Simulation of Dual-Fuel Diesel Combustion With Multi-Zone Fuel Spray Combustion Model

2014 ◽  
Author(s):  
Andrey Kuleshov ◽  
Khamid Mahkamov ◽  
Andrey Kozlov ◽  
Yury Fadeev
Keyword(s):  
Combustion Chamber ◽  
Alternative Fuels ◽  
Thermodynamic Simulation ◽  
Injection Pressure ◽  
Diesel Oil ◽  
Spray Angle ◽  
Combustion Model ◽  
Dual Fuel ◽  
Fuel System ◽  
Fuel Sprays

There is increasing interest in application of various alternative fuels in marine diesel engines, including methanol. One of the challenges in the relevant research is the development of computer codes for simulation of the dual-fuel working process and engineering optimization of engines. In this work the mathematical model is described which simulates a mixture formation and combustion in an engine with a dual-fuel system, in which methanol is used as main fuel and a pilot portion of diesel oil is injected to ignite methanol. The developed combustion model was incorporated into the existing engine full cycle thermodynamic simulation tool, namely DIESEL-RK [1]. The developed combustion model includes the self-ignition delay calculation sub-model based on the detail chemistry simulation of methanol pre-combustion reactions, sub-model of evaporation of methanol droplets, submodels of methanol fuel sprays penetration, spray angle and droplets forming, respectively. The developed computer code allows engineers to account for the arbitrary shape of the combustion chamber. Additionally, each fuel system (for methanol and diesel oil) may include several injectors with arbitrary oriented nozzles with different diameters and central, off-central and side location in the combustion chamber. The fuel sprays evolution model consists of equations with dimensionless parameters to account for fuel properties and in-cylinder conditions. Specifics of injection pressure profiles and interaction of sprays with the air swirl and between themselves are also considered. The model allows engineers to carry out rapid parametric analysis. Results of modelling for a medium speed dual-fuel diesel engine are presented which demonstrate a good agreement between calculated and experimental heat release curves and integral engine data.

scholarly journals EFFECT OF CNG IN A FUEL DOSE ON THE COMBUSTION PROCESS OF A COMPRESSION-IGNITION ENGINE

Transport ◽  
2015 ◽  
Vol 30 (2) ◽  
pp. 162-171 ◽  
Author(s):  
Maciej Mikulski ◽  
Sławomir Wierzbicki
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Alternative Fuels ◽  
Combustion Process ◽  
Diesel Oil ◽  
Dual Fuel ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Compression Ignition Engines ◽  
Main Component

Currently, one of the major trends in the research of contemporary combustion engines involves the potential use of alternative fuels. Considerable attention has been devoted to methane, which is the main component of Natural Gas (NG) and can also be obtained by purification of biogas. In compression-ignition engines fired with methane or Compressed Natural Gas (CNG), it is necessary to apply a dual-fuel feeding system. This paper presents the effect of the proportion of CNG in a fuel dose on the process of combustion. The recorded time series of pressure in a combustion chamber was used to determine the repeatability of the combustion process and the change of fuel compression-ignition delay in the combustion chamber. It has been showed that NG does not burn completely in a dual-fuel engine. The best conditions for combustion are ensured with higher concentrations of gaseous fuel. NG ignition does not take place simultaneously with diesel oil ignition. Moreover, if a divided dose of diesel is injected, NG ignition probably takes place at two points, as diesel oil.

Phenomenological Modeling of Combustion in Pre-Chamber and the Pilot Flame for Natural Gas Engines

2019 ◽  
Author(s):  
Long Liu ◽  
Xia Wen ◽  
Qian Xiong ◽  
Xiuzhen Ma
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Alternative Fuels ◽  
Gas Flow ◽  
Combustion Process ◽  
Clean Energy ◽  
Combustion Model ◽  
Flame Surface ◽  
Flow Process ◽  
Natural Gas Engines

