A new type of dry gas seal with bi-direction trapezoid grooves used as the containment seal for a pump was introduced and main geometrical parameters of the seal were defined.Based on gas lubrication theory,a numerical simulation model of the flow field between the seal faces of the seal was established.In order to obtain the pressure distribution,gas velocity field,opening force of the gas film,and seal leakage,the Fluent software was used to simulate the gas flow between the faces.The influences of the geometrical parameters,such as groove depth,groove width ratio,groove inlet angle,and groove length ratio on the face opening force and leakage were discussed.The results showed that both the opening force and the leakage increased with the increased of groove depth,width ratio,and length ratio and decreased with the increase of groove inlet angle. The results could provide the basis for design and further investigation of the dry gas seal with bi-direction trapezoid grooves.
