| Citation: | HE Z P，ZHOU J X，XIN J，et al. Endwall profiling of turbine blade hub with rim seal[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（10）：2596-2607 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0728
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To investigate the effect of active endwall control on reducing the influence of rim seal flow on the mainstream passage, this study analyzed the aerodynamic losses of the interaction between the purge flow and the main flow, and the effect of the endwall profiling on the losses reduction, based on the non-axisymmetric endwall profiled by hub static pressure. The results showed that the non-axisymmetric endwall profiling reduces the blockage of the main flow passage by the purge flow, and increases the mass flow rate. The efficiency of the turbine can be increased with a reasonable control of the endwall profiling amplitude. The convex end wall profiling near the leading edge of the blade increases the radial pressure gradient at the exit of the rim seal cavity, and increases the intensity of gas ingestion and purge flow injection. The non-axisymmetric hub endwall profiling reduces the transverse pressure gradient in the main flow passage, lowers the radial position of the hub secondary flow structure and reduces the secondary flow losses caused by the purge flow. The secondary flow kinetic energy is reduced by 1.18% and 3.76% for models with modelling amplitudes of 5% and 8% respectively at the purge flow ratio of 1.2%.
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