螺旋角对单螺杆泵泄漏影响的数值计算

为了探究不同泵结构参数对单螺杆泵泄漏的影响,以1/2型线全金属单螺杆泵为例构建几何模型,基于PumpLinx软件进行瞬态数值计算,并结合外特性试验验证其可靠性,对不同总螺旋角下单螺杆泵的流量变化规律及流场分布展开研究.研究结果表明:单位螺旋角恒定条件下,时均流量随着总螺旋角的增加、单位压差的减小而增大;瞬时流量极小值随着总螺旋角的增加而减小,极大值基本保持一致,接近理论流量17.9 m³/h.斜向泄漏缝隙两侧压力随定子转子啮合位置变化,特定位置压力差随着总螺旋角的增大而减小;特定啮合区监测点的瞬态泄漏流速极大值随着总螺旋角的增大而减小,其极大值最小为4.3 m/s.相关研究成果对于单螺杆泵的泄漏分析具有一定的借鉴意义与参考价值.

Numerical simulation on influence of helix angle on single screw pump leakage

In order to explore the influence on the single screw pump leakage of different structure parameters, a geometric model of 1/2-line all-metal single screw pump was constructed as an example. Based on PumpLinx software for the transient numerical simulation, the reliability of results on CFD model was verified by the external characteristic test. And the flow variation law and flow field distribution of single screw pump with different total helix angles were studied. The results show that under the condition of constant unit helix angle, the time-average flow rate increases with the increase of the total helix angle and the unit pressure difference decreases. The minimum instantaneous flow rate decreases with the increase of the total helix angle. The value is basically consistent and close to the theoretical flow rate of 17.9 m³/h. The pressure on both sides of the oblique leakage gap changes with the engagement position of the stator and rotor, and the pressure difference at a specific position decreases with the increase of total helix angle. The maximum value of the transient leakage velocity at the monitoring point of a specific meshing zone decreases with the increase of total helix angle, and the minimum value is 4.3 m/s. Relevant research results have certain reference significance for leakage analysis and optimization design of single screw pump.