针对螺杆泵泄漏机理，利用数值模拟加数据拟合方法，提出了一种针对螺杆泵螺旋微小缝隙泄漏的双向流固耦合模拟方法。利用此方法，对比了单向流固耦合和双向流固耦合方法在螺杆泵泄漏计算结果的偏差，计算结果表明，间隙越小偏差越大，间隙为 0。500 mm 时两结果相差20。3%，说明螺杆泵这种刚柔配合螺旋缝隙泄漏必须利用双向流固耦合求解才能获得准确结果。随后利用双向流固耦合方法对三维螺杆泵模型进行有限元分析求解，研究了初始间隙、流体介质黏度、螺杆泵单级腔室压差、进出口压力对螺杆泵泄漏的影响。结果显示:泄漏量随初始间隙的增大而增大，随流体介质黏度的增大而减少;进出口压力变化对螺杆泵泄漏影响很小，可以忽略;腔室间的压差造成橡胶定子变形形成间隙，间隙随着压差增大呈线性增大。最后利用双向流固耦合方法计算了不同举升压力螺杆泵的容积效率，与试验结果对比误差在±5%以内。
Method of bidirectional fluid-structure interaction for spiral slit leakage
A bidirectional fluid-structure interaction simulation method for the leakage mechanism of spiral slit was proposed by using numerical simulation and data fitting method.Using this method,the deviations in the leakage calculation results of the progressing cavity pump(PCP)by the unidirectional fluid-structure interaction method and bidirectional fluid-structure interaction method were compared.The calculation results show that the smaller the gap,the greater the deviation.When the gap is 0.500 mm,the difference between the two results is 20.3%,indicating that the rigid-flexible screw pump spiral slit leakage must be solved using the bidirectional fluid-structure interaction to obtain accurate results.The finite element analysis of the three-dimensional PCP model was carried out by using the bidirectional fluid-structure interaction method.The effects of initial clearance,fluid medium viscosity,single-stage chamber pressure difference,and inlet and outlet pressure on the lea-kage of PCP were studied.The results show that the leakage increases with the increase of initial clea-rance and decreases with the increase of viscosity of the fluid medium.The influence of inlet and outlet pressure change on PCP leakage is very small and can be ignored.The pressure difference between the chambers results in the deformation of the rubber stator,which causes the gap to be formed.This gap changes linearly with the increase of the pressure difference.The volumetric efficiency of the PCP with different lifting pressures is calculated by the bidirectional fluid-structure interaction method,and the error is within±5% when compared with the experimental results.
万方数据
维普
