scholarly journals A Simulation of Four Stroke Marine Diesel Engines to Predict Internal Cylinder Characteristics

2021 ◽  
Vol 31 (5) ◽  
pp. 17-23
Keyword(s):  
Heat Release ◽  
Fuel Consumption ◽  
Heat Loss ◽  
Diesel Engines ◽  
Thermal Efficiency ◽  
Performance Parameters ◽  
First Law Of Thermodynamics ◽  
Brake Power ◽  
Marine Diesel ◽  
Power Peak

This paper introduces a simulation of four-stroke marine diesel engines. The submodel of a particular cylinder was carried out, based on the first law of thermodynamics, programmed by Matlab/Simulink program, which describes the relations among internal characteristics, including cylinder performance parameters, heat release, heat loss, and pressure. The heat release is based on the Wiebe function and the heat loss is based on the Woschni function to build submodels. From the result of the model, the indicated pressure of a single cylinder was taken, the brake power of the engine could be estimated through this pressure. The object of the simulation is a new engine, hence the technical documents and test records provided by the manufacturer are sufficient. The model got the input parameters from this and the key outputs of the model (for example the brake power, peak combustion pressure, specific fuel consumption) were compared with the test records to adjust and make it more accurate. These gaps were not over 5%, therefore, this model can be used to predict key complicated internal cylinder characteristics, for example, the pressure, temperature, and thermal efficiency of engines.

scholarly journals Prediction of fuel consumption for marine diesel in feasibility study of inland ship design

2020 ◽  
pp. 121-127
Author(s):  
А.Ю. Платов ◽  
Ю.И. Платов ◽  
О.Ю. Васильева
Keyword(s):  
Fuel Consumption ◽  
Diesel Engines ◽  
Analytical Approximation ◽  
Operating Costs ◽  
Marine Diesel Engine ◽  
Relative Speed ◽  
Inland Waterways ◽  
Brake Power ◽  
Inland Waterway ◽  
Marine Diesel

Предложен метод расчёта расхода топлива судового дизеля на разных режимах, для которого достаточно знания всего одного параметра – эффективной мощности двигателя. Потребность в таком методе обусловлена необходимостью оценки эксплуатационных расходов на ранних стадиях проектирования, когда эксплуатационные параметры судна неизвестны. Существующие методы оценки расхода топлива, требующие минимального набора параметров, не позволяют адекватно учитывать изменяющиеся условия плавания, что характерно для работы речных судов. Приведён анализ некоторых таких методов. На основе аппроксимации индикаторного к.п.д. построен аналитический метод, вычисляющий расход топлива судового дизеля при заданной мощности и относительной частоте вращения. Приводятся примеры расчёта расхода топлива для реального судна и стендовой характеристики судового дизеля. Построенный метод позволяет дополнить существующие методы расчёта ходкости новых судов и адекватно прогнозировать расход топлива в условиях эксплуатации судов на внутренних водных путях. A method for calculating the fuel consumption of marine diesel engines is proposed. It is enough for this to have only one parameter - the brake power. This method is necessary as there is the need to estimate operating costs in the early stages of ships design, when the ships parameters are unknown. Existing methods for estimating fuel consumption, requiring a minimum set of parameters, are not adequate for inland waterway conditions. An analysis of some of these methods is given. Based on approximation of indicator efficiency proposed analytical method for prediction of the fuel consumption of a marine diesel engine at a given power and relative speed is based on the analytical approximation of indicated thermal efficiency. Examples of predicting fuel consumption for the real ship and the marine diesel engines are given. The proposed method complements the existing methods for propulsion of new ships and to adequately predict of fuel consumption on inland waterways.

scholarly journals Optimization of the Performance of Marine Diesel Engines to Minimize the Formation of SOx Emissions

2020 ◽  
Vol 19 (3) ◽  
pp. 473-484
Author(s):  
Mina Tadros ◽  
Manuel Ventura ◽  
C. Guedes Soares
Keyword(s):  
Fuel Consumption ◽  
Diesel Engines ◽  
Engine Speed ◽  
Exhaust Emissions ◽  
Polynomial Equations ◽  
Marine Fuel ◽  
Marine Engines ◽  
Marine Diesel ◽  
Marine Applications ◽  
Generate Polynomial

Abstract Optimization procedures are required to minimize the amount of fuel consumption and exhaust emissions from marine engines. This study discusses the procedures to optimize the performance of any marine engine implemented in a 0D/1D numerical model in order to achieve lower values of exhaust emissions. From that point, an extension of previous simulation researches is presented to calculate the amount of SOx emissions from two marine diesel engines along their load diagrams based on the percentage of sulfur in the marine fuel used. The variations of SOx emissions are computed in g/kW·h and in parts per million (ppm) as functions of the optimized parameters: brake specific fuel consumption and the amount of air-fuel ratio respectively. Then, a surrogate model-based response surface methodology is used to generate polynomial equations to estimate the amount of SOx emissions as functions of engine speed and load. These developed non-dimensional equations can be further used directly to assess the value of SOx emissions for different percentages of sulfur of the selected or similar engines to be used in different marine applications.

