第四部門：流体力学（A）

[S04A-07] Drainage faculty of pipe flows governed by formation of local flow in manhole

*Youichi Yasuda¹, Tetsuta Murano² (1. Nihon University, College of Science and Technology, Dept. of Civil Engineering, 2. Nihon University, Graduate School of Science and Technology, Dept. of Civil Engineering)

Keywords:Local Flow, Drainage Facility, Discharge Coefficient, Pressure Control, Manhole

Experimental investigation on hydraulics in pipe flows connected to manhole yields that the formation of local flow in manhole is significant for the drainage faculty. The installation of a drop between inlet and outlet pipes connected to manhole and the pressure control in manhole were conducted in the connection with angle of 90, 120, 150, and 180 degrees between inflow and outlet pipes at manhole. In accordance with several conditions, the discharge coefficient for inlet pipe flow shows 1.2 under the condition of 120 degree and 470 ^o/_oo slope.