| Citation: | HU Jianjun, ZHANG Duo, ZHANG Xianglan, et al. Experiment and simulation study on tip leakage suppression by a compound method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(11): 2283-2291. doi: 10.13700/j.bh.1001-5965.2018.0038(in Chinese)
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To reduce the tip leakage and flow loss of gas turbine, the new method of pneumatic seal combined with tip structure modification was put forward based on flow reorganization. Three typical combination schemes of tip groove and spontaneous tip injection were investigated by model test and numerical simulation. The coupling mechanism of the two passive suppression methods was discussed. The results show that the coupling effects between tip groove and spontaneous tip injection (STI) are obvious. When the outlet of STI locates at the base of the groove, strong mixing occurs between the STI and the groove vortex (GV), which deteriorates the suppression effect for both of them, and cannot suppress the leakage flow effectively, so it is not a good coupling scheme. When the outlet of STI locates on the top of rib, neither on pressure side or suction side, the effect of counter blowing by STI and kinetic energy dissipation by GV can add up to generate twice effective seal, meaning that they are effective coupling schemes. In particular, when the outlet of STI locates on the top of suction-side-rib, the suppression effect on leakage flow is the best.
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