Methodology of efficient cooling structures design for double-wall turbine cooling blades

Aimed to cooling design of double-wall turbine blades， a parametric design method with high robustness and design flexibility was established. A design process was proposed for double-wall blades structure， which included controlling the blade wall thickness with offset curves， adding baffles to divide the cooling chambers， and incorporating cooling units into each chamber. Based on this， a parametric modeling method was developed， incorporating wall thickness， baffles， trailing edge cutbacks， film holes， impingement holes， and pin fins. Rapid and accurate parametric design of the blade in all aspects， including the overall blade configuration， internal chambers， and cooling units， could be achieved through this method. Furthermore， a double-walled blade model with excellent cooling performance was constructed， which was equipped with film cooling， impact cooling and enhanced heat transfer by turbulent column. Finally， the temperature field of the blade was obtained by fluid-thermal coupling numerical simulations. The results indicated that the average surface temperature （Tw） of the blade was 1 190 K， and the overall cooling efficiency （η） reached 0.746. This method achieved the precise modeling of efficient cooling structures， thus improving the design efficiency of turbine blades.