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 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 The influence of fuel injection pump malfunctions of a marine 4-stroke Diesel engine on composition of exhaust gases

2016 ◽  
Vol 167 (4) ◽  
pp. 53-57
Author(s):  
Joanna LEWIŃSKA
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Thermodynamic Parameters ◽  
Laboratory Study ◽  
Fuel Injection ◽  
Marine Diesel Engine ◽  
Fuel Pump ◽  
Engine Cylinder ◽  
Marine Diesel ◽  
Fuel Leakage

The article presents results of a laboratory study on exhaust gas emission level from a marine diesel engine. The object of the laboratory study was a four-stroke marine diesel engine type Al 25/30 Sulzer, operated at a constant speed. The examination on the engine was carried out according to regulations of the Annex VI to MARPOL 73/78 Convention. The laboratory study consisted of 3 observations: the engine assumed to be operating without malfunctions, delay of the fuel injection by 5° of crankshaft angle in the second engine cylinder, and the leakage of the fuel pump on the second engine cylinder. Additionally, parameters of fuel consumption and thermodynamic parameters of the marine engine were measured during the research. Simulated malfunctions caused changes in total weighed NOx, CO, and CO2 emissions for all considered engine loads. All simulated malfunctions caused a small change in measured thermodynamic parameters of the engine. The engine operation with the delayed fuel injection and the fuel leakage in the fuel pump in one cylinder caused a decrease of NOx and CO emission level. Fuel leakage in the fuel pump causes the CO2 emission to decrease only at low engine load. Calculations of the weighed specific fuel consumption present a 1-2% change in the engine efficiency.

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.

Computer aided study of the transient performances of a highly rated sequentially turbocharged marine diesel engine

1998 ◽  
Vol 212 (3) ◽  
pp. 185-196 ◽  
Author(s):  
X Tauzia ◽  
J F Hetet ◽  
P Chesse ◽  
G Crosshans ◽  
L Mouillard
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Diesel Engines ◽  
Marine Diesel Engine ◽  
Computer Aided ◽  
Compressor Surge ◽  
Marine Diesel ◽  
Valve Opening ◽  
Transient Phases ◽  
Good Agreement

The sequential turbocharging technique described in this paper leads to an improvement in the operations of highly rated diesel engines, in particular at part loads (better air admission). However, transient phases such as a switch from one turbocharger to two turbochargers can be difficult, mainly because of the inertia of the turbochargers. In order to simulate the dynamics of turbocharged diesel engines, the SELENDIA software has been extended. When applied to two different engines (12 and 16 cylinders), the program shows good agreement with the experimental data. Moreover, the compressor surge has been investigated during faulty switch processes. The software has then been used for predictive studies to evaluate the possibility of adapting sequential turbocharging to a 20-cylinder engine and to calibrate the optimum switching conditions (air and gas valve opening timing).

scholarly journals Computational and experimental determination of flame radiation parameters in the combustion chamber of a marine diesel engine

2020 ◽  
pp. 98-102
Author(s):  
Б.И. Руднев ◽  
О.В. Повалихина
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Combustion Chamber ◽  
Experimental Method ◽  
Diesel Engines ◽  
Flame Temperature ◽  
Marine Diesel Engine ◽  
Gas Temperature ◽  
Flame Radiation ◽  
Marine Diesel

Температура пламени и степень черноты определяют его собственное излучение. Однако оценка указанных параметров на стадии проектирования судовых дизелей представляет собой трудную и еще пока нерешенную проблему. Последнее обусловливается сложностью достоверного математического моделирования процесса сгорания топлива в дизельных двигателях и весьма высокой стоимостью экспериментальных исследований в этой области. Целью данной статьи является разработка расчетно-экспериментального метода определения параметров излучения пламени в камере сгорания судового дизеля 6 ЧН 24/36. Показано, что оценка величины температуры пламени в камере сгорания в функции угла поворота коленчатого вала может быть выполнена по температуре газов, найденной из экспериментальной или расчетной индикаторной диаграммы и специального параметра. Последний определяется на основании зависимости, полученной путем обобщения экспериментальных данных по измерениям температуры пламени на ряде дизельных двигателей. Представлены результаты по температуре пламени для судового дизеля 6 ЧН 24/36, полученные с использованием разработанного расчетно-экспериментального метода. Установлено, что с ростом нагрузки температура пламени возрастает. При этом в диапазоне изменения нагрузки дизеля от 50% до 100% от номинальной мощности увеличение температуры пламени примерно в два раза превышает увеличение температуры газов. Использование полученных результатов для оценки собственных потоков излучения пламени в камере сгорания судового дизеля 6 ЧН 24/36 и сопоставление их с известными экспериментальными данными показало сходимость в пределах 10 – 15%. The flame temperature and radiating power are determined with its own radiation. However, the assessment of these parameters at the design stage of marine diesel engines is a complicated and still unsolved problem. The latter is due to the complexity of reliable mathematical modeling of the fuel combustion process in diesel engines and the very high cost of experimental research in this area. The purpose of this article is to develop a computational and experimental method for determining the parameters of flame radiation in the combustion chamber of marine diesel engine 6 ChN 24/36. It is shown that the estimation of the value of flame temperature in the combustion chamber as a function of the crankshaft rotation angle can be performed using the gas temperature found from the experimental or calculated indicator diagram and a special parameter. The latter is determined on the basis of the dependence obtained by generalizing experimental data of the flame temperature measurements at a number of diesel engines. The results on the flame temperature for marine diesel engine 6 ChN 24/36, obtained using the developed computational and experimental method, are presented. It has been found that the flame temperature increases with increasing load. At the same time, in the range of diesel load variation from 50% to 100% of the nominal power, an increase in the flame temperature is approximately twice more than an increase in the gas temperature. The use of the results obtained to assess the intrinsic fluxes of flame radiation in the combustion chamber of marine diesel engine 6 ChN 24/36 and their comparison with the known experimental data showed the convergence within 10 - 15%.

