COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF NOx AND OTHER POLLUTANTS IN THE MAN B&W 7S50MC MARINE ENGINE AND EFFECT OF EGR AND WATER ADDITION

2021 ◽  
Vol 155 (A2) ◽  
Author(s):  
M I Lamas ◽  
C G Rodríguez ◽  
H P Aas
Keyword(s):  
Experimental Data ◽  
Significant Contribution ◽  
Fast Method ◽  
Dynamics Analysis ◽  
Oxides Of Nitrogen ◽  
Water Addition ◽  
Marine Engine ◽  
Computational Fluid Dynamics Analysis ◽  
Marine Engines ◽  
Global Emissions

Marine engines represent a significant contribution to global emissions. In order to overcome this problem, a great attention was given to reduce their exhaust emissions in the last years, and marine engines have to adapt to regional, national and international restrictions. In this regard, the purpose of this paper is to develop a numerical model to study NOx (oxides of nitrogen) and other pollutants in engines. EGR and water addition were studied too as measures to reduce NOx. The main advantage of this study is that it provides a cheap and fast method to analyze emissions, contrary to experimental setups which are too expensive and laborious. Particularly, a commercial marine engine was analyzed and validated with experimental data. Results showed that increasing EGR and water addition leads to reduce NOx, but increase carbon monoxide and unburnt hydrocarbons due to an incomplete combustion.

Computational Fluid Dynamics Analysis of NOx and Other Pollutants in the Man B&W 7S50MC Marine Engine and Effect of EGR and Water Addition

2013 ◽  
Vol 155 (A2) ◽  
Keyword(s):  
Experimental Data ◽  
Significant Contribution ◽  
Fast Method ◽  
Dynamics Analysis ◽  
Oxides Of Nitrogen ◽  
Water Addition ◽  
Marine Engine ◽  
Computational Fluid Dynamics Analysis ◽  
Marine Engines ◽  
Global Emissions

Marine engines represent a significant contribution to global emissions. In order to overcome this problem, a great attention was given to reduce their exhaust emissions in the last years, and marine engines have to adapt to regional, national and international restrictions. In this regard, the purpose of this paper is to develop a numerical model to study NOx (oxides of nitrogen) and other pollutants in engines. EGR and water addition were studied too as measures to reduce NOx. The main advantage of this study is that it provides a cheap and fast method to analyze emissions, contrary to experimental setups which are too expensive and laborious. Particularly, a commercial marine engine was analysed and validated with experimental data. Results showed that increasing EGR and water addition leads to reduce NOx, but increase carbon monoxide and unburnt hydrocarbons due to an incomplete combustion.

Drying of Industrial Hollow Ceramic Brick: A Numerical Analysis Using CFD

2019 ◽  
Vol 391 ◽  
pp. 48-53 ◽  
Author(s):  
Morgana Vasconcellos Araújo ◽  
R.S. Santos ◽  
R. Moura da Silva ◽  
J.B. Silva do Nascimento ◽  
W.R. Gomes dos Santos ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Moisture Content ◽  
Dynamics Analysis ◽  
Unit Operation ◽  
Drying Process ◽  
Ceramic Brick ◽  
Temperature Distributions ◽  
Computational Fluid Dynamics Analysis ◽  
Good Agreement

The drying process can be defined how unit operation for removing water of one moist solid to an unsaturated gaseous phase due to heat transfer. Numerical simulation emerges like a tool that allows the reproduction of drying experiments using computers and suitable softwares. In this sense, this works aims to predict drying process of an industrial hollow ceramic brick inside the kiln using computational fluid dynamics analysis. For one drying temperature of 60°C, results of the drying and heating kinetics, and moisture content, velocity and temperature distributions are shown and analyzed. A comparison between predicted and experimental data of the moisture content and temperature of the brick along the process was done and a good agreement was obtained.

scholarly journals Numerical model to study the combustion process and emissions in the Wärtsilä 6L 46 four-stroke marine engine

