受轮缘密封结构影响的1.5级涡轮封严流与主流的相互作用以及轮缘密封间流动干扰

doi:10.7527/S1000-6893.2020.24549

Abstract

Abstract: To investigate the difference in the effects of different rim seal structures upstream of the rotor on the flow interference between the 1.5-stage turbine mainstream and the rim seal, we conduct unsteady numerical simulation for a 1.5-stage turbine with the endwall, the simple chute and simple radial sealing structures at the upstream and simple axial sealing cavity at the downstream with the Shear Stress Transport (SST) turbulence model. The results show that the interference between the rim seals reduces the sealing efficiency of the downstream rim cavity with the radial sealing structure model, enhancing the inherent unsteady characteristics. The influence of the seal structure change on the rotor and the second stator is within the range of 35% and 65% span, respectively. The radial sealing structure increases the blocking effect of the upstream stator blades, the under deflection of rotor inlet flow, the suction surface load at the blade root, and the hub passage vortex strength above 14% span. In addition, more low-frequency pressure fluctuations are generated at the entrance of the second stator, the trailing edge shedding vortex scale increases, while the hub passage vortex strength above 13% span is weaker. Compared with the endwall structure, the aerodynamic efficiency of the 1.5-stage turbine with the chute sealing structure decreases by 0.94% when the total amount of the purge flow is 0.8% of the mainstream flow, and the aerodynamic loss of the 1.5-stage turbine with the radial sealing structure increases by an additional 0.17%.

Key words: 1.5-stage turbine, rim seal structure, end-zone flow, vortex system interaction, interference between rim seals

CLC Number:

HUANG Jingwei, FU Weiliang, MA Guojun, WANG Guojie, GAO Jie. Interaction between 1.5-stage turbine rim seal purge flow and mainstream and flow interference between rim seals affected by rim seal structure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(7): 124549-124549.

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Interaction between 1.5-stage turbine rim seal purge flow and mainstream and flow interference between rim seals affected by rim seal structure

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