This paper presents an experimental study focusing on the effect of intake pipe blockage on the critical submergence of lateral dual square intakes under perpendicular uniform approach flow. The pipe blockage is implemented by various intake protrusions into the approach flow, with one of the intakes always kept flush with the channel sidewall. An increase in protrusion of downstream intake alone causes a significant decrease in critical submergence, and an increased protrusion of upstream intake alone causes higher critical submergence when both intakes operate under identical conditions. At higher protrusions of twice the intake size, the mutual influence between the intakes was negligible with multiple vortex formations at both intakes in dual configuration. Based on the results, an empirical equation is proposed for the computation of critical submergence for lateral dual protruded intakes and was found to be in good agreement with the experimental results, which will be useful in the design for fixing the invert level of dual intakes under approach flow condition. The flow blockage due to protrusion can be adopted effectively to reduce the critical submergence for multiple intake structures.

本文提出了一项实验研究，重点研究了垂直均匀流下进气管堵塞对横向双方形进气口临界淹没的影响。管道堵塞是通过进入引流的各种入口突出物来实现的，其中入口之一始终与通道侧壁保持齐平。当两个进水口在相同条件下运行时，单独增加下游进水口的突出量会导致临界浸没度显着降低，而单独增加上游进水口的突出量会导致更高的临界浸没度。在两倍入口尺寸的较高突出处，入口之间的相互影响可以忽略不计，在双配置中两个入口处形成多个涡流。根据结果​​，提出了计算侧向双突出进水口临界淹没度的经验方程，结果与实验结果吻合较好，为确定进流工况下双进水口反转水平的设计提供了参考。可以有效地利用突出物造成的流动阻塞来减少多个取水结构的临界淹没。