非定常大涡模拟下混流泵叶轮的轴向力研究

发布时间：2018-07-29 09:25

【摘要】：为研究导叶式混流泵的轴向力,建立了导叶式混流泵内全三维流道模型,基于非定常大涡模拟亚格子尺度模型与滑移网格技术,对不同工况下的混流泵进行了数值模拟和性能预测,并将非定常方法计算值、定常方法计算值、经验公式估计值与试验值进行比较分析。结果表明:非定常方法计算得到的叶轮轴向力变化规律与试验和经验公式计算得到的轴向力变化规律更接近;在设计工况附近,定常和非定常方法计算得到的混流泵叶轮轴向力的数值与试验值的相对误差均约为10%;在小流量及大流量工况下,定常方法的计算值与试验值的相对误差约为30%,非定常方法的计算值与试验值的相对误差在10%之内。因此,非定常模拟方法可以更准确地预测混流泵的轴向力。
[Abstract]:In order to study the axial force of the guide blade mixed flow pump, a full three-dimensional flow channel model in the guide blade mixed flow pump is established. Based on the unsteady large eddy simulation subgrid scale model and slip grid technology, the numerical simulation and performance prediction of the mixed flow pump under different conditions are carried out. The calculation values of the unsteady square method, the calculated value of the constant method and the empirical formula are estimated. The results show that the axial force variation of the impeller calculated by the unsteady method is closer to that of the experimental and empirical formula, and the relative error of the axial force between the impeller and the experimental value calculated by the constant and the unsteady methods is calculated near the design conditions. It is about 10%, and the relative error between the calculated value of the constant method and the test value is about 30% under the small flow and the large flow condition, and the relative error between the calculated value of the unsteady method and the test value is within 10%. Therefore, the unsteady simulation method can predict the axial force of the mixed flow pump more accurately.
【作者单位】：西安科技大学;
【基金】：国家自然科学基金项目(11372245) 陕西省自然科学基金项目(2014JM1015) 西安科技大学培育基金(201632)
【分类号】：TH313

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