导叶与隔舌相对位置对离心泵叶轮径向力的影响

发布时间：2018-09-11 18:07

【摘要】：采用SST模型对不同导叶与隔舌相对位置下的离心泵进行非定常数值模拟,并通过试验验证,其试验与模拟的效率与扬程误差均在5%以内。分析表明:当导叶叶片与蜗壳隔舌安装角度α为25°时,在各个流量工况下,其扬程与效率均高于其他安装位置,当α为5°时,其效率与扬程最小;当流量Q为24、32 m3/h时,最大与最小效率差值分别为1%、1.4%,流量Q为40、48、56 m3/h时,其差值分别为2.2%、2.4%、4.5%;叶轮出口圆周速度随着时间步的不同而改变,导致作用于叶轮上径向力矢量呈现出较不规则的分布;导叶与隔舌不同相对位置对径向力的影响主要在于其对叶轮出口圆周方向静压的影响,从而导致出口静压不对称,进而影响叶轮径向力;当α为41°和25°时,叶轮出口圆周方向静压对称性明显好于其他相对位置,且其径向力小于α为5°和59°时径向力。
[Abstract]:The unsteady numerical simulation of centrifugal pump with different relative position of guide vane and tongue is carried out by using SST model, and the experimental results show that the efficiency and the lift error of the test and simulation are less than 5%. The analysis shows that when the mounting angle of guide vane and volute is 25 掳, its lift and efficiency are higher than those of other installation positions under each flow condition, and when 伪 is 5 掳, its efficiency and lift are the least, and when Q is 244m ~ 3 / h, The maximum and minimum efficiency differences are 1 / 1.4, Q = 404856 / m ~ (3 / h), respectively, and the difference is 2.2and 2.4cm / h, respectively. The circumference velocity of the impeller outlet varies with the time step, which results in the irregular distribution of the radial force vector acting on the impeller. The influence of different relative position of guide vane and tongue on radial force mainly lies in its influence on the circumferential static pressure at the outlet of impeller, which leads to the asymmetry of outlet static pressure, and then affects the radial force of impeller when 伪 is 41 掳and 25 掳. The symmetry of hydrostatic pressure in the circumferential direction of impeller outlet is obviously better than that in other relative positions, and the radial force is less than 5 掳and 59 掳when the radial force is less than 5 掳and 59 掳.
【作者单位】：西安交通大学热流科学与工程教育部重点实验室;
【基金】：国家自然科学基金项目(51076126)
【分类号】：TH311

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