Experimental and numerical investigation of thermo-hydraulic behavior in a rotating wedge-shaped trailing edge channel with internal jet impingement

Abstract

Cooling the trailing edge of turbine blade presents a significant challenge due to its slender and aerodynamic shape. This paper carries out an experimental and numerical investigation of the thermo-hydraulic behavior within a wedge-shaped trailing edge cooling channel under both stationary and rotating conditions. The studied model incorporates rib-roughened supply channel, internal jet impingement and slots. The examined inlet Reynolds number, rotation number, and temperature ratio were varied within the ranges of 10,000 to 61,000, 0 to 0.16, and 0.08 to 0.16, respectively. Under stationary condition, changing the target surface from trailing to leading surface improves thermal performance within the impingement channel by 15–30%. After rotation is introduced, a portion of fluid is directed towards the low-radius region, resulting in a 10% increase in the heat transfer coefficient at low-radius region, while heat transfer in the high-radius region is diminished. Increasing temperature ratio reduces the effect of rotation, though its influence remains secondary. Moreover, the friction factor and performance evaluation coefficient of two structures with opposite impingement target surfaces were also investigated.