Tham khảo tài liệu 'the craft of scientific presentations - m alley (springer 2003) episode 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Fillet Design to Reduce Vortices Along Turbine Vanes in a Gas Turbine Engine Karen A. Thole Virginia Tech Gary Zess Pratt Whitney Motivation If gas turbine engines such as on jets allowed higher inlet temperatures to the turbine the engines could run with more power and use less fuel. Limiting these temperatures is the melting temperature of the turbine vanes Figure 1 . Vortices transport high temperature combustion gases to the vane surfaces Figure 2 . Fillet designs reduce such vortices along the conning towers of submarines. Objective Determine whether a fillet design on turbine vanes can reduce the leading edge and passage vortices. Figure 1. Gas turbine engine. Figure 2. Flow around turbine vane 1 . Methods of study Computational flow field predictions to design the fillet. Wind tunnel testing of turbine vanes that have fillet designs Figures 3 and 4 . Figure 3. Fillet made from silicon mold. Figure 4. Large-scale turbine vane in wind tunnel. Results Velocity vectors show that fillet eliminates leading edge vortex Figure 5 . Computational results show that fillet delays the passage vortex Figure 6 . Figure 5. Velocity profiles with and without fillet 2 . Figure 6. Flow around turbine vane with fillet. Conclusions Fillet design eliminates leading edge vortex and delays passage vortex. Engine manufacturers should consider fillet designs for turbine vanes in gas turbine engines. References 1 Hermanson K. and Thole . 1999 Effect of Inlet Profiles on Endwall Secondary Flows Journal of Propulsion and Power vol. 16 no. 2 pp. 286-296. 2 Kang M. and Thole K. A. 2000 Flowfield Measurements in the Endwall Region of a stator Vane Journal of Turbomachinery vol. 122 pp. 458-466. Figure B-2. Poster showing fillet design for improving the aerodynamics of vanes in a gas turbine Gap-Crossing Decisions by Red Squirrels in Fragmented Forests Victoria J. Bakker University of California Davis Objective To study factors influencing decisions by red squirrels Tamiasciurus
