Investigation of flow phenomena in air–water safety relief valves by means of a discontinuous Galerkin solver

摘要: Safety valves are mechanical devices designed to protect a system (typically pressure vessel) against excessive pressure; the operational behavior of spring loaded safety is governed by difference between reclosing force operated and opening field acting on device surface. The resulting flow path inside valve body very complicated due sharp edges sudden curvature characterizing geometry, complex phenomena like shock waves supersonic expansions occurring when operating with compressible flows. As consequence, design relief an hard task. In some cases required operate both incompressible flows, e.g. in shell-type water–gas heat exchangers, but indeed may significantly vary different fluids. Since performance strongly dependent fluid properties, particular trim (i.e. path) thus order guarantee proper functional characteristics working either gases or liquids. In this work accurate Discontinuous Galerkin (DG) solver applied compute higher-order approximations within 2″ J 3″ (according API 526) for steam–water double protection. investigation aims at clarifying role played viscous losses compressibility effects discharge capability air water. main features code used flows relying fully implicit high-order DG discretization coupled RANS k–ω turbulence model equations also described.