Influence of the Indicator Channel and Indicator Valve on the Heat Release Characteristics of Medium Speed Marine Diesel Engines

2013 ◽  
Vol 588 ◽  
pp. 149-156 ◽  
Author(s):  
Stanisław Polanowski ◽  
Rafał Pawletko ◽  
Kazimierz Witkowski
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Diesel Engines ◽  
Diagnostic Information ◽  
Injection System ◽  
Indicator Diagram ◽  
Medium Speed ◽  
Marine Diesel ◽  
The Impact

Analysis of the indicator diagram is the basis of technical state evaluation of marine diesel engines. The indicator diagram contains a large amount of diagnostic information. A major problem for the diagnostic use of the indicator diagram is the pressure sensor location. Indicator channel and valve may introduce significant distortions in the resulting pressure. The paper presents results of research conducted on the medium speed laboratory engine Al 25/30. Pressure measurement (indication) was made by the sensor placed directly in the cylinder (instead of starting air valve), before the indicator valve (with special Kistler adapter) and on the indicator valve. Distortion of heat release characteristics for the sensor placed on the indicator valve is important, but it is estimated that diagnostic information is not erased. For medium speed engines is to be expected the use of a portable pressure sensors placed on the indicator valve. For this reason, further research is needed to assess the impact of channels and valves on different cylinders. During the research the course of heat release rate q and the heat released Q were determined. The curve of heat release rate q is a full equivalent to fuel injection pressure curve in the fuel pipes. It allows identification of the failure of the injection system. The curve of Q allows such determination and assessment of internal efficiency of the cylinder.

Use of Ethanol Based Oxygenates for Smoke Reduction in C.I. Engines

2005 ◽  
Author(s):  
Dhananjay B. Zodpe ◽  
Nishikant V. Deshpande
Keyword(s):  
Experimental Investigation ◽  
Fuel Economy ◽  
Diesel Engines ◽  
Thermal Efficiency ◽  
Substantial Reduction ◽  
Brake Thermal Efficiency ◽  
Gasoline Engines ◽  
Brake Power ◽  
Smoke Density ◽  
Harmful Effects

Diesel Engines have better fuel economy compared to gasoline engines. Society is now aware of various harmful effects of pollution and various researchers are trying to use fuel reformulation method to meet the forthcoming stringent air pollution norms for the diesel engines. This paper presents an experimental investigation on use of three different low price ethanol based oxygenate-diesel blends (oxygenate 4, 8 and 12% in blend) as an oxygen enriched fuel in diesel engine and its effect on brake thermal efficiency, smoke density and emissions of CO, HC, NOx etc is studied. It was observed that there is substantial reduction in the smoke density of exhaust gases and the observed reduction was found proportional to the mass of oxygen present in the blend. Marginal increase in NOx and brake thermal efficiency was observed and there was no significant change in the brake power of the engine.

Bayesian estimate of pre-mixed and diffusive rate of heat release phases in marine diesel engines

2016 ◽  
Vol 39 (5) ◽  
pp. 1835-1844 ◽  
Author(s):  
Marcelo A. Pasqualette ◽  
Diego C. Estumano ◽  
Fabiana C. Hamilton ◽  
Marcelo J. Colaço ◽  
Albino J. K. Leiroz ◽  
...  
Keyword(s):  
Heat Release ◽  
Diesel Engines ◽  
Bayesian Estimate ◽  
Marine Diesel ◽  
Rate Of Heat Release

Reduction of Heat Loss and Improvement of Thermal Efficiency by Application of “Temperature Swing” Insulation to Direct-Injection Diesel Engines

2016 ◽  
Vol 9 (3) ◽  
pp. 1449-1459 ◽  
Author(s):  
Yoshifumi Wakisaka ◽  
Minaji Inayoshi ◽  
Kenji Fukui ◽  
Hidemasa Kosaka ◽  
Yoshihiro Hotta ◽  
...  
Keyword(s):  
Heat Loss ◽  
Diesel Engines ◽  
Thermal Efficiency ◽  
Direct Injection ◽  
Temperature Swing

scholarly journals A Review of Comparative Study on The Effect of Hydroxyl Gas in Internal Combustion Engine (ICE) On Engine Performance and Exhaust Emission

2021 ◽  
Vol 87 (2) ◽  
pp. 1-16
Author(s):  
Amir Ridhuan ◽  
Shahrul Azmir Osman ◽  
Mas Fawzi ◽  
Ahmad Jais Alimin ◽  
Saliza Azlina Osman
Keyword(s):  
Fuel Consumption ◽  
Thermal Efficiency ◽  
Internal Combustion Engines ◽  
Engine Performance ◽  
Internal Combustion ◽  
Exhaust Emission ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Complete Combustion ◽  
Brake Power

