基于多层优化策略的涡轮盘叶设计研究

针对涡轮多学科优化设计,将多层优化策略中的重要原则学科自治扩展到组件自治;并结合目前的多学科优化策略BLISS(bi-level integrated system synthesis)2000和CO(collaborative optimization)以及ATC(analytical target cascading),设计出新的多学科优化框架.利用BLISS2000建立了涡轮盘叶的两层双子系统优化框架和两层三子系统的优化框架;结合BLISS2000和CO各自的优点构建了三层三子系统优化框架;从定性的分析角度排除了ATC在涡轮多学科多层优化设计上的应用.通过对比分析,三子系统的多层优化策略的优势主要体现在优化效率方面;层与层之间存在复杂的交互迭代过程导致三层系统往往比双层系统表现出差的精度和效率. 

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.