Combustion simulation for naval diesel engine (original) (raw)

Studies of Combustion in Diesel Engine S

2013

Increasing computational power of modern computers, multi-dimensional Computational Fluid Dynamics (CFD) has found more and more applications in diesel engine research, design and development . Various successful applications have proven the reliability of using multi-dimensional CFD tools to assist in diesel engine research, design and development. By using CFD tools effectively it is easy to predict and analyse various details that are technically difficult like in cylinder process of diesel combustion, temperature & pressure contours, emission etc. prior to experimental tests to reduce the number of investigated parameters as well as time and thus costs. A multidimensional model was created and analysis of combustion was done using FLUENT, ANSYS 14.5 package and the 2D geometry was modelled and meshed using

A Numerical Analysis of the Combustion and the Study of the Exhaust Gases Resulting therefrom in the Marine Engines

Revista de Chimie, 2019

Maritime University of Constanta, Faculty of Naval Electromechanics, 104 Mircea cel Batran Str., 900663, Constanta, Romania Combustion inside diesel engine cylinders is the critical factor that controls the emission and combustion gases. Fuel injection in the engine cylinder is the decisive factor in the combustion of diesel engines and, consequently, combustion can be effectively controlled if the fuel injection process is efficiently controlled. From this perspective, the simulation of the complex processes of fuel injection in diesel engines in various situations can make a positive contribution to the optimization of marine propulsion systems. Also, correct dimensioning of the injection system components and its optimization and, implicitly, the combustion parameters, can have positive results in the context of reducing the impact of combustion gases of internal combustion engines, on the greenhouse effect and global warming.

High Quality Multi-Zone and 3D CFD Model of Combustion in Marine Diesel Engine Cylinder

Polish Maritime Research

The paper presents a 3D model of the processes taking place in the cylinder of a large 4-stroke marine engine. The model is based on CFD calculations performed on the moving mesh. The modelling range includes the full duty cycle (720° crankshaft position) and the complete geometry of the cylinder with inlet and exhaust ducts. The input data, boundary conditions and validation data were obtained by direct measurements on the real object. Fuel injection characteristics were obtained by Mie scattering measurements in a fixed-volume chamber. The modelling results have been validated in terms of the pressure characteristics of the engine’s cylinder within the entire range of its loads. The mean error did not exceed 1.42% for the maximum combustion pressure and 1.13% for the MIP (Mean Indicated Pressure). The model was also positively validated in terms of the O2 and NOx content of the exhaust gas. The mean error in this case was 1.2% for NOx fractions in the exhaust gas and 0.4% for O2 f...

Possibilities to Reduce Pollutant Emissions in Naval Diesel Engines

Mechanical Testing and Diagnosis

The combustion process is, by far, the most important and complex process that takes place in engines. Its importance is given by the fact that it provides the flow of energy used in the engine and is the source of all pollutant emissions, the efficiency of the engine being directly influenced by it. The mechanisms of combustion are particularly complex and are not fully known even today, the most difficult problem being the mechanisms of mixture formation and the chemistry of the combustion process. Over time, depending on the evolution of knowledge in the field and computer technology, various mathematical models have been developed, which have. Emission estimation and theoretical verification, in the first phase, of the solutions applicable to in-service enginescould greatly reduce research and production costs, given that there are a variety of engines onboard ships and measurements in operation are very difficult.

Model simulation of high power diesel engine exhaust gas pollutants

This paper tried to simulate the combustion inside the marine diesel engine using the newest computer methods and technologies with the result of a diverse and rich palette of solutions, extremely useful for the study and prediction of complex phenomena of the fuel combustion.

A comprehensive methodology for computational fluid dynamics combustion modeling of industrial diesel engines

International Journal of Engine Research, 2017

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Computational fluid dynamics modeling of combustion in heavy-duty diesel engines

International Journal of Engine Research, 2014

With the rapid depletion of high-yield copper mineral resources and the accumulation of secondary copper resources, the recycling of secondary copper is gaining popularity in the copper industry. A copper anode furnace, often used in copper recycling, usually relies on methane combustion to melt copper scraps. In this work, a computational fluid dynamics (CFD) model of pure oxy-methane combustion is established to investigate the combustion characteristics of the CH 4 /O 2 combustor in the copper anode furnace. The model is validated by comparing the simulation results with experimental measurements. The effects on flame length and temperature distribution are investigated under various fuel velocities, oxidizer velocities, and oxidizer temperatures. The results indicate that flame length and temperature distribution increase as the fuel velocity and oxidizer temperature increase, and decrease with the increase in oxidizer velocity. The flame length and temperature distribution always show an increasing trend with the increasing equivalence ratio. Based on the recycling capacity of the copper anode furnace, this validated CFD model can be used to optimize the operation parameters for controlling flame length and temperature distribution.

Modelling Diesel Combustion Mechanical Engineering Series

2013

The Internal Combustion (IC) engines play a dominant role in the fields of transportation of goods and passengers, agricultural and industry. They develop power by consuming precious fossil fuels and cause pollution. Among different types of engines, the direct-injection (DI) diesel engine exhibits the best fuel economy along with lowest engine-out emissions. Efforts have been put to improve exhaust emissions and fuel economy continuously. The complex task of improving IC engines, which have reached a higher degree of sophistication, can be achieved by combination of advanced experiments and computational studies. Modern methods of experimental investigations are being developed to provide more insight. The modelling of combustion engine processes is useful to carry out extensive parametric studies, rather than hardware development and experimentation. Depending on the various possible applications, different types of models for engine combustion processes have been developed. There...

Combustion process improvement in a marine diesel engine

Journal of maritime research, 2005

This paper presents the modifications carried out on a four years running medium-speed four-stroke propulsion diesel engine for improving its combustion process in order to avoid the damages produced at the piston crowns by the injected fuel jets. The works were carried out under instructions from Wi¤rtsili¤ NSD using a technology developed by this maker focused to decrease the emissions of soot particles and nitrogen oxides (NOx) without affecting the specific fuel consumption of new production engines and also for upgrading older engines still in operation. Various running parameters were checked before and after modifications while the ship was underway in normal sailing conditions. The values obtained were then compared to find out the results that might be inferred from such modifications.

Multidimensional CFD Simulation of a Diesel Engine Combustion: A Comparison of Combustion Models

The objective of this study is to simulate combustiuon process and pollutant formation in the combustion chamber of a DI diesel engine. The modelled results were validated by comparing predictions against corresponding experimental data for a diesel engine. The predicted and measured in-cylinder pressure and emission data were in good agreement. Computational fluid dynamics (CFD) is able to significantly reduce the number of experimental test and measurement and lower the development time and costs. Some parameter which are needed for CFD calculation must be achieved experimentally such as turbulence time scale constant. The CFD simulations demonstrated good agreement to the measured data. The results show that, applying appropriate constant of each combustion model including eddy break up model (Ebu), caracteristic timescale model (Ctm) and extended coherent flamelet model (Ecfm) causes the computaional result to be in agreement with experimental results. Furthermore the result show that the nearest prediction in comparasion with experimental result is by applying the Ecfm model.