Fluidelastic vibration and wear of U-bend region of a heat exchanger
- Westinghouse Corp., Pittsburgh, PA (United States). Nuclear Services Division
Wear of steam generator tubes is an important concern because worn tubes must be plugged and removed from service to prevent primary system fluid leakage. Tube wear occurs when secondary fluid flow-induced vibrations cause contact of a tube with components that comprise its support system. Here, a parametric study is presented to assess flow-induced wear for a representative tube in a U-bend region, under the assumption that the out-of-plane vibrations are fluidelastic and the in-plane vibrations are turbulence induced. The parameters selected for the study are: AVB (antivibration bar) support configuration, level of flow, eccentricity of tube-to-AVB clearance, and damping factor. Numerical simulation of U-bend tube wear provides, over the configurations, a conservative estimate for the (normalized) work rate as a measure of wear, in terms of the reduced velocity, the damping factor of the structure, and the mass ratio. The study is based upon certain equations which are derived for a class of nonlinear fluidelastic systems that satisfy the Connors` conditions in a square pitch U-bend.
- OSTI ID:
- 131703
- Report Number(s):
- CONF-950740-; ISBN 0-7918-1329-0; TRN: 96:005084
- Resource Relation:
- Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Flow-induced vibration 1995. PVP-Volume 298; Pettigrew, M.J.; Au-Yang, M.K.; Fujita, K. [eds.]; PB: 183 p.
- Country of Publication:
- United States
- Language:
- English
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