Affiliation:
1. Faculty of Engineering and Physical Sciences, University of Surrey , Guildford GU2 7XH, UK
2. University of Surrey
3. Fluid and Acoustic Engineering Laboratory, Beihang University , Beijing 102206, China
Abstract
Abstract
This study investigates turbine rim seal geometry effects within the rotationally-driven ingestion regime. Computations were performed with a wall-resolved unsteady Reynolds-averaged Navier–Stokes (URANS) model and a large-eddy simulation (LES) model including near-wall boundary layer modeling, that is, wall-modeled LES (WMLES). Use of simplified rim sealing models is proposed as an efficient method of ranking seal designs and investigating sensitivity to seal geometry. Four rim seal configurations, two chute seals, an axial seal and a radial seal which are representative of those used in gas turbines and in previous research were investigated. Furthermore, hybrid seals combining geometric characteristics from both the chute and radial seal were considered. Significant sensitivities of sealing performance to turbulence modeling are identified, but URANS and WMLES show similar trends in ranking of seal performance, and these are consistent with previous experimental work. The addition of an outer radial clearance section to a chute seal is effective in reducing ingestion levels.
Reference42 articles.
1. The History of the Siemens Gas Turbine,2008
2. Thermal-Barrier Coatings for More Efficient Gas-Turbine Engines;MRS Bull.,2012
3. Turbine Rim Seal Gas Path Flow Ingestion Mechanisms,1994