Three-dimensional conjugate heat transfer analysis on effects of impingement-hole arrangement and trailing-edge-pin-fin diameter on a novel double-wall turbine blade

In this study, advanced cooling methods (double-wall effusion cooling and pin-finned slot) are applied to a novel turbine blade. Conjugate heat transfer simulations are performed on the 3D turbine blade to investigate the effects of impingement-hole arrangement and trailing-edge-pin-fin diameter through flow field and heat transfer performance under a certain set of boundary conditions. Numerical results indicate that the impingement channel’s turbulence offsets spanwise pressure reduction, controlling effusion-hole mass flow difference within 8 % and improving cooling effectiveness uniformity via periodic impingement hole mass flow. Leading-edge impingement hole position shifts spanwise maximum cooling effectiveness and affects local heat transfer; trailing-edge cooling relies on pin-fins, with larger pin-fins boosting vorticity, convective heat transfer (up to 10 %), and cooling uniformity. Limitations include uniform solid material assumption, and future work may explore transient characteristics and expanded boundary conditions.