A Wind Tunnel Study on the Interaction of Hot Exhaust from the Funnel with the Superstructure of a Naval Ship

Vijayakumar, R.; Seshadri, V.; Singh, Sumer; Kulkarni, P.R.

doi:10.1109/oceanskobe.2008.4530948

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Kulkarni et.al. and Vijayakumar et al studied experimentally the interaction between the naval ship exhaust and the funnel air wake within a setup wind tunnel [7][8]. In order to investigate the impacts on the exhaust dispersion, they implemented four different upper deck layouts, 2 different stack geometries and 2 different velocity ratios in the flow visualization tests.…”

Section: Introductionmentioning

confidence: 99%

Flow visualization and analytical study on the exhaust gas diffusion of a frigate

Dobrucali

2021

Pomorstvo (Online)

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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.

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Section: Introductionmentioning

confidence: 99%

Flow visualization and analytical study on the exhaust gas diffusion of a frigate

Dobrucali

2021

Pomorstvo (Online)

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“…[11][12][13][14][15][16][17][18][19][20][21][22][23] Besides all these numerical investigations, there are few experimental studies on the exhaust smoke dispersion and the interaction between the exhaust gases and the superstructure of the ship in the literature. For example, Kulkarni et al and Vijayakumar et al 25 investigated the interaction between the exhaust of a naval ship and air wake of its funnel using a wind tunnel. Four different topside configurations with two different funnels were considered in their experimental study.…”

Section: Introductionmentioning

confidence: 99%

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

Dobrucali

Ergin

2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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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.

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“…In order to reduce the emissions from marine diesel engines and the hydrocarbon fuel market dependence, a lot of research has been targeted either to the combustion process improvement (fuel chemical treatment, or alternative fuels) or to the efficiency increase of the electrogenerating systems, by initiating ad hoc electrical drive systems, propulsion systems and electric network configurations, or by introducing energy saving and regenerative systems, as well as technologies for renewable energy sources [1,[4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Incorporating power converters for energy saving marine applications

Papanikolaou¹,

Kyritsis

Loupis³

2014

2014 International Conference on Electrical Machines (ICEM)

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This paper presents two different approaches for the incorporation of commercial inverters in ships' low voltage electric network, either for the exploitation of renewable sources such as the sun and the wind, or for energy regeneration from the exhaust gases heat. Both solutions contribute to the reduction of CO2 emissions as well as to fuel consumption reduction. The inverters as well as all the necessary installation components should meet the requirements for Safety of Life at Sea (SOLAS) as they are reported on IEC 60092 or IEEE 45 series and are a part of ABS rules -approved from national and international register of shipping organizations.

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A Wind Tunnel Study on the Interaction of Hot Exhaust from the Funnel with the Superstructure of a Naval Ship

Cited by 6 publications

References 6 publications

Flow visualization and analytical study on the exhaust gas diffusion of a frigate

Flow visualization and analytical study on the exhaust gas diffusion of a frigate

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

Incorporating power converters for energy saving marine applications

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