Numerical Analysis of Dynamic Coefficients in Brush Seal

To analysis the dynamic coefficients of rotor brush seal system, a 3D CFD brush seal computational model was established. The results show that at the same geometry parameter the radial force rise with the pressure ratio in a negative direction, the tangential force increase with the pressure ratio, and the radial force is much greater than the tangential force. And the leakage through the brush seal decreases when the rotor velocity increases. Moreover, radial force component decreases when the rotor velocity increases, but the tangential force component rises with the rotor velocity increases. Direct and cross-coupled stiffness and direct damping and cross-coupled damping were calculated by using the model. The results provide theoretical support to enhance the stability of the rotor system.