Three-dimensional Numerical Simulation of Smoke Motion in Fire of the Ship Engine Room with Multilayer Structure

摘要

The article at the beginning defines multilayer and monolayer structure based on the structural characteristics of ship engine room. The smoke filling motions in multilayer and monolayer structures are studied by employing filtered balance equations and the Smagorinsky subgrid-scale model.The article investigates the distribution of smoke with iso-concentration and the height of smoke layer. The research indicates that the spread speed and the spread area of smoke in the multilayer structure are greater than in the monolayer structure.The height variation of smoke layer is non-continuous in the multilayer structure and continuous in monolayer structure. The height of smoke layer decreased slowly within zone 1 in the multilayer structure, but the smoke fills the zone 1 more quickly in the monolayer structure.The examples demonstrate that the shortcomings of the structural hypothesis in traditional method badly affect the research results.The article suggests improvements for research of fires in ship.%Članak na početku definira zamisao o višeslojnim i jednoslojnim strukturnim svojstvima brodske strojarnice. Za proučavanje širenja dima u višeslojnim i jednoslojnim strukturama korištena je jednadžba filtrirane ravnoteže i Smagorinskijev model. Članak dalje proučava raspodjelu dima iste koncentracije te visine slojeva dima. Pokazuje se da su brzina širenja i površina širenja dima u višeslojnim strukturama veće nego u jednoslojnim strukturama. Promjene slojeva dima po visini su za višeslojne strukture diskontinuirane, a kontinuirane za jednoslojne strukture. Kod višeslojnih se struktura visina slojeva dima u području 1 smanjuje polako dok se kod jednoslojnih struktura smanjuje brže. Primjeri ukazuju da nedostatci strukturne hipoteze kod primjene tradicionalnoga pristupa izazivaju znatna odstupanja. Članak stoga predlaže poboljšanja za izučavanje požara na brodovima.