Abstract With energy shortages and increasing environmental problems, natural gas, as a clean energy, has the advantages of cheap price and large reserves and has become one of the main alternative fuels for marine diesel engines. For large bore natural gas engines, pre-chamber spark plug ignition can be used to increase engine efficiency. The engine mainly relies on the flame ejected from the pre-chamber to ignite the mixture of natural gas and air in the main combustion chamber. The ignition flame in the main combustion chamber is the main factor affecting the combustion process. Although the pre-chamber natural gas engines have been extensively studied, the characteristics of combustion in the pre-chamber and the development of ignition flame in the main combustion chamber have not been fully understood. In this study, a two-zone phenomenological combustion model of pre-chamber spark-ignition natural gas engines is established based on the exchange of mass and energy of the gas flow process in the pre-chamber and the main combustion chamber. The basic characteristics of the developed model are: a spherical flame surface is used to describe the combustion state in the pre-chamber, and according to the turbulent jet theory, the influence of turbulence on the state of the pilot flame is considered based on the Reynolds number. According to the phenomenological model, the time when the flame starts to be injected from the pre-chamber to the main combustion chamber, and the parameters such as the length of the pilot flame are analyzed. The model was verified by experimental data, and the results showed that the calculated values were in good agreement with the experimental values. It provides an effective tool for mastering the law of flame development and supporting the optimization of combustion efficiency.

The Development Problems of Two-Fuel Burner for the Gas Turbine Combustion Chamber

2021 ◽  
Author(s):  
A. Yu Vasilyev ◽  
O. G. Chelebyan ◽  
A. I. Maiorova ◽  
A. N. Tarasenko ◽  
D. S. Tarasov ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Liquid Fuel ◽  
Fuel Injection ◽  
Reverse Flow ◽  
Experimental Studies ◽  
Injection Pressure ◽  
Spray Angle ◽  
Preliminary Experimental Data ◽  
Fuel Injection Pressure ◽  
Air Channels

Abstract The work is devoted to the design of a spraying device for the combustion chamber GTE-65.1 on liquid fuel. The paper presents the following results: 1) The 3D calculations of the air channels characteristics for two burners types — pilot and main — were carried out. Data were obtained on the flow and pressure fields inside and at the burners outlet, and also the volumes of the reverse flow zones. 2) The main and pilot nozzles have been designed for the two spraying devices types. The values of droplet dispersity and spray angle were obtained, depending on the fuel injection pressure. 3) Based on the calculations carried out, the models of two spraying liquid fuel devices were designed and manufactured, the design of which is based on the design of the single-fuel combustion chamber (CC) on natural gas burners for GTE-65.1. At the next stage of the work, it is planned to carry out experimental studies of the two devices models aimed at obtaining an aerosol mixture with the desired properties to ensure uninterrupted operation of the GTE-65.1 on liquid fuel. Some preliminary experimental data are presented in this paper.

Improved CFD Predictions of Pyrolysis Oil Combustion Using Advanced Spray Measurements and Numerical Models

2021 ◽  
Author(s):  
Eva van Beurden ◽  
Artur Pozarlik ◽  
Bima Putra ◽  
Gerrit Brem ◽  
Thijs Bouten ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Gas Turbine ◽  
Alternative Fuels ◽  
Numerical Models ◽  
Cone Angle ◽  
Fast Pyrolysis ◽  
Combustion Model ◽  
Pyrolysis Oil ◽  
Cfd Simulations ◽  
Gas Turbine Combustion

Abstract In search of an economical and environmentally friendly manner of power generation the industry is forced to find fuels which can replace conventional fossil fuels. During the last years this has led to significant developments in the production of alternative fuels, whereby these fuels became a more reliable and more efficient source of energy. Fast pyrolysis oil (FPO) is considered as a promising example of one of the alternative fuels. This research focuses on the application of FPO in a gas turbine combustion chamber. For the OPRA OP16 gas turbine, a numerical approach using advanced CFD simulations has been applied to a real scale gas turbine combustor. The simulations are supported by full-scale combustor tests and atomizer spray experiments. Hereby it has been shown numerically and experimentally that the gas turbine combustion chamber can operate on FPO in the 30–100% load range. The droplet Sauter Mean Diameter (SMD) has been investigated by means of a Particle Droplet Image Analysis to visualize the sprays in the near field of the atomizer. The effects of the spray pattern are of key importance to the flame structure in the gas turbine combustion chamber. Therefore the results from this dedicated test experiment have been used as input for dedicated CFD simulations. A dedicated combustion model of fast pyrolysis oil has been developed for the OpenFOAM code, considering both the evaporation of the oil and the burnout of the char. In the simulations the gas turbine electrical load, the cone angle and the droplet SMD of the spray were varied. These simulations provide a detailed insight and description on the evaporation of the pyrolysis oil and the flame characteristics in the low calorific fuel combustor of OPRA’s OP16.

