甩油盘系统内部流场数值模拟

To obtain how the internal flow affects the atomization performance, the slinger system which includes oil ring and slinger was studied by numerical simulation. In the oil ring, greater flow rate causes poorer flow distribution uniformity. The appropriate outlet diameter can improve the flow distribution uniformity. Larger number of outlets breaks the distribution uniformity of the flow, but when the number increases to a certain value, the flow distribution will be more even. The outlet flow rates are different when at different locations, the maximum flow deviation is about 2%. The flow distribution uniformity is poorest when the outlet diameters are inconsistent. In the research of slinger, a concept of liquid equivalent diameter was introduced to quantitatively measure the effects of the internal flow on slinger's atomization. The results show that when the rotating speed increases, the liquid film inside the slinger becomes thinner, the spay SMD becomes smaller and more uniform, and the penetration depth becomes smaller. When the flow rate increases, the spray SMD becomes larger and the penetration depth increases. The axial distance between the inlet and the outlet causes the change of the liquid velocity and the liquid equivalent diameter at outlet to be less than 5%, and the effect can be ignored. Increasing the outlet diameter can improve the spray quality when the outlet diameter is smaller than 1.7mm. The outlet channel angle mainly affects the axial distribution of the spray. Increasing the outlet number can reduce the spray SMD.