Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Peak Pressure Surges and Pressure Damping Following Sudden Air Pocket Compression
AbstractSurges caused by the sudden compression of entrapped air pockets are a source of serious issues in various hydraulic conveyance systems. Such surges may appear during rapid filling of storm-water sewers and storage tunnels, priming of water pipelines, and other applications when air is quickly displaced by inflows. When ventilation is inadequate during rapid filling conditions, sudden air compression can occur leading to pressures that may exceed design limits and cause structural damage. Past studies have provided various insights in air-water interactions in closed pipes during rapid filling conditions, but the focus of the majority of these studies was to support the development and improvement of numerical models. Fewer experimental studies focused on the effect of geometric characteristics such as pipe diameter and length/diameter ratios, as well as systematic investigation of various air pocket volumes and filling flow rates. The present work addresses this knowledge gap, measuring pressure surge peaks and the damping of pressure surges following the first peak. In this investigation, kinetic energy and linear momentum dimensionless groups were analyzed as potential alternatives to represent peak surges as as well surge damping. Findings in this study provide further insight into parameters governing air-water surge magnitudes, and on the peak surge attenuation following sudden compression.
Peak Pressure Surges and Pressure Damping Following Sudden Air Pocket Compression
AbstractSurges caused by the sudden compression of entrapped air pockets are a source of serious issues in various hydraulic conveyance systems. Such surges may appear during rapid filling of storm-water sewers and storage tunnels, priming of water pipelines, and other applications when air is quickly displaced by inflows. When ventilation is inadequate during rapid filling conditions, sudden air compression can occur leading to pressures that may exceed design limits and cause structural damage. Past studies have provided various insights in air-water interactions in closed pipes during rapid filling conditions, but the focus of the majority of these studies was to support the development and improvement of numerical models. Fewer experimental studies focused on the effect of geometric characteristics such as pipe diameter and length/diameter ratios, as well as systematic investigation of various air pocket volumes and filling flow rates. The present work addresses this knowledge gap, measuring pressure surge peaks and the damping of pressure surges following the first peak. In this investigation, kinetic energy and linear momentum dimensionless groups were analyzed as potential alternatives to represent peak surges as as well surge damping. Findings in this study provide further insight into parameters governing air-water surge magnitudes, and on the peak surge attenuation following sudden compression.
Peak Pressure Surges and Pressure Damping Following Sudden Air Pocket Compression
Vasconcelos, Jose G (Autor:in) / Hatcher, Thomas M
2017
Aufsatz (Zeitschrift)
Englisch
Peak Pressure Surges and Pressure Damping Following Sudden Air Pocket Compression
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