An LBM-Based Investigation on the Mixing Mechanism of Double Rows Film Cooling with the Combination of Forward and Backward Jets

Film cooling has been widely applied to the highly efficient thermal protection of gas turbines. By using simplified lattice Boltzmann method (STLBM), a series large-scale simulations film are performed dig up mixing mechanism double rows with combination forward and backward jets at first attempt. The an upstream row jet downstream is considered. Reynolds number 4000. blowing ratio coolant fixed as BR1=0.5. For (BR2), five values ranging from 0.2–0.8 inclination angles 35° 145°, respectively. numerical results reveal that performance greatly improved by due suppression counterrotating vortex pair (CVP). Moreover, flow structure changed jet. An anti-CVP having opposite rotational direction CVP appears large. special weakens adverse effect transports much cooled wall. Correspondingly, time-averaged effectiveness increased fluctuation decreased. All these indicate large improves performance. obtained in this work help optimization scheme, which also benefit promotion application STLBM turbine engineering.