TY - JOUR

T1 - An investigation of exhaust smoke dispersion for a generic frigate by numerical analysis and experiment

AU - Dobrucali, Erinc

AU - Ergin, Selma

N1 - Publisher Copyright:
© IMechE 2017.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - The effects of efflux velocity, operational conditions, stack geometry, and buoyancy on the exhaust dispersion for a generic frigate are investigated numerically. The conservation of energy, momentum, mass, species, and turbulence equations have been solved using the finite volume method. It is found that the exhaust smoke dispersion is affected by the efflux velocity, operational conditions, buoyancy, and turbulence, as well as the geometry of the stack. The momentum of the exhaust gases and the plume height increase as the velocity ratio increases. The results for the slow ahead operation condition show that the buoyancy effect is the strongest, and the plume height is minimum for this case. The exhaust temperatures and velocity values for the full ahead operation are found to be the highest. However, the plume height for this case is not maximum. This may be attributed to the high turbulence levels for this case. It is found that the effect of stack geometry on the exhaust smoke dispersion is not significant for the geometries considered in the study. The computations are validated with the flow visualization tests carried out in a wind tunnel. The agreement between the numerical and experimental results is found to be good.

AB - The effects of efflux velocity, operational conditions, stack geometry, and buoyancy on the exhaust dispersion for a generic frigate are investigated numerically. The conservation of energy, momentum, mass, species, and turbulence equations have been solved using the finite volume method. It is found that the exhaust smoke dispersion is affected by the efflux velocity, operational conditions, buoyancy, and turbulence, as well as the geometry of the stack. The momentum of the exhaust gases and the plume height increase as the velocity ratio increases. The results for the slow ahead operation condition show that the buoyancy effect is the strongest, and the plume height is minimum for this case. The exhaust temperatures and velocity values for the full ahead operation are found to be the highest. However, the plume height for this case is not maximum. This may be attributed to the high turbulence levels for this case. It is found that the effect of stack geometry on the exhaust smoke dispersion is not significant for the geometries considered in the study. The computations are validated with the flow visualization tests carried out in a wind tunnel. The agreement between the numerical and experimental results is found to be good.

KW - buoyancy effect

KW - computational fluid dynamics

KW - Exhaust dispersion

KW - frigate

KW - stack geometry

UR - http://www.scopus.com/inward/record.url?scp=85042112228&partnerID=8YFLogxK

U2 - 10.1177/1475090217742240

DO - 10.1177/1475090217742240

M3 - Article

AN - SCOPUS:85042112228

SN - 1475-0902

VL - 233

SP - 310

EP - 324

JO - Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment

JF - Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment

IS - 1

ER -