Spray Characteristics of Diesel and Biodiesel in Direct Injection Diesel Engine

2013 ◽  
Vol 768 ◽  
pp. 173-179
Author(s):  
P. Raghu ◽  
K. Thilagan ◽  
M. Thirumoorthy ◽  
Siddharth Lokachari ◽  
N. Nallusamy
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Distribution System ◽  
Alternative Fuels ◽  
Direct Injection ◽  
Video Camera ◽  
Image Processing Technique ◽  
Spray Angle ◽  
High Definition ◽  
Spray Characteristics

Alternative fuels for diesel engines are becoming important due to the decrease of petroleum reservoirs and the increase of environment pollution problems. The biodiesel is technically competitive with conventional petroleum-derived diesel fuel and requires no changes in the fuel distribution system. Injection process of biodiesel influences the atomization and dispersion of fuel in the combustion chamber. In diesel Engine different tests have been performed to improve the efficiency in cycle, power, less emission, speed, etc. There are various methods of visualizing the combustion chamber in a Diesel engine. For visualizing spray characteristics of combustion chamber in Diesel engine the window of 10mm diameter hole, transparent quartz glass materials are used, which can with-stand 1500°C temperature and pressure of about 1000 bar and engine is hand cranked for conducting the experiments. Spray characteristics of palm oil methyl ester (POME) and diesel were studied experimentally. Spray penetration and spray angle were measured in a combustion chamber of DI diesel engine by employing high definition video camera and image processing technique. The study shows the POME gives longer spray tip penetration and spray angle are smaller than those of diesel fuels. This is due to the viscosity and density of biodiesel.

scholarly journals Selection of an algorithms controlling operation of supercharged compression ignition engine with additional fueling with CNG gas

2017 ◽  
Vol 170 (3) ◽  
pp. 42-48
Author(s):  
Zdzisław STELMASIAK ◽  
Jerzy LARISCH ◽  
Dariusz PIETRAS
Keyword(s):  
Diesel Oil ◽  
Gaseous Fuel ◽  
Dual Fuel ◽  
Compression Ignition ◽  
Fuel System ◽  
Compression Ignition Engine ◽  
Fuel Supply ◽  
Oil Supply ◽  
Control Procedures ◽  
Selection Of

The article presents an issues concerning selection of controlling algorithms for operation of supercharged compression ignition engine fueled additionally with CNG gas, including implemented control procedures, adjustment algorithms and operational algorithms. As the result, the engine which is run in dual fuel system operates under control of two controllers, factory ECU controller, governing fueling with the base fuel (Diesel oil) and all fueling parameters, and the second controller for gaseous fuel supply. Priority of operation of the controllers relates to fueling with Diesel oil, while the gas is treated as supplementary fuel. Due to possibility of usage of factory made original ECU controller as used with Diesel oil supply; it has been presented proposal of its software in form of array algorithms.

scholarly journals Assessment of technical and environmental performance of Marine Alternative fuels for Container Ships

2021 ◽  
Author(s):  
Ahmed G. Elkafas ◽  
Mohamed R. Shouman
Keyword(s):  
Alternative Fuels ◽  
Combustion Process ◽  
Efficiency Index ◽  
Diesel Oil ◽  
Air Pollutant ◽  
Pollutant Emissions ◽  
Dual Fuel ◽  
Shipping Industry ◽  
Marine Diesel ◽  
Dual Fuel Engines

Abstract Environmental issues, for example, the expanded air pollutant emissions from ships are progressively affecting the operation of ships. Therefore, International Maritime Organization (IMO) has adopted many goals to decarbonizing the shipping industry by at least 40% by 2030. Marine fuels play a major role in these goals because of the emissions resulting from the combustion process. Therefore, the present research proposes to convert the conventional engine operated by marine diesel oil (MDO) to a dual-fuel engine operated by either natural gas (NG) or methanol. As a case study, A15-class container ship is investigated. The results showed that the dual-fuel engine operated with (98.5% NG and 1.5% MDO) will reduce CO2, SOx, and NOx emissions by 28%, 98% and 85%, respectively when compared with their values for conventional diesel engine. On the other hand, the reduction percentages reach to 7%, 95% and 80% when using a dual-fuel engine operated with (95% Methanol and 5% MDO), respectively. The proposed dual-fuel engines operated by either NG and methanol will improve the ship energy efficiency index by 26% and 7%, respectively.

