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http://dx.doi.org/10.5293/KFMA.2011.14.1.048

Three-Dimensional Flow and Aerodynamic Loss Downstream of Turbine Rotor Blade with a Cutback Cavity Squealer Tip  

Kim, Seon-Ung (금오공과대학교 기계공학부 대학원)
Lee, Sang-Woo (금오공과대학교 기계공학부)
Publication Information
The KSFM Journal of Fluid Machinery / v.14, no.1, 2011 , pp. 48-54 More about this Journal
Abstract
The effect of channel cutback on three-dimensional flow fields and aerodynamic losses downstream of a cavity squealer tip has been investigated in a turbine rotor cascade for the squealer rim height-to-chord ratio and tip gap height-to-chord ratio of $h_{st}/c$ = 5.51% and h/c = 2.0% respectively. The cutback length-to-camber ratio is changed to be $CB/c_c$ = 0.0, 0.1, 0.2 and 0.3. The results show that longer cutback delivers not only stronger secondary flow but also higher aerodynamic loss in the tip leakage vortex region, meanwhile it leads to lower aerodynamic loss in the passage vortex region. The discharge of cavity fluid through the cutback opening provides a beneficial effect in the reduction of aerodynamic loss, whereas there also exists a side effect of aerodynamic loss increase due to local wider tip gap near the trailing edge. With increasing $CB/c_c$ from 0.0 to 0.3, the aerodynamic loss coefficient mass-averaged all over the measurement plane tends to increase slightly.
Keywords
Turbine Rotor Cascade; Cavity Squealer Tip; Channel Cutback; Three- Dimensional Flow; Aerodynamic Loss;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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