scholarly journals Spraying of Composite Liquid Fuels Based on Types of Coal Preparation Waste: Current Problems and Achievements: Review

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7282
Author(s):  
Roman Volkov ◽  
Timur Valiullin ◽  
Olga Vysokomornaya
Keyword(s):  
Component Composition ◽  
Liquid Fuels ◽  
Jet Formation ◽  
Fuel Atomization ◽  
Large Gradient ◽  
Droplet Sizes ◽  
Mass Flow Rates ◽  
Atomization Characteristics ◽  
Favorable Conditions ◽  
Fuel Suspension

This article discusses the atomization of composite liquid fuels. A large group of injectors is considered. A comparative analysis of the atomization characteristics (droplet sizes and velocities, jet opening angles) and the influence of the fuel characteristics (density, viscosity, component composition) and the process parameters (the ratio of the fuel–air mass flow rates, the features of the jet formation) has been carried out. Finally, the most effective types of injectors, which provide for the necessary characteristics of fuel atomization for its combustion, have been determined. The most favorable conditions for the applicability of each type of atomization have been formulated. Possible mechanisms of secondary fragmentation of droplets of composite fuels have been analyzed: those resulting from mutual collisions of droplets in the flux and from the interaction with a solid surface as well as those resulting from thermal overheating in the presence of a phase boundary or a large gradient of component volatility. A conclusion is made about the need of using a synergistic effect of primary and secondary atomization of fuel suspension droplets.

Determınatıon of Atomızatıon Characterıstıcs of a Dıesel Injector

2015 ◽  
Vol 799-800 ◽  
pp. 826-830
Author(s):  
Gökhan Tuccar ◽  
Göktürk Memduh Özkan ◽  
Kadir Aydın
Keyword(s):  
Combustion Chamber ◽  
Cavitation Erosion ◽  
High Pressures ◽  
Liquid Fuels ◽  
Injection System ◽  
Engine Emissions ◽  
Complete Combustion ◽  
Fuel Atomization ◽  
Atomization Characteristics

Atomization of liquid fuels is very important topic for combustion studies since it enhances air/ fuel mixing process and therefore ensures perfect combustion. With today’s common diesel injectors, fuel is directly injected into the combustion chamber with extremely high pressures which exceed 1300 bar in order to obtain perfect atomization. However, these high injection pressures unfortunately create some problems in the injection system such as cavitation erosion which may lead to mechanical failure. Introducing of air into the injector prior to combustion will increase fuel atomization, provide more complete combustion, enhance fuel economy and results in lower engine emissions. The aim of this study is to investigate atomization behaviour of a newly introduced diesel engine which mixes air and fuel prior to combustion chamber.

Production and Analytical Comparison of Atomization Characteristics for Ternary Blends of Biodiesel

2017 ◽  
Vol 8 (4) ◽  
Author(s):  
K. Sudalaiyandi ◽  
K.S. Amirthagadeswaran ◽  
P. Selvan
Keyword(s):  
Diesel Fuel ◽  
Edible Oils ◽  
Exhaust Emission ◽  
Ternary Blends ◽  
Rubber Seed Oil ◽  
Binary Blends ◽  
Rubber Seed ◽  
Biodiesel Blends ◽  
Fuel Atomization ◽  
Atomization Characteristics

By the plenty usage of diesel fuel in automobiles, it is necessary to switch over to the alternate fuel such as biodiesel. Generally non edible oils are blended with diesel after the esterification process. But here ternary biodiesel blends with diesel fuel produce almost equal drop size when compared with some binary blends with large quantities of diesel. The ternary biodiesel blends give less amount exhaust emission than the binary blends with diesel. In this work, biodiesel is produced from linseed and rubber seed oil by trans-esterification process and then the fuel atomization characteristics have been determined, The sauter mean diameter of atomization is also computed by analytically. The ternary blends having 90% diesel and 5% linseed biodiesel, 5% rubber seed biodiesel and also 80% diesel, 10% linseed biodiesel and 10% rubber seed biodiesel are observed to give comparatively similar atomization characteristics of diesel.

scholarly journals Numerical study of the parameters of a gas turbine combustion chamber with steam injection operating on distillate fuel

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Serhiy Serbin ◽  
Kateryna Burunsuz
Keyword(s):  
Combustion Chamber ◽  
Gas Turbine ◽  
Mass Flow ◽  
Liquid Fuel ◽  
Numerical Study ◽  
Steam Injection ◽  
Liquid Fuels ◽  
Combustion Chambers ◽  
Mass Flow Rates ◽  
Gas Turbine Combustion

AbstractInvestigations of the working process in a gas turbine combustion chamber with ecological and energy steam injection operating on liquid fuel are conducted. The mathematical model of the aerodynamic processes and liquid fuel combustion in similar burning devices based on the numerical solution of the system of conservation and transport equations for a multi-component chemically reactive turbulent system is developed. The influence of the relative steam mass flow rate (the ratio of the sum of the mass flow rates of ecological and energy steam to the fuel consumption) on the combustion chamber’s emission characteristics is determined. The obtained results can be used for parameter selection and optimization of promising high-temperature gas turbine combustion chambers with steam injection operating on liquid fuels.

