突扩式消力池常见于多孔水闸和泵闸结合的水利枢纽,其水跃跃后水深的计算是一个无法回避的问题。由于突扩式水跃水流的复杂性,对其跃后水深的理论研究尚不成熟与完善。根据已有文献的试验资料,对前人常用研究方法所得的突扩式水跃跃后水深成果进行了定量分析与比较。结果表明,当边墙反力对应的压强水头等于跃前水深和跃后水深的平均值时,其计算的跃后水深与实际更加相符。通过建立绕流阻力新模型,结合已有文献的实测资料,给出了突扩式水跃绕流阻力系数的计算公式,提出了突扩式水跃跃后水深计算的新方法,并对其准确性和通用性进行了验证。
Abstract
Stilling basin with abrupt expansion has been commonly applied to hydro-junction of multi-outlet sluice and pump combined with sluice structure. The calculation of sequent water depth is an inevitable problem to be faced with. Due to the complexity of hydraulic jump in abruptly expanding stilling basin, theoretical study of sequent depth is not yet mature and perfect. According to the test data in some articles, the calculation results of sequent depth obtained in some previous researches are compared and analyzed in quantitative terms. Results suggest that the calculated sequent depth is consistent with the actual situation when pressure head is equal to the mean value of upstream supercritical flow depth and sequent depth. Furthermore, a new method for calculating sequent depth is put forward by giving the calculation formula of circumfluent resistance coefficient based on the model of circumfluent resistance. The correctness and availability of the proposed method is also verified.
关键词
突扩式水跃 /
边墙反力 /
跃后水深 /
压强水头 /
绕流阻力系数
Key words
abruptly expanding hydraulic jump /
side wall reaction forces /
sequent depth /
water head /
circumfluent resistance coefficient
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