Abstract
In this paper, we propose a new drainpipe with vortex chamber in order to free from danger of engulfing human body in the drain port of swimming pool, and show the basic flow properties of the drainpipe. The proposed drainpipe can control the suction force with the working of vortex flow. The drainpipe is constructed with thin vortex chamber, two tangential nozzles and one axial nozzle. The two tangential nozzles are connected with the two drain ports in the pool, and the axial nozzle is joined to discharge pipe. If the human body is sucked into the drain port, the vortex flow is generated in the vortex chamber. And then, the vortex flow restricts the flow rate. As the result, the suction force is reduced to safety range. In this system, it is worthy of note that the control action is performed with water flow itself without any mechanical equipment. In this study, the suction force and flow properties of the drainpipe were analyzed experimentally. As the results, it was evident that the suction force of the drainpipe is reduced drastically. In addition to that, the flow resistance of the drainpipe was smaller than the value of usual drainpipe.