A Study of the Spray Characterization from a Centrifugal Nozzle by Pulsed Laser Holography

2012 ◽  
Vol 152-154 ◽  
pp. 846-851 ◽  
Author(s):  
Na Cao ◽  
Liang Cao ◽  
Chang Cai Han ◽  
Qing Xu ◽  
Lan Lei ◽  
...  
Keyword(s):  
Cone Angle ◽  
Engine Performance ◽  
Measuring System ◽  
Spray Cone Angle ◽  
Simulation Code ◽  
Spray Cone ◽  
Fuel Atomization ◽  
Droplet Sizes ◽  
Laser Holography ◽  
Spatial Locations

Centrifugal nozzle is an important part of an areoengine in which fuel atomization has strong influence on engine performance. For investigating the fuel spray characteristics, a promising method named off-axis particle holographic measuring system is used here. Characteristics of the nonevaporating spray ejected from a new type of centrifugal nozzle which would be used in the near future are obtained under various injection conditions. By automatic analysis of the holographic reconstructed droplets images, a hollow-cone shape spray with most droplets concentrated in the surface of the cone is observed, and the spray cone angle, droplet sizes and their spatial locations in concerned region are obtained quantitativly. In the near region of the nozzle exit, droplets show greater SMD value, while at a certain distance from the nozzle, the droplets SMD differences become unconspicuous which shows a better atomization. These informations are helpful to understand characteristics of the centrifugal nozzle and offer a database for validating the spray simulation code.

Research on the effect of cavitation on fuel atomization characteristics by molecular dynamics simulation

2019 ◽  
Vol 33 (22) ◽  
pp. 1950259
Author(s):  
Chao Qiu ◽  
Siqi An ◽  
Yongfeng Shang ◽  
Shuxian Chen
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Point Of View ◽  
Dynamics Simulation ◽  
Combustion Stability ◽  
Fuel Droplets ◽  
Advantages And Disadvantages ◽  
Fuel Atomization ◽  
Cavitation Intensity ◽  
Atomization Characteristics

The atomization characteristic of fuel is an important factor that affects the combustion stability of aero-gas turbine engine, and is of great significance to the safe operation of aircraft. By means of molecular dynamics simulation, the advantages and disadvantages of cavitation on fuel atomization process are analyzed from the point of view of molecular mechanics and molecular motion, and the influence of cavitation intensity on fuel atomization characteristics is revealed. The results show that when the cavitation intensity ranges from 0% and 5%, the cavitation is helpful to improve the atomization characteristics of fuel. Especially when the cavitation intensity is up to 3%, the dispersion of fuel droplets is the best. However, with the increase of the cavitation intensity, the pressure and energy of fuel decrease sharply, and the breakup, spray penetration and dispersion of fuel become worse, which leads to the deterioration of fuel atomization characteristics.

Electrical control of the combustion of solid and liquid particulate suspensions

1971 ◽  
Vol 324 (1557) ◽  
pp. 201-215 ◽  
Keyword(s):  
Electric Fields ◽  
Theoretical Calculations ◽  
Liquid Fuels ◽  
Experimental Conditions ◽  
Particulate Suspensions ◽  
Flow Parameters ◽  
Fuel Atomization ◽  
Multi Stage ◽  
The Individual ◽  
Microscope Slides

The individual steps in using electric fields for dispersing solid and liquid fuels, for controlling the trajectories of the resulting charged particles and for manipulating their burning, are studied in turn—both experimentally and theoretically. After establishing the feasibility of the basic principles using powdered solids and distilled water, the remaining work is carried out using paraffin, with an antistatic additive, as fuel. The experimental conditions under which sprays are monodisperse are established, using a magnifying schlieren system and MgO-coated microscope slides, and accounted for theoretically. This makes possible the prediction of droplet size and charge in terms of the applied electrical, geometrical and flow parameters and permits the deduction of mobility. The measurement of droplet velocities in control fields, using both photographic particle tracking and the interference of Dopplershifted laser light scattered by the droplets, confirms these theoretical calculations. Similar methods are then applied to burning droplets but difficulties are encountered due to leakage of charge occasioned by chem i-ionization in the flames. These difficulties are overcome by separating the flames electrically from the preceding stages of electrical air induction, fuel atomization, mixing and vaporization. This leads to the development of burners operated entirely by fields which draw in and accelerate air from the surroundings using corona discharges in multi-stage ion pumps, the last stage of which atomizes and disperses the fuel. The theory of such devices indicates how optimum conditions of operation can be achieved in practice.

Sign in / Sign up

Export Citation Format

Share Document