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THE INTERACTION OF SPRINKLER SPRAYS AND FIRE PLUMES

dc.contributor.advisorMarshall, Andre Wen_US
dc.contributor.authorLink, Eric D.en_US
dc.date.accessioned2017-06-22T06:20:48Z
dc.date.available2017-06-22T06:20:48Z
dc.date.issued2017en_US
dc.identifierhttps://doi.org/10.13016/M2PP3W
dc.identifier.urihttp://hdl.handle.net/1903/19471
dc.description.abstractThe critical factor for successful suppression using fire sprinklers is the delivery of water to burning surfaces. Water delivery is dependent on initial spray characteristics and subsequent spray interactions with the opposing fire plume, which can deflect or reverse the sprinkler spray away from the targeted fire source. Measurements provide a comprehensive validation data set for computational fluid dynamics (CFD) spray models, as well as insight and engineering guidance to the spray-plume interaction important in fire sprinkler applications. An experimental facility consisting of an array of four sprinklers, similar to that of typical suppression system installations, is used to evaluate both quiescent spray dispersion and spray-plume interaction conditions. A 0.2 m x 0.2 m centrally located forced air jet, with velocities ranging up to 4 m/s is used (in place of a fire) to provide a well-characterized, repeatable kinematic challenge to the spray. Measurements include quiescent case spray dispersion and local volume flux delivery to the plume source to evaluate spray penetration through the plume. Additional measurements include air jet centerline drop velocity and drop size at variable source injection velocities to evaluate plume penetration behavior. These spray dispersion experiments capture the dominant transport physics and kinematic behavior of the spray plume interaction. Scaling analysis of the spray plume interaction is explored for two regimes of spray penetration; individual drop action and group spray action. In the individual drop action regime the droplets have a negligible effect on the plume and penetration scales with the ratio of drop terminal velocity to plume velocity. In the group action regime, a spray work criterion is proposed, accounting for drag interactions with the plume. The complete set of spray dispersion and plume penetration measurements comprise a data set of high resolution and well-characterized boundary conditions (including detailed initial spray measurements for each sprinkler in the array) useful for CFD validation.en_US
dc.language.isoenen_US
dc.titleTHE INTERACTION OF SPRINKLER SPRAYS AND FIRE PLUMESen_US
dc.typeDissertationen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentMechanical Engineeringen_US
dc.subject.pqcontrolledEngineeringen_US
dc.subject.pquncontrolledfireen_US
dc.subject.pquncontrolledshadowgraphyen_US
dc.subject.pquncontrolledspray penetrationen_US
dc.subject.pquncontrolledspray-plume interactionen_US
dc.subject.pquncontrolledsuppressionen_US
dc.subject.pquncontrolledvalidationen_US


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