Abstract:The software FLUENT was used to analyze the effects on sealing performance of mechanical seals textured with microgrooves. The effects of groove depth ratio (ratio of the groove length to oil film thickness), width ratio (ratio of the groove width to length of inner arc straight line) and length ratio (ratio of the groove length to the width of cirque) on sealing performance including opening force, leakage and stiffness of fluid film were discussed. The results show that groove depth ratio and width ratio can all be optimized to achieve max opening force and stiffness film, so the groove depth is closely related to film thickness. Under the same width ratio, opening force and film stiffness are increased as groove width and length increasing, while leakage ratio remains unchanged basically, which indicates that groove width of millimeter scale is better than micrometer scale in sealing performance. The opening force and stiffness of fluid film will increase as length ratio increases, however leakage will also increase at the same time.