Deformation characterization method of typical double-walled turbine blade structure during casting process

To address the complex structures, large out-of-tolerance issues, and inconsistent quality of double-walled turbine blades, a mapping relationship between the structure and deformation was established based on a structural correlation study. Numerical simulations and pouring experiments were carried out based on the designed double-walled model, and a reliable displacement field model of the double-walled blade was established. A decoupling method for the displacement field of the double-walled blade castings was proposed, which decoupled the displacement field into bending, torsion, and expansion/shrinkage deformation vectors. Based on the displacement field analysis of the theoretical and physical models, an expansion/shrinkage model of double-walled blade structure castings was established. Furthermore, an experiment to determine the mapping relationship between double-walled construction and deformation was designed, which included the characteristic distribution distance and designed angle as structural parameters. The functional relationship between the deformation and the structural parameters was established based on a nonlinear regression method.