水轮机过流部件出水边夹角对卡门涡频率的影响

发布时间：2018-09-07 08:55

【摘要】：利用数值模拟方法,模拟具有相同出水边厚度、不同出水边夹角的一组水轮机过流部件下游侧的卡门涡现象,研究出水边夹角对卡门涡频率的影响,结果表明,随着出水边夹角的增加,卡门涡频率逐渐降低;当出水边夹角增加到30°时,卡门涡频率模拟值大约降低到圆柱绕流卡门涡频率理论公式计算值的1/3。通过对数值模拟结果和理论公式计算值进行对比分析以及数据处理,获得斯特劳哈尔数与过流部件出水边夹角的关系曲线和近似的直线拟合公式。以某水轮机固定导叶出水边卡门涡振动测试数据为基础,对比验证水轮机过流部件卡门涡数值模拟方法的准确性,以及获得的斯特劳哈尔数取值计算公式的准确性。研究结果对合理设计水轮机过流部件出水边形状、避免发生卡门涡共振问题具有较高的指导意义和参考价值。
[Abstract]:By using the numerical simulation method, a group of hydraulic turbine downstream vortex phenomena with the same outlet edge thickness and different outlet edge angles are simulated, and the influence of the water edge angle on the frequency of the Carmen vortex is studied. With the increase of the angle of the outlet edge, the frequency of the Carmen vortex decreases gradually, and when the angle of the outlet edge increases to 30 掳, the simulated value of the frequency of the Carmen vortex decreases to about 1 / 3 of the calculated value of the theoretical formula of the Karman vortex around the cylinder. By comparing the results of numerical simulation with the calculated values of theoretical formula and data processing, the relation curve and approximate straight line fitting formula between Strauwhall number and outlet angle of overflowing components are obtained. Based on the measured data of the Carmen vortex vibration along the outlet edge of the fixed guide vane of a hydraulic turbine, the accuracy of the numerical simulation method for the Carmen vortices of the turbine's overflowing parts and the accuracy of the calculated formula for the Strohal number are compared and verified. The results of the study are of great significance and reference value for the reasonable design of the outlet edge shape of the turbine overflowing parts and the avoidance of the Carmen vortex resonance problem.
【作者单位】：哈尔滨大电机研究所水力发电设备国家重点实验室;
【分类号】：TK730.2

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