| Citation: | HE Z P，ZHOU J X，XIN J，et al. Unsteady flow characteristics of turbine rotor passage under rim seal effect[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（2）：273-283 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0223
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In order to study the influence of the rim seal between the turbine wheelspace on the downstream rotor passage, numerical simulations were performed on the flow field distribution and aerodynamic loss in the turbine rotor passage when unsealed cavity, unsealed air flow and different purge flow rates were employed. The research results show that the airflow at the exit of the sealed cavity is affected by the relative position change of the stator and the rotor, showing a strong unsteady characteristic, and the change is consistent with the motion period of the rotor. The unsteady fluctuation of the inlet position of the rotor is affected by the purge flow and the leading edge potential field. The purge flow causes circumferential and radial velocity changes as well as a strong unsteady effect. The deflection of the main flow in the end wall caused by the purge flow in the rotor passage changes the stagnation point of the horseshoe vortex on the leading edge and strengthens the pressure side leg of the horseshoe vortex. The shear induced vortex on the suction side of the blade changes the formation mechanism of the hub passage vortex, and the position of the suction side relative to the low pressure area.
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