Numerical analysis of the scavenge flow and convective heat transfer in large two-stroke marine diesel engines

Sigurdsson, Eythor; Ingvorsen, Kristian Mark; Jensen, Michael Vincent; Mayer, Stefan; Matlok, Simon; Walther, Jens Honoré

doi:10.1016/j.apenergy.2014.02.036

Cited by 50 publications

(39 citation statements)

References 23 publications

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“…The heat transfer from the cylinder to the cooling water was modeled as a combined convection-radiation type, Equation (5). Previous investigations [40] demonstrated the accuracy of this type of boundary condition in comparison with adiabatic or constant temperature:…”

Section: Numerical Modelmentioning

confidence: 92%

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Galdo

Castro-Santos

Vidal³

2020

JMSE

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This work analyzes NO x reduction in a marine diesel engine using ammonia injection directly into the cylinder and compares this procedure with water injection. A numerical model based on the so-called inert species method was applied. It was verified that ammonia injection can provide almost 80% NO x reduction for the conditions analyzed. Furthermore, it was found that the effectiveness of the chemical effect using ammonia is extremely dependent on the injection timing. The optimum NO x reduction was obtained when ammonia is injected during the expansion stroke, while the optimum injection timing using water is near top dead center. Chemical, thermal, and dilution effects of both ammonia and water injection were compared. The chemical effect was dominant in the case of ammonia injection. On the other hand, water injection reduces NO x through dilution and, more significantly, through a thermal effect.that the main factors that influence NO x formation are the temperatures reached in the combustion process and the amount of time in which the combustion gases remain at high temperatures [5][6][7]. Based on this, primary measures focus on addressing these factors and reducing the concentrations of oxygen and nitrogen [8,9]. Well-known primary measures are exhaust gas recirculation (EGR), Miller timing, common rail, modification of injection and other parameters of the engine, and water addition. Water can be introduced as a fuel-water emulsion injected via the fuel valve, through separate nozzles or by humidifying the scavenge air. Despite the extensive research on primary measures along the recent years, a procedure to reduce NO x without decreasing emission of other pollutants and/or consumption has not effectively been developed. In this regard, secondary measures reduce NO x from the flue gas through downstream cleaning techniques. Many applications have been undertaken to reduce NO x by selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). The disadvantages of SCR are its price, poor durability of catalysts, and deposition of particulate on the catalyst. These disadvantages are not present in SNCR, but this procedure is limited to a narrow temperature range with optimal temperatures that are much higher than those characteristic of flue gas from diesel engines [10]. This limitation constitutes a drawback for practical applications in exhaust gases from diesel engines. As SCR reducing agents, ammonia (NH 3 ), urea, and cyanuric acid have been extensively employed. SNCR using ammonia, urea, and cyanuric acid are known as DeNO x [11,12], NO x OUT [13,14], and RAPRENO [15-17], respectively. Between these, this work focuses on NO x reduction using ammonia. The NO x reduction capabilities of ammonia were discovered in the seventies by Lyon [18], who found that ammonia selectively reduces NO x without a catalyst over the temperature range of 1100-1400 K. Typical exhaust gas temperatures from marine engines, around 300-450 • C [19], remain considerably lower than this optimal temperature ra...

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Section: Numerical Modelmentioning

confidence: 92%

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Galdo

Castro-Santos

Vidal³

2020

JMSE

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“…Lamas [12] adopted 7S50MC scavenging pressure test data of MAN B&W and compared with the calculation results of ANSYS FLUENT, and good results are obtained. While Sigurdsson [13] compared the test data about the test model 4T50ME-X of MAN B&W with predicted results of Star CD, pressure error on the check point is 14%.While changing the equation of state to real gas state equation model, pressure error on the check point is still up 6.5%.…”

Section: Advances In Engineering Research Volume 119mentioning

confidence: 99%

Numerical Simulation of Scavenging Process of Large 2-Stroke Marine Diesel Engine

Fa-ming¹,

Jin²

2017

Proceedings of the 2017 2nd International Conference on Automatic Control and Information Engineering (ICACIE 2017)

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Abstract-Computational Fluid Dynamics (CFD) is of great importance for R&D of Large 2-Stroke Marine Diesel Engine. The CFD software ANSYS FLUENT was adopted to calculate the scavenging process of a large 2-stroke marine diesel engine MAN B&W S60MC-C6 and the obtained pressure trace was compared with the shop test data. The swirl flow field was analyzed on the achieved satisfactory in-cylinder pressure agreement. This provides a good reference for the application of CFD to the optimization of large 2-stroke marine diesel engine scavenge process.

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“…One with approximately 150,000 cells denoted "coarse" and one with approximately 237,000 cells denoted "medium". The reference mesh of 304,000 cells is referred to as "fine" [27]. The effect of mesh resolution is presented by comparing the radial profiles of the tangential velocity as shown in Figure 6.…”

Section: Model Validationmentioning

confidence: 99%

Effects of Scavenging System Configuration on In-Cylinder Air Flow Organization of an Opposed-Piston Two-Stroke Engine

Zhao

Zhang

et al. 2015

Energies

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Abstract:In-cylinder air flow is very important from the point of view of mixture formation and combustion. In this direction, intake chamber structure and piston crown shape play a very crucial role for in-cylinder air pattern of opposed-piston two-stroke (OP2S) engines. This study is concerned with the three-dimensional (3D) computational fluid dynamics (CFD) analysis of in-cylinder air motion coupled with the comparison of predicted results with the zero-dimensional (0D) parametric model. Three configurations viz., a flat piston uniform scavenging chamber, a flat piston non-uniform scavenging chamber and a pit piston non-uniform scavenging chamber have been studied. 0D model analysis of in-cylinder air flow is consistent with 3D CFD simulation. It is concluded that a pit piston non-uniform scavenging chamber is the best design from the point of view of tumble ratio, turbulent kinetic energy and turbulent intensity, which play very important roles in imparting proper air motion. Meanwhile a flat piston uniform scavenging chamber can organize a higher swirl ratio and lower tumble ratio which is important to improve the scavenging process.

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Numerical analysis of the scavenge flow and convective heat transfer in large two-stroke marine diesel engines

Cited by 50 publications

References 23 publications

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Numerical Simulation of Scavenging Process of Large 2-Stroke Marine Diesel Engine

Effects of Scavenging System Configuration on In-Cylinder Air Flow Organization of an Opposed-Piston Two-Stroke Engine

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