scholarly journals Affections of Turbine Nozzle Cross-Sectional Area to the Marine Diesel Engine Working

Naše more ◽  
2021 ◽  
Vol 68 (2) ◽  
pp. 65-73
Author(s):  
Do Duc Luu ◽  
◽  
Nguyen Quang Vinh
Keyword(s):  
Diesel Engine ◽  
Cross Sectional Area ◽  
Fuel Oil ◽  
Marine Diesel Engine ◽  
Sectional Area ◽  
Oil Consumption ◽  
Cross Sectional ◽  
Exhaust Temperature ◽  
Working Cycle ◽  
Marine Diesel

After a long period of use, some important technical parameters of the main marine diesel engines (MDE) gradually become worse, such as the turbine speed, intake pressure, exhaust temperature, engine power, and specific fuel oil consumption (SFOC). This paper studies the affections of the turbine nozzle cross-sectional area (AT) to MDE and presents a method of AT adjustment to improve the performances of MDE. A mathematical model of an engine was built based on the existent engine construction and the theory of the diesel engine working cycle and the simulation was programmed by Matlab/Simulink. This simulation model accuracy was evaluated through the comparison of simulation results and experimental data of the MDE. The accuracy testing results were acceptable (within 5%). The influences of AT on the engine working parameters and the finding optimization point were conducted by using the simulation program to study. The predicted optimization point of the nozzle was used to improve the engine’s performances on board. The integration of the simulation and experiment studies showed its effectiveness in the practical application of the marine diesel engine field.

The Performance Analysis on Cooling Capacity of the Air Cooler for a Turbocharged 4-Stroke Marine Diesel Engine

2010 ◽  
Vol 29-32 ◽  
pp. 2108-2113
Author(s):  
Jia Liang Huang ◽  
Dan Wang ◽  
Guo Hao Yang
Keyword(s):  
Numerical Calculation ◽  
Diesel Engine ◽  
Cooling Capacity ◽  
Fuel Oil ◽  
Marine Diesel Engine ◽  
Oil Consumption ◽  
Work Cycle ◽  
Marine Diesel ◽  
Air Cooler ◽  
Influent Factors

Air cooler system is aimed at increasing the density of pressurized air to reduce the work cycle of the average cylinder temperature and exhaust temperature, to prevent excessive thermal load on components, effectively inhibit the NOx emissions. Daihastu 6PSHdM-26H diesel engine, which is a type of 4-stroke medium-speed turbocharged marine diesel engine, is widely used in ocean-going ships. Considering its working principle and structural properties, this paper describes some roles and running influent factors of air cooler, establishes its physical and mathematical models in order to set up the numerical calculation method, gets the relative parameters of deterioration of cooling capacity in an air-cooler. And then points out that the influence of deteriorated heat transfer in an air-cooler for the effective fuel oil consumption of marine diesel engine is dual , that is, the increasing of air flow resistance and dirt as well as decreasing of cool capacity, the effective fuel oil consumption is rising. On the basis of the numerical calculation of air cooler, these results not only provides some theory support to solve deteriorated of operational performance for heavy-duty 4-stroke marine diesel engine, but also decrease the dependence degree for a marine engineer, then make it possible to scientific manage modern big-scale automatic engine room and improve the reliability of marine propulsion power plant.

Particulate Emissions From a Two-Stroke Marine Diesel Engine Operated With Heavy Fuel Oil

2002 ◽  
Author(s):  
Tatsuro Tsukamoto ◽  
Kenji Ohe ◽  
Hiroshi Okada
Keyword(s):  
Diesel Engine ◽  
Sulfur Content ◽  
Diesel Oil ◽  
Fuel Oil ◽  
Particulate Emissions ◽  
Marine Diesel Engine ◽  
Heavy Fuel Oil ◽  
Particulate Emission ◽  
Marine Diesel ◽  
Test Engine

In these years, a problem of air pollution in a global scale becomes a matter of great concern. In such social situation, diesel engines are strongly required to reduce the NOx and particulate emission in the exhaust gas. In this paper, measurements of particulate emissions from a low speed two-stroke marine diesel engine were conducted with several kinds of diesel oil and a heavy fuel oil, to know the characteristics of particulate emissions at the present situation. The effects of engine load and sulfur content of the fuel on the particulate emission have been examined. The particulate emission from the test engine was measured by partial-flow dilution tunnel system, and particulate matter collected on the filter was divided into four components, SOF (soluble organic fraction), sulfate, bound water and dry soot, by Soxlet extraction and ion chromatograph. Results show that the particulate emission from the test engine operated with heavy fuel oil is three times as much as the value with diesel oil and that not only sulfate but SOF and dry soot concentration increase with the increase in fuel sulfur content. It is also found that the conversion rate from sulfur in fuel into sulfate in particulate matter is nearly independent of the sulfur content in the fuel and increases with the increase in the engine load.

