基于热态叶型的小轮毂比弯掠叶片结构保形设计与优化

发展了一种保持且基于气动设计给定的热态叶型的冷态叶型迭代解算方法,并将其融入叶片罩量调节的优化设计,其中在热态叶型的基础上调节罩量,针对冷态叶型计算变形与应力等,变形后的叶片逼近热态叶型,尽可能减小了对热态叶型气动特性的影响.实现了冷态叶型迭代求解与罩量调节中结构有限元网格的自动更新,并基于iSIGHT优化平台,建立了叶片罩量调节多目标优化设计的自动化分析流程,并以一小轮毂比弯掠风扇叶片罩量调节为例,考查了罩量调节中考虑轮盘与否对优化设计结果的影响.计算分析实例表明:所发展的方法可在保持热态叶型的前提下使叶片最大应力和最大变形分别下降了10.6%和46%.

Structural design and optimization for the deformation approaching to hot pofile of a swept fan blade with smaller hub-to-tip ratio

An iterative method was proposed for determining the cold blade profile from a hot blade profile based on the aerodynamic design. The method was applied to the design optimization of the gravity center tilting of a rotor blade. The optimization was based on the hot profile and the stress calculation on the cold profile. In that way, it could reduce the influence on the aerodynamic performance. A multi-objective optimization procedure of the gravity center tilting based on the commercial package iSIGHT was established by proposing a method of automatically updating the finite element mesh in the determination of cold blade profile. The effect of the disk on the optimization of gravity center tilting of a blade was investigated by referencing a swept fan blade with smaller hub-to-tip ratio. The results show that the maximum values of stress and deformation of a rotor blade are respectively decreased by 10.6% and 46% by the proposed method for a given hot profile from the aerodynamic design.