侧壁角对梯形琴键堰泄流能力的影响

梯形琴键堰(T.P.K堰)是琴键堰(P.K堰)的进一步发展,具有泄流能力强、受地形限制影响小等优点。为了研究不同侧壁角对T.P.K堰泄流能力的影响,采用RNG k-ε湍流模型VOF法追踪自由表面,对5种不同侧壁角的堰型进行三维数值模拟。结果表明:α＜0°对T.P.K堰的泄流能力产生不利影响;随着侧壁角的增大,泄流能力得到了提升,当α=9°时,泄流量不再提高。利用数值模拟的优点,分别对T.P.K堰不同溢流前缘的泄流能力进行研究,并且揭示了侧壁角对泄流能力的内在影响机理。

Influence of Sidewall Angle on Discharge Capacity of Trapezoidal Key Weir

As the further development of piano key weir,trapezoidal piano key (TPK) weir is of strong discharge capacity and is slightly influenced by terrain.To study the effect of different sidewall angles on the discharge capacity of trapezoidal key weir,RNG k-ε turbulence model and VOF method was used to simulate the free surface of weirs with five different sidewall angles.Results show that α< 0° has a negative effect on the discharge capacity of TPK weir.The increase of sidewall angle enhances the discharge capacity.When α=9°,the discharge capacity is no longer improved.In addition,the discharge capacity of different overflow fronts was analyzed via numerical simulation,and the internal influence mechanism of sidewall angle on the discharge capacity was revealed.