Leakage and stability of the tip seal is critical to the overall performance of the turbomachinery. This paper establishes a three-dimensional thermal fluid structure interaction analysis model for turbine tip seal

and investigates the deformation of rotor under the joint influence of centrifugal force

thermal stress

and flow field force

the thermal fluid structure interaction between the flow field and the seal teeth

and their joint effects on leakage performance and rotor stability. The results show that the effect of rotor deformation reduces the leakage by about 58.7%

increases the effective damping by about 151%

increases the absolute value of negative tangential force

and improves the sealing performance. The thermal fluid structure interaction between the sealing flow field and the sealing teeth leads to a reduction in the leakage of about 2.3%

a decrease in the effective damping of about 27%

a decrease in the absolute value of the negative tangential force

and a decrease in the ability to inhibit rotor swirl

which is not conducive to the stability of the system. Considering the combined effect of both at the same time

the leakage is reduced by about 60.5%

the effective damping is basically the same as that of the case where only the effect of rotor deformation is taken into account

and sealing performance is mainly affected by the rotor deformation brought about by the centrifugal force

thermal stresses

and the force of the flow field.