弧形闸门前漩涡影响因素研究

发布时间：2018-07-02 22:53

  本文选题：弧形闸门 + 吸气漩涡　； 参考：《水利水电技术》2017年11期

【摘要】：为研究弧形闸门局部开启时引起闸门前发生的吸气漩涡影响因素,取某泄洪闸的其中一孔为研究对象,采用比尺为1∶20的水工模型进行了相关试验研究和理论分析。研究结果表明,闸前吸气漩涡的产生与闸前水深、闸门开度、来流环量以及表面张力和黏性力有关。通过试验观测和理论分析得到,闸前漩涡存在上、下两个临界淹没水深。当闸前水深在临界淹没水深上下限之间时有吸气漩涡发生。弧形闸门局部开启时,开度越大,闸门进水口的宽高比越小,吸气漩涡越强;来流的边界条件引进的环量作用越明显,漩涡越强;当雷诺数Re≥4.4×10~4,韦伯数We≥(104~208)时,可以忽略黏性力和表面张力对试验的影响。最后,通过理论分析建立了只考虑闸门进水口的宽高比和环量数的临界淹没水深公式。
[Abstract]:In order to study the influence factors of suction vortex in front of the gate caused by the partial opening of an arc gate, a hydraulic model with a specific scale of 1:20 was used to carry out the relevant experimental study and theoretical analysis with one of the holes of a flood sluice as the research object. The results show that the generation of suction vortex in front of the sluice is related to the depth of water in front of the gate, the opening of the gate, the amount of the incoming flow ring, the surface tension and the viscosity force. Through experimental observation and theoretical analysis, it is found that there are two critical submerged water depths in front of sluice. When the water depth in front of the sluice is between the upper and lower limits of the critical submerged water depth, a suction vortex occurs. When the radial gate opens locally, the larger the opening degree is, the smaller the ratio of width to height of the gate inlet is, and the stronger the suction swirl is, the more obvious the effect of the ring quantity introduced by the boundary condition of the incoming flow is, the stronger the swirl is, when re 鈮，

本文编号：2091211