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泵站进水流道的临界淹深是影响泵站土建投资、主泵运行稳定性的重要因素,而临界淹深又是与流道进口形状、进口流速等有关的影响因素复杂的参数。迄今为止,尚不能用理论方法进行精确的分析,一般都依赖于模型试验。规范根据试验结果要求原型淹深为进水前池最低工作水位以下至少0.5m,但近期的一些试验报告要求淹深至少1.5～2.5m,随着主泵叶轮直径的增加甚至更大.为减少土建投资、优化设计,则应经济合理地确定淹深,因此有必要从理论上和试验上进行一系列的分析研究。一、进口淹深模拟试验的相似准则进水流道的进口为有压管流与明渠水流的交界面,要准确地模拟进口临界淹深,首先
The critical submergence of inlet runner of pumping station is an important factor that affects the civil engineering investment of pump station and the stability of main pump operation. Critical submergence is also a complicated parameter of influencing factors such as inlet shape and inlet velocity of flow passage. So far, the exact analysis can not be done by theoretical methods and generally rely on model tests. The specification requires that prototype flooding be at least 0.5 m below the minimum working water level in the pre-inflow pool according to the test results, but some recent trial reports require submergence of at least 1.5-2.5 m, even greater as the diameter of the main pump impeller increases Therefore, it is necessary to conduct a series of analysis and research in theory and experiment. I. Similar Criteria for In-Depth Submerged Simulation Test The inlet of the inflow channel is the interface between the pipe flow and the open channel flow. To accurately simulate the critical submergence of imports, firstly