Abstract：The dynamic pressure effect in upstream pumping mechanical seals was studied by using a flow in the 3D parallel micro gap to remove the pumping effect. Three kinds of geometrical and computational models, namely the groove with constant depth bottom, the groove with backward sloping bottom and the groove with forward sloping bottom, were established, respectively; the flow and opening force in those models were calculated by using numerical simulation method when one ring was in motion and one was stationary. The results indicate that there is a high pressure zone in the liquid film thickening zone, and a low pressure zone in the film thinning zone regardless of the bottom shape of a groove in the specified range of parameters. For the groove with constant depth, the opening force is independent on the seal ring moving speed, the groove depth and the gap of the seal when either the flat ring or the grooved ring is in motion before cavitation occurs in the liquid film. After cavitation, however, the opening force significantly increases with increasing translational speed and decreasing gap of the seals. At the same condition, the opening force generated by the moving grooved ring is larger than that by the moving flat one. In addition, deeper groove depth of moving flat ring can increase the opening force and diverging step in the gap will generate further larger result.
陈汇龙, 王强, 刘玉辉, 刘彤, 刘志斌. 三维平行微间隙流场数值模拟[J]. 排灌机械工程学报, 2013, 31(3): 253-258.
CHEN Hui-Long, WANG Qiang, LIU Yu-Hui, LIU Tong, LIU Zhi-Bin. Numerical simulation of flow in 3D parallel micro gap. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(3): 253-258.
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