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当一个孤立突体的上游泄流面被加糙后,其顶部的绕流流速由于受上游加糙体的影响和遮掩作用而变小,孤立突体引起的压力降落值也减小,受上游糙体的影响程度不仅取决于其与糙体的间距而且与糙体的高度有关。这表明粗糙壁面确有减蚀作用。在明流反弧段均匀加糙后,可增大反弧末端不平整突体的临界限制高度(例如在100m工作水头条件下,突体临界限制高度从3mm可增大到20mm),可降低施工的控制标准。
When the upstream discharge surface of an isolated bump is roughened, the flow velocity at the top of the solitary bump becomes smaller due to the influence of the upstream roughening and the obscuring effect, and the pressure drop value caused by the solitary bump also decreases. The degree of influence of a rough body depends not only on its distance from the rough but also on the height of the rough. This shows that the rough wall does have a corrosion effect. Increasing the critical limit height of the non-flat protrusion at the end of the anti-arc (for example, under the condition of 100m working head, the limit height of the protrusion can be increased from 3mm to 20mm) can be reduced after the meandering reverse arc section is uniformly roughened. Construction control standards.