Wave Propagation In Pipeline Research Articles

Transient Wave Scattering and Its Influence on Transient Analysis and Leak Detection in Urban Water Supply Systems: Theoretical Analysis and Numerical Validation

This paper investigates the impacts of non-uniformities of pipe diameter (i.e., an inhomogeneous cross-sectional area along pipelines) on transient wave behavior and propagation in water supply pipelines. The multi-scale wave perturbation method is firstly used to derive analytical solutions for the amplitude evolution of transient pressure wave propagation in pipelines, considering regular and random variations of cross-sectional area, respectively. The analytical analysis is based on the one-dimensional (1D) transient wave equation for pipe flow. Both derived results show that transient waves can be attenuated and scattered significantly along the longitudinal direction of the pipeline due to the regular and random non-uniformities of pipe diameter. The obtained analytical results are then validated by extensive 1D numerical simulations under different incident wave and non-uniform pipe conditions. The comparative results indicate that the derived analytical solutions are applicable and useful to describe the wave scattering effect in complex pipeline systems. Finally, the practical implications and influence of wave scattering effects on transient flow analysis and transient-based leak detection in urban water supply systems are discussed in the paper.

Study on Explosion Suppression Technologies for Oil and Gas Pipeline

Considering potential explosion hazard of oil and gas pipeline, the technological solutions have been proposed, within certain transportation distance to fill non-metallic explosion suppression material with good chemical stability and high pressure resistance to prevent flame and explosion wave propagation in pipeline. Detonated in the high voltage ignition and chemical ignition head two types of gasoline vapor explosion conditions, spherical explosion suppression material filling stop explosion pressure propagation and realize the explosion suppression function. The results of horizontal shock tube experiment shows that there are obvious laws of blasting pressure increase drop before and after filling explosion suppression materials. The transport resistance form 150mm diameter steel pipeline filled with explosion suppression material has also been investigated in different length and different air velocity conditions. The experimental results show that filling spherical explosion suppression material have had a limited effect in transportation capacity of pipeline.