周向斜面台阶螺旋槽液膜密封流体动压性能
发布时间：2018-08-10 22:07
【摘要】：为降低密封面间液体流动发散区液膜压力损失及提高密封性能,在矩形截面螺旋槽中引入周向斜面台阶结构并建立物理模型。基于JFO空化边界,探讨了不同槽深时,斜面转角比对液膜压力、降低空穴发生及流体动压性能的影响。结果表明:当斜面转角比小于1/30时,下游泵送或上游泵送液膜密封的周向膜压或螺旋线方向膜压均得到迅速提升而空化面积比迅速降低,尤其是上游泵送密封;随斜面转角比增大,空化面积比先增大后减小,空穴区中液膜开始破裂位置前缘压力呈增加趋势,而液膜重生成位置后缘压力反之。槽深的增加有助于提升液膜压力和降低空化面积比,当槽深为8～12μm,在斜面转角比为0.1～0.3时,两类型液膜密封承载能力均可达到最大值,前者最大增幅约13.5%,后者约28%;摩擦扭矩最大增幅约4.6%,增幅较小;泄漏量随斜面转角比的变化规律与承载能力相似。
[Abstract]:In order to reduce the pressure loss of liquid film in the liquid flow divergence zone between sealing surfaces and improve the sealing performance, the circumferential inclined step structure was introduced into the spiral groove with rectangular section and the physical model was established. Based on the cavitation boundary of JFO, the influence of angle ratio of inclined plane on liquid film pressure and the influence of cavitation occurrence and hydrodynamic pressure on the hydrodynamic performance of different groove depths are discussed. The results show that when the angle ratio of inclined plane is less than 1 / 30, the circumferential membrane pressure or spiral film pressure of downstream pump liquid film seal or upstream pump liquid film seal are raised rapidly, and the cavitation area ratio decreases rapidly, especially the upstream pump seal. The cavitation area ratio increases firstly and then decreases with the increase of the angle ratio of inclined plane. The pressure of the front edge of the liquid film begins to rupture in the hole region and the pressure of the liquid film rebirth becomes the backward edge pressure of the position. The increase of tank depth helps to raise the pressure of liquid film and reduce the cavitation area ratio. When the depth of the groove is 812 渭 m and the angle ratio of inclined plane is 0.1 渭 m, the load-carrying capacity of the two types of liquid film seals can reach the maximum value. The maximum increment of the former is about 13.5, the latter is about 28; the maximum increase of friction torque is about 4.6, the increase is smaller; the variation of leakage with angle ratio of inclined plane is similar to that of bearing capacity.
【作者单位】： 中国石油大学(华东)密封技术研究所;中国石油独山子石化公司;
【基金】：国家自然科学基金项目(51375497) 山东省自主创新及成果转化专项项目(2014ZZCX10102-4)~~
【分类号】：TH136
本文编号：2176350
[Abstract]:In order to reduce the pressure loss of liquid film in the liquid flow divergence zone between sealing surfaces and improve the sealing performance, the circumferential inclined step structure was introduced into the spiral groove with rectangular section and the physical model was established. Based on the cavitation boundary of JFO, the influence of angle ratio of inclined plane on liquid film pressure and the influence of cavitation occurrence and hydrodynamic pressure on the hydrodynamic performance of different groove depths are discussed. The results show that when the angle ratio of inclined plane is less than 1 / 30, the circumferential membrane pressure or spiral film pressure of downstream pump liquid film seal or upstream pump liquid film seal are raised rapidly, and the cavitation area ratio decreases rapidly, especially the upstream pump seal. The cavitation area ratio increases firstly and then decreases with the increase of the angle ratio of inclined plane. The pressure of the front edge of the liquid film begins to rupture in the hole region and the pressure of the liquid film rebirth becomes the backward edge pressure of the position. The increase of tank depth helps to raise the pressure of liquid film and reduce the cavitation area ratio. When the depth of the groove is 812 渭 m and the angle ratio of inclined plane is 0.1 渭 m, the load-carrying capacity of the two types of liquid film seals can reach the maximum value. The maximum increment of the former is about 13.5, the latter is about 28; the maximum increase of friction torque is about 4.6, the increase is smaller; the variation of leakage with angle ratio of inclined plane is similar to that of bearing capacity.
【作者单位】： 中国石油大学(华东)密封技术研究所;中国石油独山子石化公司;
【基金】：国家自然科学基金项目(51375497) 山东省自主创新及成果转化专项项目(2014ZZCX10102-4)~~
【分类号】：TH136
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