3D-CFD Lagrangian Spray Simulations for Large Two Stroke Marine Diesel Engines Compared With Experimental Data of a Spray Combustion Chamber

2012 ◽  
Author(s):  
M. Bolla ◽  
M. A. Cattin ◽  
Y. M. Wright ◽  
K. Boulouchos ◽  
R. Schulz
Keyword(s):  
Experimental Data ◽  
Combustion Chamber ◽  
Numerical Data ◽  
Swirl Flow ◽  
Fuel Oil ◽  
Spray Combustion ◽  
Fuel Quality ◽  
Heavy Fuel Oil ◽  
Marine Engines ◽  
Simulation Results

The behavior of lagrangian spray models for the application in large two stroke marine engines is investigated. 3D-CFD simulations of a Spray Combustion Chamber (SCC) with a single hole (0.875 mm diameter) injector are presented and compared with experimental results. Shadow images of the spray under evaporating and non-evaporating conditions, with and without swirl flow and for different chamber pressures are available by means of which the simulation results are validated. A novel post processing methodology for 3D CFD spray simulations is introduced, which converts the numerical data into images which allows for a more rigorous quantitative comparison with the experimental data. Good agreement of the simulation results with the experiment is reported both in terms of spray penetration as well as concerning the evaporation of the fuel. Since the appropriate discretization of the large volumes typical of 2-stroke marine engines presents a substantial challenge, the influence of the grid resolution is investigated. In addition, the influence of fuel quality on the evolution of the spray morphology is assessed. For this purpose, simulations with heavy fuel oil (HFO) are compared with experiment.

THE APPLICATION OF FUZZY AHP – VIKOR HYBRID METHOD TO INVESTIGATE THE STRATEGY FOR REDUCING AIR POLLUTION FROM DIESEL POWERED VESSELS

2021 ◽  
Vol 162 (A3) ◽  
Author(s):  
H Demirel ◽  
M Mollaoğlu ◽  
U Bucak ◽  
T Arslan ◽  
A Balin
Keyword(s):  
Air Pollution ◽  
Human Health ◽  
Hybrid Method ◽  
Fossil Fuels ◽  
Fuzzy Ahp ◽  
Maritime Transportation ◽  
Fuel Oil ◽  
Fuel Quality ◽  
Heavy Fuel Oil ◽  
Marine Areas

The negative impact of air pollution on human health had become a vital issue as a result of the increasing use of fossil fuels in recent years. In this context, maritime transportation is one of the most contaminant sectors by using much more fossil fuels. Ships which have a major role in maritime transport, directly affect human health via its emissions, especially in marine areas close to the land such as around the ports, canals, and straits. In this study, strategies were gathered by evaluating International Maritime Organization (IMO) regulations, European Union (EU) recommendations and the applications of the ship owner companies to reduce air pollution stem from ships, and considering the priority perception of these strategies, the effect level of the strategies at the marine areas where ships are approaching the land was analysed by the Fuzzy Analytic Hierarchy Process-Visekriterijumska Optimizacija I Kompromisno Resenje (AHP- VIKOR) hybrid method. As a result of the study, the most effective strategies appeared as “Forbiddance of Heavy Fuel Oil (HFO) usage on Ships” and “Detection of Low Sulphur Fuel Usage by the help of Remote Detector Systems”, and it was seen that these strategies would be most effective in canal or strait passing of the ships. It was also revealed that the relevant expert opinions and IMO regulations meshed together, and it was pointed out the applications for increasing fuel quality.

Autoignition of Heavy Fuel Oil Sprays at High Pressures and Temperatures

1990 ◽  
Vol 112 (3) ◽  
pp. 324-330 ◽  
Author(s):  
R. S. G. Baert
Keyword(s):  
Combustion Chamber ◽  
Ignition Delay ◽  
High Pressures ◽  
Fuel Injection ◽  
Fuel Oil ◽  
Single Shot ◽  
Heavy Fuel Oil ◽  
Fuel Oils ◽  
Constant Volume Combustion Chamber ◽  
Heavy Fuel Oils

This paper reports on an experimental study of the autoignition behavior of several heavy fuel oils in a large constant-volume combustion chamber with single-shot injection. In the experiments the pressure and the temperature of the air in the combustion chamber before fuel injection varied between 30 and 70 bar and between 730 and 920 K. Illumination delay and pressure delay values have been correlated with these pressures and temperatures. It is shown that for all but one of the fuels examined, ignition delay ranking changes little with the choice of ignition delay definition, but more with the pressure and temperature conditions in the combustion chamber. The usefulness of the Calculated Carbon Aromaticity Index is discussed.

scholarly journals The Combustion of Emulsified Glycerol-Heavy Oil Fuel Droplet

2018 ◽  
Vol 5 ◽  
Author(s):  
S. Soulayman ◽  
K. Youssef
Keyword(s):  
Combustion Chamber ◽  
Crude Glycerol ◽  
Applied Pressure ◽  
Empirical Method ◽  
Fuel Oil ◽  
Biodiesel Production ◽  
Heavy Fuel Oil ◽  
Fuel Droplets ◽  
Temperature Combustion ◽  
Oil Fuel

In this work the evaporation of the emulsified glycerol- heavy fuel oil (CG-HFO) droplets with different activator is modeled. The influence of activator gas bubbles volume developments on the evaporation of fuel droplets in the high temperature combustion chamber is studied. The crude glycerol as the secondary product of biodiesel production is used as the first component of the emulsion while the second component is heavy fuel oil. The crude glycerol contains methanol, aromatics, minerals, a little bit biodiesel and water. These materials were pressurized and injected in the chamber with three inputs: the first one is for the CG-HFO, the second one is for activator while the third one is for air for forming the emulsion and then passing to the combustion chamber. The applied pressure is determined according to contents which lead to flame stability of the primary formed emulation. A comparison of calculated results, basing on semi-empirical method, with experimental ones demonstrates the modeling acceptable accuracy.