2013 ◽  
Vol 20 (2) ◽  
pp. 61-66 ◽  
Author(s):  
M. I. Lamas ◽  
C. G. Rodríguez
Keyword(s):  
Combustion Process ◽  
Numerical Procedure ◽  
Temperature Fields ◽  
Exhaust Gas ◽  
Gas Composition ◽  
Marine Engine ◽  
Marine Engines ◽  
Marine Diesel ◽  
Computational Fluid Dynamics Cfd ◽  
Global Emissions

Abstract The aim of the present paper is to develop a computational fluid dynamics (CFD) analysis to study the combustion process in a four-stroke marine diesel engine, the Wartsila 6L 46. The motivation comes from the importance of emissions from marine engines in the global emissions, particularly for nitrogen oxides (NOx) and sulfur oxides (SOx). The pressure and temperature fields were obtained, as well as the exhaust gas composition. In order to validate this work, the numerical results were satisfactory compared with experimental ones, which indicates that this model is accurate enough to reproduce the fluid pattern inside the cylinder during the combustion process. Accordingly, the aim of future works is to use this numerical procedure to optimize the performance and reduce the emissions of the new marine engine designs.

Study on Manufacturing Tolerances for the Laminar Airfoil

2015 ◽  
Author(s):  
Jaehun Lee ◽  
Kyoung Jin Jung
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Computational Fluid Dynamics ◽  
Transition Model ◽  
Dynamics Analysis ◽  
Cfd Analysis ◽  
Computational Fluid Dynamics Analysis ◽  
Manufacturing Tolerances ◽  
Forward Facing Step ◽  
Good Agreement

The procedure to determine manufacturing tolerances for the laminar airfoil is explained using the CFD (computational fluid dynamics) analysis. This procedure is applied to a laminar airfoil for the tolerance of the forward-facing step and rearward-facing step. In the CFD analysis the Langtry-Menter SST Transition model is used to simulate a natural transition over the laminar airfoil. The computed tolerances showed good agreement with experimental data.

Murphree vapor efficiency prediction in SCC columns by computational fluid dynamics analysis

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mortaza Zivdar ◽  
Nasim Shahrouei
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Mass Transfer ◽  
Computational Fluid Dynamics ◽  
Liquid Film ◽  
Radial Distance ◽  
Dynamics Analysis ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Computational Fluid Dynamics Analysis

Abstract The spinning cone columns (SCC) are one of the distillation columns with increasing applications in food industries. The geometrical complexity and different flow regimes, besides the presence of moving parts, make the design and analysis of these columns challenging. Computational fluid dynamics analysis of SCC columns has shown promising results in analyzing the performance of these towers. The majority of previous works were pertinent to the air/water systems. Therefore, the application of these results to real systems is not very clear. In this study, the liquid film thickness, mass transfer coefficients, HETP, and Murphree vapor efficiency for the water/ethanol system have been predicted in a pilot-scale column. The results show that by increasing the radial distance from the axis, the thickness of the liquid film gradually decreases. This finding is also in consistent with the experimental results. The maximum thickness of the liquid film is <1 mm and is near the axis. Mass transfer coefficients in the liquid phase and in the gas phase increase slightly with increasing flow velocity and remain almost unchanged. The average values of these coefficients in the liquid and gas phases are 0.023 (s−1) and 1.21 (s−1), respectively. HETP increased with increasing gas velocity, the range of which varies between 0.092 and 0.375 m. Also, Murphree vapor efficiency at three rotational speeds of 550, 750, and 1000 rpm are predicted and compared with the experimental data. The results show that the efficiency has been decreased by increasing the strip ratio and increased by increasing the rotational speed. Minimum and maximum efficiencies obtained are 3.48 and 24.56% corresponding to strip ratio = 27.1% and RPM = 550 plus strip ratio = 9.15% and RPM = 1000, respectively. The predicted efficiencies are in a reasonable agreement (within 10.3%) with experimental data.

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