Autor(es): de Sousa Ramos, Helena Maria ; Covas, D. ; Borga, Alexandre ; Loureiro, D.
Data: 2004
Identificador Persistente: http://hdl.handle.net/10400.21/1329
Origem: Repositório Científico do Instituto Politécnico de Lisboa
Assunto(s): Surge damping; Energy dissipation; Elastic or non-elastic behaviour; Pressure oscillations
The current study focuses on the analysis of pressure surge damping in single pipeline systems generated by a fast change of flow, conditions. A dimensionless form of pressurised transient flow equations was developed. presenting the main advantage of being independent of the system characteristics. In lack of flow velocity profiles. the unsteady friction in turbulent regimes is analysed based on two new empirical corrective-coefficients associated with local and convective acceleration terms. A new, surge damping approach is also presented taking into account the pressure peak time variation. The observed attenuation effect in the pressure wave for high deformable pipe materials can be described by a combination of the non-elastic behaviour of the pipe-wall with steady and unsteady friction effects. Several simulations and experimental tests have been carried out. in order to analyse the dynamic response of single pipelines with different characteristics, such as pipe materials. diameters. thickness. lengths and transient conditions.
