点阵压气机叶轮轻量化设计及力学性能分析

Lightweight Design and Static Analysis of Compressor Lattice Impeller

关键词:  叶轮  点阵  轻量化设计  有限单元法  3D打印

Key words:  Impeller  Lattice  Lightweight design  Finite element method  3D print

摘要:

以压气机叶轮为研究对象，轻量化设计为研究目标，设计了一种适合旋转周期对称结构应用的点阵填充点阵胞元。其目的是在保证满足设计要求的前提下，使叶轮刚度和强度具有可调性的同时降低叶轮质量。对转速为8×10⁴r/min极限工况下的无填充轮、实心轮和不同点阵梁直径点阵填充轮进行了分析对比。结果表明，单个胞元梁直径为0.2mm，0.4mm，1mm的点阵轮相对于实心轮叶梢的平均周向变形分别降低了4.84%，3.49%，3.71%。对于点阵梁直径为0.4mm的叶轮，其重量相对于实心叶轮可降低22.68%，轮毂与叶片部分应力相对于实心轮可降低75MPa。点阵轮的叶梢周向平均变形位于无填充轮和实心轮之间。这一结果说明点阵填充轮毂的压气机叶轮不但可以有效减重，还可以提高压气机的工作效率。

Abstract:

Taking the compressor impeller as the research object and the lightweight design as the research goal， a lattice filled lattice cell suitable for the application of rotating periodic symmetric structure is designed. Its purpose is to make the rigidity and strength of impeller adjustable and reduce the mass of impeller on the premise of meeting the design requirements. The analysis and comparison of hollow impeller， solid impeller and lattice filled impeller with different lattice beam diameters were carried out under the limit condition of 8×10⁴r/min. The results showed that the average circumferential deformation of lattice impeller with a single cell beam diameter of 0.2mm， 0.4mm and 1mm was 4.84%， 3.49% and 3.71% lower than that of solid impeller tip， respectively. For the impeller with a lattice beam diameter of 0.4mm， its weight can be reduced by 22.68% compared with the solid impeller， and the stress of the hub and blades can be reduced by 75MPa compared with a solid wheel. The average circumferential deformation of the tip of the lattice impeller lies between the unfilled impeller and the solid impeller. The results show that the impeller with lattice filling hub can not only reduce the weight effectively， but also improve the efficiency of the compressor.