An Experimental Study on Fuel Economy Improvement of a Marine Diesel Engine Using a Sequential Turbocharging System

2018 ◽  
Author(s):  
Hechun Wang ◽  
Xiannan Li ◽  
Yinyan Wang ◽  
Hailin Li
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Diesel Engines ◽  
Engine Speed ◽  
Single Stage ◽  
Marine Diesel Engine ◽  
Nox Emissions ◽  
Engine Operation ◽  
Marine Diesel ◽  
High Torque

Marine diesel engines usually operate on a highly boosted intake pressure. The reciprocating feature of diesel engines and the continuous flow operation characteristics of the turbocharger (TC) make the matching between the turbocharger and diesel engine very challenging. Sequential turbocharging (STC) technology is recognized as an effective approach in improving the fuel economy and exhaust emissions especially at low speed and high torque when a single stage turbocharger is not able to boost the intake air to the pressure needed. The application of STC technology also extends engine operation toward a wider range than that using a single-stage turbocharger. This research experimentally investigated the potential of a STC system in improving the performance of a TBD234V12 model marine diesel engine originally designed to operate on a single-stage turbocharger. The STC system examined consisted of a small (S) turbocharger and a large (L) turbocharger which were installed in parallel. Such a system can operate on three boosting modes noted as 1TC-S, 1TC-L and 2TC. A rule-based control algorithm was developed to smoothly switch the STC operation mode using engine speed and load as references. The potential of the STC system in improving the performance of this engine was experimentally examined over a wide range of engine speed and load. When operated at the standard propeller propulsion cycle, the application of the STC system reduced the brake specific fuel consumption (BSFC) by 3.12% averagely. The average of the exhaust temperature before turbine was decreased by 50°C. The soot and oxides of nitrogen (NOx) emissions were reduced respectively. The examination of the engine performance over an entire engine speed and torque range demonstrated the super performance of the STC system in extending the engine operation toward the high torque at low speed (900 to 1200 RPM) while further improving the fuel economy as expected. The engine maximum torque at 900 rpm was increased from 1680Nm to 2361 Nm (40.5%). The average BSFC over entire working area was improved by 7.4%. The BSFC at low load and high torque was significantly decreased. The application of the STC system also decreased the average NOx emissions by 31.5% when examined on the propeller propulsion cycle.

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.

MV “CRYSTAL STAR” Diesel Turbocharger Surge Cause Analysis and Troubleshooting

2014 ◽  
Vol 672-674 ◽  
pp. 1562-1567
Author(s):  
Bin Li ◽  
Shou Jun Zhang
Keyword(s):  
Working Conditions ◽  
Diesel Engines ◽  
Preventive Measures ◽  
Fuel Oil ◽  
Marine Diesel Engine ◽  
Exhaust Gas ◽  
Oil Consumption ◽  
Cause Analysis ◽  
Shipping Costs ◽  
Marine Diesel

Currently shipping costs are increasing sharply due to the rising oil prices. In order to reduce shipping costs, most low-speed two-stroke diesel engines run at low speeds to reduce fuel oil consumption, and this measure might result turbocharger surge. For modern marine diesel engines, the exhaust gas turbochargers are becoming more and more important; their working conditions have a direct impact on the performance of diesel engines, consequently affecting the operation of the ship. Surge will fail a turbocharger to achieve the supercharging ratio, damage the turbocharger components and even lead to a damage accident of the whole turbocharger. Therefore, a good understanding of the reasons for marine diesel engine turbocharger surge will help to prevent and eliminate turbocharger surge in operation. This paper is to make an analysis on the special surge mechanism occurred to the turbocharger on MV "Crystal Star", and propose some appropriate supervisory and preventive measures against the problem.

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