Experiments and Considerations to Avoid Smoke Nuisance

Abstract

To avoid smoke nuisance, funnel must be protruded outside the turbulent zone gene-rated above compass bridge deck. Size of turbulent zone depends on the shape of wheel house and / or accommodation, and is different for each ship. Naval architects and researchers have carried out various systematic wind tunnel tests using models over years, and investigated many methods and formulas to estimate size of turbulent zone. However, because these methods and formulas are not applicable to recent less air resistance type deck houses, we carried out wind tunnel tests using their models and measured sizes of turbulent zones. In addition, we have investigated effects of fore and aft structures on turbulent zone. As a result, we have obtained a pair of experimental equations giving sizes of turbulent zones for less air resistance type deck houses and effects of fore and aft structures, and confirmed that these equations are applicable to actual ships.