【摘要】：為降低密封面間液體流動發(fā)散區(qū)液膜壓力損失及提高密封性能,在矩形截面螺旋槽中引入周向斜面臺階結(jié)構(gòu)并建立物理模型。基于JFO空化邊界,探討了不同槽深時,斜面轉(zhuǎn)角比對液膜壓力、降低空穴發(fā)生及流體動壓性能的影響。結(jié)果表明:當斜面轉(zhuǎn)角比小于1/30時,下游泵送或上游泵送液膜密封的周向膜壓或螺旋線方向膜壓均得到迅速提升而空化面積比迅速降低,尤其是上游泵送密封;隨斜面轉(zhuǎn)角比增大,空化面積比先增大后減小,空穴區(qū)中液膜開始破裂位置前緣壓力呈增加趨勢,而液膜重生成位置后緣壓力反之。槽深的增加有助于提升液膜壓力和降低空化面積比,當槽深為8～12μm,在斜面轉(zhuǎn)角比為0.1～0.3時,兩類型液膜密封承載能力均可達到最大值,前者最大增幅約13.5%,后者約28%;摩擦扭矩最大增幅約4.6%,增幅較小;泄漏量隨斜面轉(zhuǎn)角比的變化規(guī)律與承載能力相似。
[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.
【作者單位】： 中國石油大學(華東)密封技術(shù)研究所;中國石油獨山子石化公司;
【基金】：國家自然科學基金項目(51375497) 山東省自主創(chuàng)新及成果轉(zhuǎn)化專項項目(2014ZZCX10102-4)~~
【分類號】：TH136

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