考虑偏转角度的钢筋石笼起动流速与拖曳力系数研究  

Research on the Critical Velocity and Drag Coefficient of Reinforced Gabion Considering the Deflection Angle

作　　者：朱文帅 吴浩 徐杭杭 赵跃章 刘仲秋[1] 李全起[1] ZHU Wen-shuai;WU Hao;XÜHang-hang;ZHAO Yue-zhang;LIU Zhong-qiu;LI Quan-qi(College of Water Conservancy and Civil Engineering,Shandong Agricultural University,Taian 271018,Shandong Province,China;Shandong Longyuexing Design Group Co.,Ltd,Jinan 250014,Shandong Province,China)

机构地区：[1]山东农业大学水利土木工程学院,山东泰安271018 [2]山东龙跃兴设计集团有限公司,济南250014

出　　处：《中国农村水利水电》2021年第9期32-37,共6页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(31571603)。

摘　　要：分析了钢筋石笼稳定特性的研究现状,发现现有研究对考虑偏转角度情况下的钢筋石笼的稳定特性的研究较少。针对其不足之处,经受力分析及推导,提出了一种待定拖曳力系数CD的考虑偏转角度的钢筋石笼起动流速计算公式,在此基础上开展了a×a×a、a×a×c、a×b×c三种形状的钢筋石笼起动流速水槽试验和拖曳力系数试验,对考虑偏转角度和雷诺数双因素影响下的待定拖曳力系数进行了公式拟合。试验结果表明:钢筋石笼的偏转角度越大,起动流速越小;钢筋石笼的拖曳力系数处于0.55-0.84之间,拖曳力系数随偏转角度的增大呈先减小后增大的趋势,偏转角度为15°时,拖曳力系数取最小值;钢筋石笼的拖曳力系数随块体雷诺数的增大先增大后逐渐减小。对推导公式进行了试验验证,精度良好,可为钢筋石笼的起动流速计算及拖曳力系数取值提供理论参考。The current research status of the stability characteristics of reinforced gabions is analyzed,and it is found that there are few stud⁃ies on the stability characteristics of reinforced gabions considering the deflection angle.Considering its shortcomings,subjected to force analysis and derivation,a formula for calculating the critical velocity of the reinforced gabion considering the deflection angle with the unde⁃termined drag force coefficient CD is proposed.On this basis,a×a×a,a×a×c,a×b×c,three shapes of reinforced gabion critical veloc⁃ity flume experiment and drag force coefficient experiment,the undetermined drag force coefficient under the influence of deflection angle and Reynolds number is considered.The experimental results show that the larger the deflection angle of the reinforced gabion,the lower the critical velocity;the drag coefficient of the reinforced gabion is between 0.55 and 0.84,and the drag coefficient first decreases and then in⁃creases with the increase in the deflection angle.When the deflection angle is 15°,the drag coefficient takes the minimum value;the drag co⁃efficient of the reinforced gabion first increases and then gradually decreases with the increase of the block Reynolds number.The deduced formula has been verified experimentally,and accuracy is good,which can provide a theoretical reference for the calculation of the critical velocity of the reinforced gabion and the value of the drag coefficient.

关 键 词：起动流速 拖曳力系数 偏转角度 雷诺数 计算公式 

分 类 号：TV131[水利工程—水力学及河流动力学]