The Applied Research of Emulsified Heavy Fuel Oil Used for the Marine Diesel Engine

2013 ◽  
Vol 779-780 ◽  
pp. 469-476 ◽  
Author(s):  
Yong Chao Miao ◽  
Chun Ling Yu ◽  
Bing Hui Wang ◽  
Kai Chen
Keyword(s):  
Diesel Engine ◽  
Cooling Water ◽  
Fuel Oil ◽  
Experimental Result ◽  
Outlet Temperature ◽  
Oil Consumption ◽  
Heavy Fuel Oil ◽  
Marine Fuel ◽  
Exhaust Temperature ◽  
Emulsified Fuel

In order to achieve the application of emulsified fuel oil on the marine,our discussion group developed a set of heavy fuel oil intelligent online emulsifying equipment tested on G6300ZC18B diesel of the ship Ningda "6". And the experimental result shows that, when water mixing ratio ranged from 16% to 24%, emulsification reached good level to apply as marine fuel. When burning emulsified fuel oil, the explosive pressure of diesel engine fluctuated in the range of 1-2Mpa, the exhaust temperature decreased 12°Cand the outlet temperature of cooling water declined slightly, but all the parameters above are in the normal range. The oil consumption decreased by 9.7% and the emission of NOX ,carbon smoke ,and CO reduced by 19.6%,20%,35% respectively.

scholarly journals Method for assessing the technical condition of marine diesel engine driving the synchronous generator

2019 ◽  
Vol 177 (2) ◽  
pp. 139-144
Author(s):  
Tomasz KNIAZIEWICZ ◽  
Marcin ZACHAREWICZ
Keyword(s):  
Diesel Engine ◽  
Rotational Speed ◽  
Synchronous Generator ◽  
Technical Condition ◽  
Marine Diesel Engine ◽  
Phase Voltage ◽  
Working Process ◽  
Working Cycle ◽  
Marine Diesel ◽  
Speed Fluctuation

The paper presents an innovative method for assessing technical condition of a marine diesel engine that drives synchronous generator. It is based on the measurement and analysis of generators phase-to-phase voltage. Additionally, it requires the measurement of a pseudoperiodic signal [3] with a period equal to duration of engines working cycle. The basis for developing method was the assumption that rotational speed fluctuations of an engines crankshaft (and also the generator) depend on a course of a working process carried out in it. The generators phase-to-phase voltage is directly dependent on a rotational speed fluctuation of its rotor. It must therefore be possible to assess a course of a working process of an engine based on a voltage waveform of a synchronous generator that cooperates ogether.

Effect of the use of a thermoelectric generator on the pumping work of a diesel engine

2019 ◽  
pp. 146808741986804
Author(s):  
Samir Ezzitouni ◽  
Pablo Fernández-Yáñez ◽  
Luis Sánchez ◽  
Octavio Armas ◽  
Felipe Soto
Keyword(s):  
Diesel Engine ◽  
Energy Recovery ◽  
Internal Combustion Engines ◽  
Thermoelectric Generator ◽  
Electrical Power ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Light Duty ◽  
The Cross

Approximately a third part of the energy intake of a light-duty diesel engine is wasted through the exhaust system. Rising awareness of environmental issues together with fuel economy has encouraged research upon energy recovery in internal combustion engines. This article focuses on the application of thermoelectric generators in light-duty diesel vehicles. Most studies available in the literature tend to focus on maximizing the recovered electrical power, not always considering the increase in engine pumping work or testing conditions similar to those of a vehicle. The goal of this article is to evaluate the consequences of the modification of the cross-sectional area in the exhaust pipe that adding a thermoelectric generator implies and to compare them with the electrical power produced by the thermoelectric generator. The effect on the indicated and pumping parameters of the engine under common urban driving conditions is presented. From the results, it can be drawn that within the limits of engine speed and torque tested, the modification of the cross-sectional area does not have a significant negative effect on the engine pumping efficiency. This means that there is potential for the employment of this technique in energy recovery from light-duty vehicles.

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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