Application of Fluid-Solid Couple on Multidisciplinary Optimization Design for Turbine Blade

The multi-field coupled analysis, a higher precision, is an interaction effect among the fluid, the structure strength and the thermal on the turbine design. Considering the coupled effect in the multidisciplinary optimization design (MDO) could further excavate the design potential and improve the optimization precision on the turbine. Thus the paper firstly shows the automatic process of the fluid-solid closely coupled analysis method based on the ALE which would be the foundation of the turbine MDO. The comparison between the analysis result of the couple and the single discipline on the turbine blade proves the transdisciplinary influence each other. Based on kinds of the different precise analysis methods, this paper secondly puts forward the multiple-precision strategy in order to balance the cost and the precision on turbine MDO. This strategy studies the variable complexity method (VCM) which is improved by the two-point scale function and the periodic updating technology and three kinds of precise models including the fluid-solid closely coupled analysis, the single discipline analysis and the approximate equation. The strategy solves the difficulty of disciplinary decoupling and coordination by the collaborative optimization (CO) strategy. Finally, the new strategy could finish the turbine MDO with acceptable performance.