Numerical Investigation On Sealing Characteristics Of Rim Seal

With the rapid development of Aviation industry, turbine inlet temperature and pressure ratio ofthe modern aero gas turbine engines has gradually increased, resulting in leakage of the seal systembetween rotor-stator cavity is becoming more serious, and the merits of seal structure directly affectsthe performance of the gas turbine engine, a high level and high performance sealing structure has animportant role in reducing leakage sealing system.By adopting the RNG k turbulence model and SIMPLE method with CFD softwareFLUENT, a numerical simulation study carried out on the rim seal leakage characteristics, the leakagecoefficient obtained with the rotating speed, rotor-stator teeth overlap height, number of teeth, internalface heat conduction and aerodynamic parameters, the results showed that: the rotating speed impacton the rim labyrinth seal is not obvious; the seal effect of two teeth is better than the individual; inrotor-stator teeth overlap height, the leakage coefficient is generally increased with the radialclearance increases, when the axial clearance at the same; the leakage coefficient overall constantlydecreasing with the increase of axial clearance, when the radial clearance at the same; the leakage canbe significantly decreased when internal face heat conduction was take into consider; Comparison ofthe designed and leakage characteristics of five kinds of different structural forms of the tooth cavityseal seals against the rim structure and the low pressure turbine blades of a conductive work betweenthe seal structure12is the best effect. Rim seal structure designed for low-voltage and low-voltageoperation of a guide vane and contrast between the leakage characteristics of nine different structuralforms of seal tooth cavity, the study found that the effect of structural seal9is the best; leakage withthe increase of the secondary flow pressure ratio increases. These research results can be to providetechnical support for the rim seal.