中文摘要：

结合圆柱绕流原理，提出带尾翼的新型圆柱形量水槽，以减少水头损失、提高测量精度。根据临界流原理推导得出了梯形渠道圆柱形（带尾翼）量水槽计算公式，通过试验分析得到了梯形渠道不同收缩比、不同尾翼长度的圆柱形童水槽的水位一流量关系。结果表明，增加尾翼能够有效减小上下游水位差及改善过槽水流流态；当量水槽收缩比为0．5～O．65，尾翼长度为L—D～3D／2范围时，测流精度高且水头损失较小。

英文摘要：

A new kind of cylindrical measuring flume with empennage was put forward to reduce head loss and improve the measurement accuracy based on the principle of flow around a cylinder. A new computa- tional formula of cylindrical measuring flume in trapezoidal channel was deduced and the relationship was analyzed between the water level and flow in cylindrical measuring flume with different shrinkage ratios and empennages with different lengths. The results showed that adding the tail could effectively reduce the difference of water levels between upstream and downstream and improve the flow pattern of the measuring flume; When the flume section shrinkage ratio ranged from 0.5 to 0.65 and the length of the tail ranged from D to 3D/2,the measurement accuracy of flow was high and the head loss was small.