THE EFFECT OF REVERSE AND OPPOSITE INJECTION ON THE FILM COOLING PERFORMANCE OF A SYMMETRICAL TURBINE BLADE

A numerical investigation on the fi lm cooling performance of a symmetrical turbine blade is carried out for reverse injection (RH), forward injection (FH), and opposite injection (OH) which combines forward and reverse injection holes. Another objective of this work is to study the eff ect of the distances between the injection holes, and three diff erent distances are considered. Five confi gurations are computed for fi ve blowing ratios. A coolant fl ow is injected through holes inclined at 110 and 70o for reverse and forward jets, respectively. The laterally averaged fi lm cooling eff ectiveness is obtained using commercial software ANSYS-CFX. In addition, several velocity vectors and contours are presented for analyzing the thermal behavior. The numerical model is based on the Navier–Stokes equations and the Reynolds stress turbulence model (SSG-RSM). The obtained results enable one to choose confi gurations with high fi lm cooling eff ectiveness for diff erent blowing ratios. 
A numerical investigation on the fi lm cooling performance of a symmetrical turbine blade is carried out for reverse injection (RH), forward injection (FH), and opposite injection (OH) which combines forward and reverse injection holes. Another objective of this work is to study the eff ect of the distances between the injection holes, and three diff erent distances are considered. Five confi gurations are computed for fi ve blowing ratios. A coolant fl ow is injected through holes inclined at 110 and 70o for reverse and forward jets, respectively. The laterally averaged fi lm cooling eff ectiveness is obtained using commercial software ANSYS-CFX. In addition, several velocity vectors and contours are presented for analyzing the thermal behavior. The numerical model is based on the Navier–Stokes equations and the Reynolds stress turbulence model (SSG-RSM). The obtained results enable one to choose confi gurations with high fi lm cooling eff ectiveness for diff erent blowing ratios. 
Author:  K. Boualem, F. Ben Ali Kouchih, O. Ladjedel, T. Yahiaoui,A. Azzi
Keywords:  reverse injection, forward injection, opposite injection, symmetrical turbine blade
Page:  1143