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http://dx.doi.org/10.3795/KSME-B.2014.38.5.399

Three-Dimensional Flow and Aerodynamic Loss in the Tip-Leakage Flow Region of a Turbine Blade with Pressure-Side Winglet and Suction-Side Squealer  

Cheon, Joo Hong (Dept. of Mechanical Engineering, Kumoh Nat'l Institute of Technology)
Kang, Dong Bum (Dept. of Mechanical Engineering, Kumoh Nat'l Institute of Technology)
Lee, Sang Woo (Dept. of Mechanical Engineering, Kumoh Nat'l Institute of Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.5, 2014 , pp. 399-406 More about this Journal
Abstract
Three-dimensional flow and aerodynamic loss in the tip-leakage flow region of a turbine blade equipped with both a pressure-side winglet and a suction-side squealer have been measured for the tip gap-to-span ratio of h/s = 1.36%. The suction-side squealer has a fixed height-to-span ratio of $h_s/s$ = 3.75% and the pressure-side winglet has width-to-pitch ratios of w/p = 2.64%, 5.28%, 7.92% and 10.55%. The results are compared with those for a plane tip and for a cavity squealer tip of $h_{ps}/s$ = 3.75%. The present tip delivers lower loss in the passage vortex region but higher loss in the tip-leakage vortex region, compared to the plane tip. With increasing w/p, its mass-averaged loss tends to be reduced. Regardless of w/p, the present tip provides lower loss than the plane tip but higher loss than the cavity squealer tip.
Keywords
Gas Turbine; Turbine Cascade; Tip-Leakage Flow; Winglet; Squealer; Aerodynamic Loss;
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