Numerical simulation on aero-engine turbine rim sealing#br#

Abstract

Abstract: Aero-engine turbine rim sealing is vital for rotor-stator system protection. In order to avoid main flow high temperature gas ingesting into rotor-stator system, it is necessary to induce low temperature gas inflow to rotorstator system. 2D RANS model and SST turbulence model are used to study the effect of different sealing flow on sealing efficiency, the minimum sealing flow is determined by pressure parameter method, the influence of different seal heights on sealing efficiency is studied. Results show that with the increase of sealing flow, the turbine flange is gradually sealed and the sealing efficiency of turbine rim increases. At the same time, the outflow of sealing gas from turbine cavity into mainstream results in the increase of mainstream pressure, which makes the sealing gas has a certain influence on the main stream. Because the sealing gas is filled with disk cavity, it is difficult for the high-temperature mainstream gas to enter the disk cavity, and the heat exchange between mainstream gas and sealing gas occurs in the entrance area of layer seal, which makes great change of temperature, mainstream gas and improves the sealing efficiency; meanwhile, experimental results show that
different sealing layer heights has no effect on sealing efficiency.

Key words: aero-engine, turbine rim sealing, seal height, numerical simulation

CLC Number:

V235.13

TAO Liquan, MA Zhen, QIU Xuewang. Numerical simulation on aero-engine turbine rim sealing#br#[J]. Journal of Civil Aviation University of China, 2020, 38(1): 13-18.

References 12

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