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首页> 外文期刊>Journal of Hydraulic Engineering >Initiation of Stagnation in Drinking Water Storage Tanks
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Initiation of Stagnation in Drinking Water Storage Tanks

机译：饮用水储水罐中的停滞现象

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Using temperature as a conservative tracer, the initiation of stagnation by buoyant jets was investigated in two drinking water storage tanks operated in fill-and-draw mode. The problem concerns the risk of water quality degradation caused by excessive ageing in stagnant zones. By measuring flow rates into the tanks and temperatures at several points, the initiation of stagnation could be related to the source parameters: the momentum flux M_0 and the buoyancy flux B_0. In agreement with previous studies, the results indicated that the jet/plume transition length scale, L_m = M_0~(3/4)/|B_0| ~(1/2), had to exceed a certain fraction of the depth in order to avoid stagnation resulting from stratification of the water mass. The study provides insights into the parameters governing initiation of stagnation and illustrates how stratifications generated by positive and negative inflow buoyancy can affect the water exchange.
机译：使用温度作为保守的示踪剂，在两个以充水和抽水方式运行的饮用水储罐中，研究了浮力喷射引起的停滞现象。问题涉及停滞区域过度老化导致水质下降的风险。通过测量流入储罐的流量和几个点的温度，停滞的开始可能与源参数有关：动量通量M_0和浮力通量B_0。与先前的研究结果一致，结果表明射流/浮质过渡长度尺度L_m = M_0〜（3/4）/ | B_0 |。 〜（1/2），必须超过一定深度的一部分，以避免因水团分层而停滞。该研究提供了有关控制停滞起始的参数的见解，并说明了由正向和负向流入浮力产生的分层如何影响水交换。

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