Open AccessFlow visualization and analytical study on the exhaust gas diffusion of a frigate
Author(s) -
Erinç Dobrucalı
Publication year - 2021
Publication title -
pomorstvo
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.197
H-Index - 8
eISSN - 1846-8438
pISSN - 1332-0718
DOI - 10.31217/p.35.2.13
Subject(s) - plume , flow visualization , wind tunnel , marine engineering , momentum (technical analysis) , water tunnel , diffusion , flow (mathematics) , mechanics , smoke , environmental science , dispersion (optics) , exhaust gas , visualization , meteorology , aerospace engineering , engineering , vortex , physics , mechanical engineering , waste management , thermodynamics , optics , finance , economics
Wind tunnel flow visualization tests were conducted to analyse the efflux velocity impacts and the yaw angle on the smoke dispersion of the exhaust for a generic frigate. An analytical study was also implemented to obtain the exhaust plume trajectories. The 1/100 scale generic frigate, having a platform for helicopters on the aft of the ship, was built and employed during the experimental study. The forward and astern cruises of the frigate were considered. It is found that the plume height and the exhaust gases momentum increase with the velocity ratio. The problem of smoke nuisance was observed for the ratios with low velocity such as K=0.2. The plume was also directed towards the helicopter platform when the yaw angles are higher than 10°. The experimental results are compared with the analytical solutions for three different velocity ratios. The compliance between the experimental and analytical results is found to be consistent.