scholarly journals EFFECTS OF INJECTION TIMING OF DIESEL FUEL ON PERFORMANCE AND EMISSION OF DUAL FUEL DIESEL ENGINE POWERED BY DIESEL/E85 FUELS

Transport ◽  
2018 ◽  
Vol 33 (3) ◽  
pp. 633-646 ◽  
Author(s):  
Wojciech Tutak ◽  
Arkadiusz Jamrozik ◽  
Ákos Bereczky ◽  
Kristof Lukacs
Keyword(s):  
Combustion Chamber ◽  
Cross Sections ◽  
Diesel Fuel ◽  
Combustion Engine ◽  
Combustion Process ◽  
Diesel Oil ◽  
Dual Fuel ◽  
Injection Timing ◽  
Main Stage ◽  
Performance And Emission

The paper presents the results of the investigation of Dual Fuel (DF) diesel engines powered by high bioethanol contain fuel – E85. The object of the investigation is a three-cylinder Compression Ignition (CI) Internal Combustion Engine (ICE) powered by diesel oil and bioethanol fuel E85 injected into the intake port as a DF engine. With the increase in the share of E85 fuel the highest intensification of the combustion process takes place in the main stage of the combustion and the ignition delay increases as well. The researchers are conducted using Computational Fluid Dynamics (CFD) method; the results of the investigation are successfully verified based on the indicator diagrams, heat performance rate and emissions. Based on CFD results the cross sections investigation of the combustion chamber it can be seen that in case of the DF engine, the flame front propagates with a higher speed. The initial phase of the combustion starts in a different location of the combustion chamber than in the classic CI engine. Replacement of diesel fuel by E85 in 20% resulted in the shortening of the combustion duration more than 2-times. With the increase of energetic share in E85 the soot emission is decreased at all ranges of the analysed operations of the engine. The oppositerelationship was observed in case of NO emission. With the increase of E85 in the fuel, the emission of NO increased.

scholarly journals Study of the diesel engine working process during its operation with a fuel injection pressure of 300 MPa

2020 ◽  
Vol 1 (6) ◽  
pp. 13-27
Author(s):  
Nguyen Thin Quynh ◽  
◽  
A.Y. Dunin ◽  
Keyword(s):  
Combustion Chamber ◽  
Fuel Injection ◽  
Combustion Process ◽  
Injection Pressure ◽  
Spray Angle ◽  
Boost Pressure ◽  
Working Process ◽  
Fuel Injection Pressure ◽  
Tip Velocity ◽  
The Impact

The paper presents the simulation result of the influence of the ratio of the diameter Dкс of the combustion chamber to its depth hкс and boost pressure рк on the characteristics of a 1ChN 12/13 single-cylinder engine with an injection pressure of 300 MPa at a crankshaft speed of 1400 min-1. The simulation was performed with Dкс/hкс from 3.4 to 10.0, and рк from 0.15 to 0.45 MPa. The re-sults show that the engine achieves the best performance when nitrogen oxides NOx in the exhaust gases decreases at Dкс/hкс= (7.8 ÷ 10), and the pressure рк from 0.25 to 0.35 MPa. At рк= 0.35 MPa, Dкс/hкс= 10, the indicated power increases by 7.1%. NOx reduces by 68% but soot, CO and CH in-crease by 4.5, 9.5, and 2.2 times, respectively. The results also show the impact of the boost pressure рк on spray characteristics. The boost pressure рк increases, the penetration, and the tip velocity decrease, but the spray angle changes a little. While the combustion chamber diameter changes, the penetration, and the spray angle change a little, and the tip velocity varies much. The boost pressure рк is a means of redistributing the amount of fuel burned in the jet and near the wall of the combus-tion chamber. With an increase in the boost pressure, the proportion of fuel that burns at the begin-ning of the combustion process under conditions of volumetric mixing increases, while at the end of the combustion process, a large concentration of fuel is located near the combustion chamber wall.

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