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在对消能机理较深认识基础上提出了一种既有高消能率,又能明显减小消力池底板冲击压力及临底流速的新型消力池布置形式,它明显不同于底流消能.这种新的布置形式有较高消能率的原因是人为制造了更多的剪切消能区;能明显减小消力池底板冲击压力及临底流速的原因是在合理的体形下,能保证入池水流以近似水平的方向,以射流的形式在消力池内运动,避免了高速水流直接冲刷消力池底板.通过大量的模型试验研究后发现,水平方向窄而垂直方向厚的入射水流适应水位变化的稳定性较好,能始终保持水平淹没射流状态,宽而扁的水舌适应水位变化的稳定性较差,容易随下游水位的升高或降低而潜底或上漂.采用数值模拟的方法对这种新型消力池的水力特性进行了较为深入的研究,消力池水面线、临底流速以及底板压力等的计算结果与试验结果符合较好,结合模型试验及数值模拟,对这种消力池的流态进行了较为详细的分析研究,得到了不同情况下比较详细的流场特性,与实验现象极为吻合.
Based on a deeper understanding of the energy dissipation mechanism, a new type of arrangement of the stilling basin with both high energy dissipation rate and striking reduction of the impact pressure and the bottom flow rate of the stilling pool floor is proposed. It is obviously different from that of the underflow energy dissipation The reason that this new arrangement has a higher energy dissipation rate is that man-made more shear energy dissipation zones; the reason that the impact pressure and the bottom flow velocity of the bottom of the stilling pool can be significantly reduced is that under reasonable shape, Can ensure that the inflow of water into the pool in the direction of the level of the jet in the form of movement in the pool, to avoid high-speed flow directly flushing the bottom of the pool.Through a large number of model test study found that the horizontal direction of the narrow and vertical incidence Water flow to adapt to changes in the stability of the water level is better, can always maintain the level of submerged jet state, wide and flat water tongue to adapt to changes in the stability of the water is poor, easy to rise or lower with the downstream water level at the bottom or drift. The numerical simulation method is used to study the hydraulic characteristics of this new type of stilling pool. The calculation results of the surface water level, the bottom flow rate and the pressure in the bottom of the stilling basin are in good agreement with the experimental results. Experimental and numerical simulation of flow pattern such stilling a more detailed analysis of the obtained under different circumstances a more detailed flow field, very consistent with experiments.