flow on the surface of a columnar object, such as golf club shaft, which moves relatively in fluid and to decreases the fluid resistance, i.e., fluid friction resistance and pressure resistance, generated in the object by forming a groove for introducing the fluid moving along the surface on the surface of the object. SOLUTION: The groove M which allows the introduction of the fluid moving along the surface S of the columnar object, for example, the object B, such as golf club shaft or the suspension rope of a bridge, moving relatively in the fluid and rotates the fluid to the moving direction of the object B is formed on the surface S of the object B. According thereto, the fluid rotates in the flow direction (x) is the bottom of the groove M and, therefore, a back flow R is generated and the code of the primary gradient in the velocity component is made negative and the absolute value of the primary gradient in the region of the groove M decreases, as a result, of which the slip flow is induced on the surface of the object B. Then, the pressure in the base region on the downward end side of the object B is increased and the occurrence of the turbulence in the flow of the fluid on the downstream end side is substantially prevented and the pressure resistance is lowered.</p> |
