（1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Technical and Research Center of Fluid Machinery Engineering, Jiangsu University， Zhenjiang, Jiangsu 212013, China)
Based on head concept for pumps, the formula for pumping capability of spiral groove on seal loop face was conducted by modifying the defined head formula with consideration of the face mechanical sealing characters, which shows the pumping capability is related with the static pressure distribution on the face. Numerical simulation for the inner flow of the mechanical face seal was carried out by using Fluent software, and the results proved the correctness and applicability of the modified formula. The pumping capabilities of the spiral grooves were analyzed combining the simulation results and the modified formula, and the different simulation results of spiral grooves pumping capability on different loops were compared. It shows that the pumping capability on the rotating loop is better than that on the static one, and the former condition is also better for reducing the friction between the two loops.
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