*Hot gas ingestion into the wheel space can reduce the lifetime of vulnerable components in gas turbine such as turbine disk. Rim seal structure at the periphery of the wheel-space is designed to protect the turbine disk from hot gas. This paper describes the steady and unsteady Reynolds-averaged Navier-Stokes (RANS and URANS) computation method with Shear Stress Transport (SST) turbulent model using commercial CFD code and the validation of grids. The steady and unsteady CFD computation have been carried out in a one stage turbine model with different rim seal configurations: fishmouth rim seal and double rim seal. A 10.91 sector computation model comprises one pitch in a row of stator vanes and rotor blades is set up and simulated with different sealant flow rate.* *Results show that the fishmouth rim seal can achieve highest sealing effectiveness with low sealant flow rate by installing* *the inner shell at high radius on the stator disk. The vortex generated by the rim structure at the periphery of wheel-space can reduce the radical velocity of the ingested mainstream flow. The comparison between the steady and unsteady results indicates that the steady computation can under-predict the level of the hot gas ingestion, especially in double rim seal configuration. It can be found in the unsteady computation results at different time steps that, for the unsteady simulation with the rotating effect considered, the interaction between the vane wake and the wave of the blade leading edge can lead to* *more serious pressure asymmetry, which worsens the hot gas ingestion.*


Numerical Investigation on Unsteady Characteristics in Different Rim Seal Geometries: Part B

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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