In order to deeply analyze the performance of the spiral groove upstream pumping liquid mechanical seal when the seal medium is non-Newtonian fluid, taking power-law fluid as the research object, the Reynolds equation and the twodimensional steady flow flowing equation of Newtonian fluid were respectively replaced by the Reynolds equation and the flowing equation of power-law fluid based on Muijderman’s pressure governing equation for Newtonian liquid lubricated bearing. Then the pressure distribution and the sealing performance parameters of the seal, such as the opening force and the leakage, were obtained. A comparison was made with the results for the approximate analytic method and the numerical simulation by Fluent software and the results between the two are consistent. The influence of consistency coefficient m and flow behavior index n on the seal performance was analyzed by the approximate analytic method. The results show that the opening force increases with the increasing of the flow behavior index n and the consistency coefficient m. When the sealed medium is pseudoplastic fluid, the effect of flow behavior index n and the consistency coefficient m on the leakage is weak at small film thickness, [JP2]whereas the leakage increases with the increasing of the flow index n and the consistency coefficient m at large film thickness. The effects of flow behavior index n and the consistency coefficient m on the leakage can be ignored when the sealed medium is bulging plastic fluid.
CHEN Guo,SONG Peng-Yun. Approximate analytic analysis on performance of spiral groove liquid film mechanical seal being applied to seal power-law fluid[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(2): 148-153.