CALCULATION FORMULA FOR ENERGY LOSS OF FOUR-WAY CIRCULAR MANHOLES CONSIDERING THE DROP HEIGHT OF THE LATERAL INFLOW PIPE

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  • 横流入管の落差を考慮した4方向接合円形マンホールのエネルギー損失の算定式

Abstract

<p> The authors have been devising formulas for calculating the energy loss coefficient in a four-way circular manhole where three inflow pipes and an outflow pipe are connected at a crossroads. On the first step, a formulation was performed under the condition that the flow rates of the two opposing lateral inflow pipes were the same, and then we devised a calculation formula that could calculate the energy loss coefficient even when the flow rates of all the inflow pipes were different. In this paper, we experimentally obtained the energy loss characteristics of the four-way circular manhole with a drop height on one of the lateral inflow pipes, and developed a new formula that can calculate the effect of the drop height of the lateral inflow pipe with the conventional formula. The calculated values of the energy loss coefficient with this formula can almost reproduce experimentally obtained values within the range of this experimental condition.</p>

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