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http://dx.doi.org/10.5293/KFMA.2004.7.5.036

The Effect of Tip Clearance Height on the Three-Dimensional Flow and Aerodynamic Loss in the Wake Region of a High-Turning Turbine Rotor Cascade  

Kwon, Hyun-Goo ((주)벤토피아)
Park, Jin-Jae (금오공과대학교 기계공학부 대학원)
Lee, Sang-Woo (금오공과대학교 기계공학부)
Publication Information
The KSFM Journal of Fluid Machinery / v.7, no.5, 2004 , pp. 36-42 More about this Journal
Abstract
The effect of tip clearance height on the three-dimensional flow and aerodynamic loss in the wake region of a high-turning turbine rotor cascade has been investigated with a miniature cone-type five-hole probe. Distributions of velocity magnitude, secondary velocity vectors, and total-pressure loss coefficient are presented for three tip gap-to-span ratios of h/s = 0.0, 0.5 and 1.0 percent. The result shows that with the increment of h/s, tip leakage vortex tends to be intensified and aerodynamic loss due to the leakage vortex is increased as well. In the case of h/s = 1.0 percent, aerodynamic loss in the tip-leakage flow region is found dominant in comparison with that in the passage vortex region. With increasing h/s, mass-averaged secondary loss coefficient has a greater portion in the mass-averaged total-pressure loss coefficient.
Keywords
Tip Clearance Height; Three-Dimensional Flow; Aerodynamic Loss; Wake; High-Turning Turbine Rotor;
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  • Reference
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