A kind of negative dislocated seal based on the dislocated bearing theory was presented to eliminate hydrodynamic effects and reduce air induced force. The static and dynamic characteristics of negative dislocated seals based on computational fluid dynamic (CFD) moving-gird technology were put forward. The effects of the eccentricity ratio and dislocation ratio on the leakage

circumferential pressure distribution

air force

rotor dynamic characteristics coefficients

and seal rotor stability were analyzed. Results show the seal leakage increases with the eccentricity ratio and dislocation ratio; the seal gap fluid circumferential pressure distribution satisfies the sine law. Compared with the traditional cylinder seals

the negative dislocated seal has divergent wedge gap

and reduces the hydrodynamic pressure effects

circumferential pressure difference and seal tangential force. This is the main reason for the negative dislocated seal suppression of air force. With the increase of the eccentricity ratio

the seal absolute value of stiffness and the cross-coupled damping increase and the direct damping decreases. This seal can effectively reduce the cross-coupled stiffness and increase the direct damping coefficients

the effective stiffness and effective damping so that the seal stability improves.