Study on disk and blade design based on multi-layer optimization strategy

For the turbine multi-discipline optimization (MDO) design, the important principle of MDO firstly extended to component autonomy from disciplinary autonomy. Based on these principles, four kinds of MDO frameworks, which were applied on the turbine design, combining present MDO strategies including BLISS(bi-level integrated system synthesis)2000, CO(collaborative optimization) and ATC(analytical target cascading) were designed. Both the two-layer including double-subsystem strategy and the two-layer including triple-subsystem strategy were built by BLISS2000 strategy as the two-layer framework for turbine design, while the three-layer including triple-subsystem strategy gave the full play to the merits of BLISS2000 and CO strategies. The ATC optimization strategy required huge extra optimization cost, so it is not qualitatively suitable for triple-layer MDO strategy on turbine. After testing, the preponderance of the multi-layer optimization strategies including three subsystems is higher efficiency, while complex interactions between layers always lead to worse optimization accuracy and efficiency on three layers strategy compared with two layers strategy.