Constraints and CFD simulation-based parametric reconstruction for 2D blade profile in reverse engineering

Blade profile plays an extremely important role in the aerodynamic performance of turbomachinary. However, in the process of secondary machining for near-net shape blade and serviced blade, the deviation between nominal profile and measured data can raise serious problems for NC tool path generation. It is even worse that unreasonable reconstruction may be responsible for the deteriorated aerodynamic performance and subsequent high in-service cost. This paper presents a parametric reconstruction strategy for 2D blade profile in reverse engineering. The reconstruction profile approaches to the nominal model and its performance is proved to be more acceptable. This consists in the optimization of parametric geometry (modeling and modification) based on parameter constraints and computational fluid dynamics simulation rather than measured data itself. Some practical examples are used to demonstrate the usefulness and superiority of the strategy.