TY  - JOUR
TI  - EFFECTS OF PIN FIN SHAPE AND SIZE ON TURBINE BLADE TRAILING EDGE FLOW AND HEAT TRANSFER
AB  - In modern turbine blades, pressure-side cutbacks with film-cooling slots stiffened with lands and pin finsthat are embedded in passages are used to cool trailing edges. There are many studies that have investigated thesecooling configurations from a thermal perspective, while only a limited number have been concerned with theaerodynamic aspects. This study presents a thorough computational investigation of a film-cooling configuration todetermine the optimum combination of shape and size of pin arrays. The analyses are performed to include both internaland external surfaces of the trailing-edge cutback region and the results are evaluated from both aerodynamics andthermal aspects. The internal structure of the configuration studied consists of staggered arrays of pins and airfoilshaped blockages in front of the slot exits that open into a pressure-side cutback region. The pins used are of circular,elliptical, or airfoil shapes that are rarely studied in such configurations, and of different sizes, resulting in five differentmodels for comparisons. The flow features, pressure losses and heat transfer characteristics inside of the trailing-edgesurfaces and in the vicinity of the slots and on the external cutback region are examined. The airfoil-shaped pins arefound to decrease the pressure losses in internal flow compared to the other pin shapes of similar size. However, thepin arrays produce minor differences in the velocity contours in the breakout region, resulting in similar pressure losstrends here. The small-sized pins are found to demonstrate slightly higher film-cooling effectiveness on the breakoutsurface due to lower temperatures at the slot exit. It can be inferred from the results that, since the airfoil-shaped pinreduces the aerodynamic penalty across the internal pin array, performing an optimization on the size of these pins toachieve the desired cooling performance could be a reasonable approach in the design process.
AU  - TUNÇEL, Tuğba
AU  - S. KAHVECİ, Harika
PY  - 2019
JO  - Isı Bilimi ve Tekniği Dergisi
VL  - 39
IS  - 2
SN  - 1300-3615
SP  - 191
EP  - 207
DB  - TRDizin
UR  - http://search/yayin/detay/370258
ER  -