Abstract: By studying and analysing the results of model tests, the related factors which have effects on single-port resistance coefficient are obtained.By conducting extensive hydraulic model tests to investigate the resistance coefficient of lock single-port under filling operation, the relationship between single-port resistance coefficient and its related factors(geometric parameter h_p/b, r/b, and H/b), culvert-to-port velocity ratio(v₁/v₃) and reynolds number of port-culver flow is studied, and empirical formulas for single-port resistance coefficient ξ₃ and also tributary loss coefficient are derived.

Key words: resistance coefficient, single port, velocity ratio, tributary, loss coefficient

摘要： 通过研究分析,得到了影响单支孔阻力系数的有关参数.经物理模型系列试验,得出了在充水情况下,单支孔阻力系数ξ₃与支孔几何参数h_p/b,γ/b,H/b;流速比v₁/v₃和支孔、廊道雷诺数之间的关系.从而提出计算支孔阻力系数ξ₃及分流损失系数ξ_w的经验公式.

关键词: 阻力系数, 单支孔, 流速比, 分流损失系数