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为了尽可能减小洞塞消能工对过流能力的影响,提出了一种齿墩式内消能工法,通过物理模型试验对不同收缩比的齿墩式内消能工进行了研究,分析了它们的过流能力、消能率及局部水头损失系数。结果表明,齿墩尺寸和形状是影响齿墩式消能工的关键因素,其面积收缩比越小,消能率越高,过流能力就越低;各方案的时均压强在进口处迅速递减,在距齿墩段进口1.15 D左右达到最小值,而后逐渐恢复,在距进口4.00 D处趋于平稳;当收缩比逐渐增大,局部阻力损失系数逐渐减小。
In order to minimize the influence of the plug dissipater on the overcurrent capability, a tooth decay internal energy dissipating method was proposed. The physico-model tests were carried out to analyze the internal energy dissipators with different shrinkage ratios. Their overcurrent capacity, energy dissipation rate and local head loss coefficient. The results show that the size and shape of the tooth piers are the key factors affecting the tooth-piers energy dissipater. The smaller the area shrinkage ratio is, the higher the energy dissipation rate is and the lower the overcurrent capacity is. The average pressure at each program decreases rapidly at the entrance , Reaching a minimum around 1.15 D at the entrance to the tooth section, then recovered gradually and stabilized at a distance of 4.00 D from the inlet. As the shrinkage ratio gradually increased, the local drag loss coefficient gradually decreased.