Use of Chromium Containing Fuel Additive to Reduce High Temperature Corrosion of Hot Section Parts

2000 ◽  
Author(s):  
Jean-Pierre Stalder ◽  
Peter A. Huber
Keyword(s):  
High Temperature ◽  
Hot Corrosion ◽  
Gas Turbines ◽  
High Temperature Corrosion ◽  
Fuel Oil ◽  
Fuel Additive ◽  
Fuel Quality ◽  
Common Belief ◽  
Heavy Fuel Oil ◽  
Fuel Treatment

The use of “clean” fuel is a prerequisite at today’s elevated gas turbine firing temperature, modern engines are more sensitive to high temperature corrosion if there are impurities present in the fuel and/or in the combustion air. It is a common belief that distillate grade fuels are contaminant-free, which is often not true. Frequently operators burning distillates ignore the fuel quality as a possible source of difficulties. This matter being also of concern in plants mainly operated on natural gas and where distillate fuel oil is the back-up fuel. Distillates may contain water, dirt and often trace metals such as sodium, vanadium and lead which can cause severe damages to the gas turbines. Sodium being very often introduced through contamination with seawater during the fuel storage and delivery chain to the plant, and in combination, or with air borne salt ingested by the combustion air. Excursions of sodium in treated crude or heavy fuel oil can occur during unnoticed malfunctions of the fuel treatment plant, when changing the heavy fuel provenience without centrifuge adjustment, or by inadequate fuel handling. For burning heavy fuel, treatment with oil-soluble magnesium fuel additive is state of the art to inhibit hot corrosion caused by vanadium. Air borne salts, sodium, potassium and lead contaminated distillates, gaseous fuels, washed and unwashed crude and residual oil can not be handled by simple magnesium based additives. The addition of elements like silicon and/or chromium is highly effective in reducing turbine blade hot corrosion and hot section fouling. This paper describes field experience with the use of chromium containing fuel additive to reduce high temperature corrosion of hot section parts, as well as the interaction of oil-soluble chromium and magnesium-chromium additives on material behaviour of blades and vanes, and their economical and environmental aspects.

The Application of Fuzzy AHP - VIKOR Hybrid Method to Investigate the Strategy for Reducing Air Pollution from Diesel Powered Vessels

2020 ◽  
Vol 162 (A3) ◽  
Author(s):  
H Demirel ◽  
M Mollaoglu ◽  
U Bucak ◽  
T Arslan ◽  
A Balin
Keyword(s):  
Air Pollution ◽  
Human Health ◽  
Hybrid Method ◽  
Fossil Fuels ◽  
Fuzzy Ahp ◽  
Maritime Transportation ◽  
Fuel Oil ◽  
Fuel Quality ◽  
Heavy Fuel Oil ◽  
Marine Areas

The negative impact of air pollution on human health had become a vital issue as a result of the increasing use of fossil fuels in recent years. In this context, maritime transportation is one of the most contaminant sectors by using much more fossil fuels. Ships which have a major role in maritime transport, directly affect human health via its emissions, especially in marine areas close to the land such as around the ports, canals, and straits. In this study, strategies were gathered by evaluating International Maritime Organization (IMO) regulations, European Union (EU) recommendations and the applications of the ship owner companies to reduce air pollution stem from ships, and considering the priority perception of these strategies, the effect level of the strategies at the marine areas where ships are approaching the land was analysed by the Fuzzy Analytic Hierarchy Process-Visekriterijumska Optimizacija I Kompromisno Resenje (AHP-VIKOR) hybrid method. As a result of the study, the most effective strategies appeared as “Forbiddance of Heavy Fuel Oil (HFO) usage on Ships” and “Detection of Low Sulphur Fuel Usage by the help of Remote Detector Systems”, and it was seen that these strategies would be most effective in canal or strait passing of the ships. It was also revealed that the relevant expert opinions and IMO regulations meshed together, and it was pointed out the applications for increasing fuel quality.

Mineral-Metal, Multiphase Coatings to Protect Combustion Chamber Components Against Hot-Gas Corrosion and Thermal Loading

2011 ◽  
Vol 133 (10) ◽  
Author(s):  
Vadim Verlotski ◽  
Rudolf H. Stanglmaier ◽  
Günter Moormann ◽  
Ralph Geraets
Keyword(s):  
Combustion Chamber ◽  
Thermal Loading ◽  
Ceramic Coatings ◽  
Fuel Oil ◽  
Heavy Fuel Oil ◽  
Hot Gas ◽  
Effective Manner ◽  
Gas Corrosion ◽  
Exhaust Valves ◽  
Highly Loaded

Many marine and stationary engines operate on fuels that contain corrosive elements, with the result that some highly loaded combustion chamber components must be replaced frequently. Märkisches Werk, GmbH (MWH) has pioneered the development of mineral-metal, multiphase coatings to protect valves and other highly loaded engine components against hot-gas corrosion. Mineral-metal, multiphase coatings are a unique and innovative approach to improving hot-gas corrosion resistance in a cost-effective manner. In general, these coatings combine the beneficial chemical and thermal attributes of ceramic coatings with the mechanical properties and substrate adhesion characteristics of a metal. Extensive laboratory and field trials have proven that MWH CrystalCoat protects heavy fuel oil (HFO) engine exhaust valves against hot-gas corrosion. It is projected that the newest coating formulation (CrystalCoat HT) will protect four-stroke HFO exhaust valves against hot-gas corrosion over their entire service life.

Sign in / Sign up

Export Citation Format

Share Document