Three-Tier Impingement Cooling Scheme for Heat Transfer Enhancement at the Trailing Edge of a Turbine Blade
Pritish R. Paridaa, Kapil Panchalb and Srinath V. Ekkadc
Department of Mechanical Engineering, Virginia Tech., Blacksburg, VA 24061, USA.
apparid1@vt.edu
bkpanchal@vt.edu
csekkad@vt.edu
ABSTRACT
Over the years, various efforts have been made to maximize the heat transfer coefficients for turbine blade internal cooling while minimizing the coolant flow rate. Leading and trailing edges are such regions on the turbine blade that require a high heat transfer rate. The size and strength constraints at the trailing edge significantly reduce cooling options. The present study aims at obtaining a much higher heat transfer coefficient at the trailing edge with only minor modifications to the existing designs. The proposed scheme, which is essentially based on three pass impingement cooling, helps produce high heat transfer rates as well as helps provide structural rigidity to the trailing edge. ANSYS-CFX simulations were conducted to better understand the flow physics and thermal behavior.
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