SENSITIVITY ANALYSIS OF THE FILM-COOLING EFFECTIVENESS OF AN UPSTREAM CRESCENT-SHAPED VORTEX GENERATOR TO GEOMETRIC PARAMETERS

This study numerically investigates the fl ow fi eld and cooling effectiveness of a cylindrical fl at-plate fi lm-cooling hole with an upstream crescent-shaped vortex generator (CSVG) at the blowing ratio 0.5 and 1.5. With the aid of a new antikidney-shaped vortex pair, this CSVG can markedly improve the cooling effectiveness in comparison to a cylindrical hole. The effects of fi ve geometric parameters completely depicting the CSVG shape are investigated by a four-level and fi ve-parameter Taguchi approach. It is shown that the ranking order of each geometric parameter is improved at both blowing ratios. The preliminary recommended upstream CSVGs with higher area-averaged cooling effectiveness are given for both used ratios
   
Author:  C. Zhang, L. C. Bai, P. F. Zhang
Keywords:  fi lm cooling, cylindrical hole, antikidney-shaped vortex pair, cooling effectiveness, Taguchi approach
Page:  1137