Abstract
Experiments and numerical simulations are conducted to investigate the flow and heat transfer characteristics of the guiding pin-fin array in a rotating wedge-shaped channel. The rotating experiments cover Reynolds number ranges from 10,000 to 80,000 and rotation number ranges from 0 to 0.46. The results demonstrate that the guiding pin-fin array can significantly reduce the endwall temperature and pressure loss in the wedge-shaped channel. To further enhance channel heat transfer uniformity, clearances were introduced to the guiding pin fins at the channel root region. The numerical results show that this structural modification effectively improved the endwall heat transfer intensity at the mid-span of the wedge-shaped channel. In cases Re = 50,000 and Ro = 0.075, the leading and trailing endwall Nusselt numbers of the detached guiding pin-fin array were 6.5% and 4.8% higher than those of the guiding pin-fin array. Further comparisons at Ro =0.075 and 0.15 revealed that the leading and trailing endwall heat transfer discrepancy coefficient (d) of the detached guiding pin-fin array was 61.8% and 42.2% lower than that of the circular pin-fin array, respectively. In high temperature cases with solid domain, the detached guiding pin-fin array also can provide superior cooling performance. In the wedge-shaped channel with detached guiding pin-fin, the maximum and average temperature values of the solid domain are about 10% lower than that of the channel with circular pin-fin.