This introductory study comes up with an innovative idea of using Hydroxyl gas as a fuel performance enhancer to reduce the natural sources and the overuse of fossil fuel resulting in increased pollution levels. Many researchers have used HHO gas to analyze gasoline and diesel in internal combustion engines. The main challenges of using HHO gas in engines have been identified as system complexity, safety, cost, and electrolysis efficiency. This article focuses on different performance reports and the emission characteristics of a compression ignition engine. As opposed to general diesel, this study found that using HHO gas improved brake power and torque. In all cases, an increase in braking thermal efficiency can be observed. This was due to the presence of hydrogen in HHO gas with higher calorific value than fossil fuels. At the same time, the fuel consumption unit of the engine was reduced, and the combined impact of hydrogen and oxygen helped to achieve complete combustion and improved the combustion capacity of the fuel when HHO gas was injected. The addition of HHO gas also improved the Brake Power (BP), Brake Torque (BT), Brake Specific Fuel Consumption (BSFC), and thermal efficiency while simultaneously reducing CO and HC formation. The rise in CO2 emissions represented the completion of combustion. Therefore, the usage of HHO gas in the Compression Ignition (CI) engine improved the engine performance and exhaust emissions.

A Study on the Numerical Prediction of Heat Release Rate and NOx Production in Medium-Speed Marine Diesel Engines

2003 ◽  
Author(s):  
Joo Youn Kim ◽  
Wook Hyeon Yoon ◽  
Ji Soo Ha
Keyword(s):  
Heat Release ◽  
Diesel Engines ◽  
High Speed ◽  
Digital Camera ◽  
Numerical Results ◽  
Spray Angle ◽  
Nox Formation ◽  
Time Resolved ◽  
Medium Speed ◽  
Marine Diesel

Prediction of the ROHR (rate of heat release) and NOx production in medium-speed marine diesel engines was investigated. The subject of this paper is qualitative and quantitative evaluation of the numerical results. FIRE code v8.1 was used to examine the behavior of spray and combustion phenomena in diesel engine. Wave breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation. The spray visualization was performed experimentally in the constant-volume high-pressure chamber to clarify numerical results on the spray characteristics of the spray angle and penetration. Time-resolved spray behaviors were captured by high-speed digital camera. The simulation results were tested with the experimental data of the real engine. Finally, with adjustment of some model constants, reasonable agreements between experimental and simulated results on the ROHR and NOx were shown.

Impact of Nitrogen Oxides Emission Reduction Methods on Specific Fuel Consumption of Marine Diesel Engines

2021 ◽  
Vol 23 ◽  
pp. 279-289
Author(s):  
Jerzy Herdzik
Keyword(s):  
Nitrogen Oxides ◽  
Fuel Consumption ◽  
Diesel Engines ◽  
Emission Reduction ◽  
Specific Fuel Consumption ◽  
Marine Diesel ◽  
Reduction Methods ◽  
The One ◽  
Tier 3 ◽  
The Cost

The paper has been presented the methods of nitrogen oxides emission reduction to fulfill the Tier 2 and Tier 3 requirements of the Annex VI of MARPOL Convention. It has been shown the development of marine two-stroke diesel engines and the change of nitrogen oxides emission from 1960 to 2000 and later up to 2020 after the implementation of NOx emission reduction methods. Specific fuel consumption before 2000, and as a prediction and given data in the manufacturers manuals for Tier 3 engines up to 2020, and as only a prediction up to 2030 has been analyzed and elaborated. Impact of nitrogen oxides reduction methods on the specific fuel consumption of the marine diesel engine has been evaluated. Additional emission of some gases to the atmosphere due to the implementation of reduction methods has been determined. EGR and SCR systems have got a lot of imperfections: required to install additional reduction systems (investment cost, required volume in the engine room), need maintenance and operation costs, produced wastes during treatment process. The estimated additional cost is about 0.8 USD/MWh of produced energy, taking into account only the cost of excessive used fuel. The whole increased cost may reach the level two-three times more due to cleaning systems investment costs, their operational cost and waste disposal. It has been the one of the reasons of worsening the transport effectiveness and competitiveness.

scholarly journals Contributions to the study of service characteristics of marine fuels

2018 ◽  
Vol XIX (1) ◽  
pp. 502-508
Author(s):  
Ali L
Keyword(s):  
Fuel Consumption ◽  
International Organizations ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Cylinder Liner ◽  
Operating Mode ◽  
Service Characteristics ◽  
Marine Engines ◽  
Marine Diesel ◽  
A Priority

Since the beginning, development of marine diesel engines was turned towards obtaining a low fuel consumption and the result has reflected in engines construction: increased bore and cylinder liner diameter, higher working pressures and lower piston speeds. Similar improvements have taken place in the supercharging system, innovative fuel injection technologies and changes in combustion pressures. Nowadays, the trend of development has changed, the concept of reducing NOx and SOx emissions became a priority in order to meet the limits imposed by international organizations. As a consequence, a series of changes in operating mode of marine engines was noticed but also several innovations appeared in the construction and development of marine engines.

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