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为研究三堡排涝泵站斜式轴流泵装置模型的飞逸特性,该文对其进行了飞逸特性试验,研究了不同叶片角度下泵装置模型的单位飞逸转速及其变化规律。试验结果表明,随叶片角度的增大,单位飞逸转速呈下降趋势。为深入了解飞逸工况时泵内部流场特征,基于非定常的数值计算方法,采用滤波器湍流模型,利用ANSYS CFX软件对泵装置模型进行数值计算,求得不同叶片角度下的单位飞逸转速,并对其内部流场进行分析。数值结果表明,飞逸工况时的流量值和单位飞逸转速与试验结果均较为接近,从而验证了数值方法的可靠性。通过对飞逸工况时叶轮内部流场进行分析发现,流体从叶轮尾部流向头部,流场较为光顺,没有出现明显的回流和旋涡;叶片表面压力分布情况与文献[6]中叶片表面压力的分布规律相近,并随叶片角度的增大,叶片吸力面侧和压力面侧的低压区域均呈逐渐增大的变化规律。
In order to study the runaway characteristics of the inclined axial flow pump device model of Sanbao drainage pump station, this paper carried out the runaway test and studied the unit runaway speed and its variation under different blade angles. The experimental results show that with the increase of blade angle, unit runaway speed decreases. In order to get a better understanding of the internal flow field characteristics of the pump during the runaway condition, based on the unsteady numerical calculation method, the filter turbulence model was used to calculate the pump unit model with ANSYS CFX software, Speed, and its internal flow field analysis. The numerical results show that the flow rate and unit runaway speed at the run-off condition are close to the test results, which verifies the reliability of the numerical method. By analyzing the flow field inside the impeller during the runaway condition, it is found that the flow from the tip of the impeller to the head has a smooth flow field and no obvious backflow and vortex. The pressure distribution on the blade surface is similar to that of the blade surface The distribution of pressure is similar, and with the increase of the blade angle, the variation pattern of the pressure on the suction side and the pressure side of the blade shows an increasing rule.