A THREE-DIMENSIONAL FLUID–STRUCTURE COUPLED ANALYSIS OF ROTATING FLEXIBLE ASSEMBLIES OF TURBOMACHINES

✍ Scribed by G. Jacquet-Richardet; P. Rieutord

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 354 KB
• Volume: 209
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1997.1225

✦ Synopsis

Numerous experimental and numerical studies have shown that the stability of rotors is strongly influenced by fluid elements. When considering elements such as journal bearings or seals, the classical rotordynamic approach has been widely used and validated. On the other hand, the rigid wheel assumption seems questionable when considering elements such as fluid leakage at blade tip or secondary flow passages of shrouded impellers. In this paper, a coupling technique between a fluid and a fully three-dimensional rotating flexible wheel shaft assembly is presented. This coupling technique considers alternatively the governing equations of fluid and structure and is based on an interfacing grid concept associated with a modal representation of the coupled system. A first simple application is used for illustrating and validating the proposed method. Computed results are compared to results given by a classical rotordynamic approach. Then the method is applied to a test flexible wheel-shaft-bearing assembly. Various configurations are studied and the influence of wheel flexibility on the overall behaviour is illustrated in all cases.