突缩突扩式管道消能工能量损失特性研究

Research on Energy Dissipation Characteristics of Sudden Reduction and Sudden Enlargement Energy Dissipater

为明确突缩突扩式消能工能量损失系数与相关影响因素之间的关系,通过数值模拟试验,分析了孔径比、厚径比、雷诺数等因素对能量损失系数的影响。结果表明,孔径比越小,能量损失系数越大;当孔径比超过0.7时,孔径比对能量损失系数的影响不再明显;能量损失系数随厚径比的增大而减小,但当厚径比超过0.5时,能量损失系数随厚径比的增大而减小的趋势变得不明显;当雷诺数大于10~5时,雷诺数对能量损失系数的影响可忽略。

In order to clarify the relationship between energy loss coefficient of sudden reduction and sudden enlargement energy dissipater and influencing factors,the impacts of contraction ratio,ratio between energy dissipater thickness and discharge tunnel＇s diameter,Reynolds number on energy loss coefficient were analyzed by numerical simulation test.The results show that energy loss coefficient increases with contraction ratio decreases;when contraction ratio is greater than 0.7,its impacts on energy loss coefficient are not obvious;energy loss coefficient decreases with the increase of ratio between energy dissipater＇s thickness and discharge tunnel diameter;when the ratio between energy dissipater＇s thickness and discharge tunnel diameter is greater than 0.5,its impacts on energy loss coefficient are not obvious;when Reynolds number is greater than 10-5,its impact on energy loss coefficient can be ignored.