scholarly journals CFD SIMULATION OF TEMPERATURE REGIMES OF THE COMBUSTION ZONE OF STABILIZER-TYPE BURNERS WITH ASYMMETRIC FUEL SUPPLY

2019 ◽  
Vol 41 (4) ◽  
pp. 13-18
Author(s):  
N.М. Fialko ◽  
V.G. Prokopov ◽  
Ju.V. Sherenkovskyi ◽  
S.O. Alioshko ◽  
N.O. Meranova ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Combustion Zone ◽  
Cfd Simulation ◽  
Temperature Fields ◽  
Fuel Gas ◽  
Fuel Distribution ◽  
Temperature Regimes ◽  
Stage Combustion ◽  
Heat State ◽  
Stabilizer Type

The results of computer simulation of the heat state of the combustion zone and the burnup rate of fuel for stabilizer burners with asymmetric fuel distribution are presented. The features of temperature fields in this zone that are characteristic of the conditions under study are revealed. The analysis of these features in the aspect of their conditionality by the two-stage combustion of fuel gas is carried out.

scholarly journals CFD SIMULATION OF TEMPERATURE REGIMES OF THE COMBUSTION ZONE OF STABILIZER-TYPE BURNERS WITH ASYMMETRIC FUEL SUPPLY

2020 ◽  
Vol 42 (1) ◽  
pp. 19-26
Author(s):  
N.М. Fialko ◽  
V.G. Prokopov ◽  
Ju.V. Sherenkovskyi ◽  
S.O. Alioshko ◽  
N.O. Meranova ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Combustion Zone ◽  
Cfd Simulation ◽  
Temperature Fields ◽  
Fuel Gas ◽  
Fuel Distribution ◽  
Temperature Regimes ◽  
Stage Combustion ◽  
Heat State ◽  
Stabilizer Type

The results of computer simulation of the heat state of the combustion zone and the burnup rate of fuel for stabilizer burners with asymmetric fuel distribution are presented. The features of temperature fields in this zone that are characteristic of the conditions under study are revealed. The analysis of these features in the aspect of their conditionality by the two-stage combustion of fuel gas is carried out.

INFLUENCE OF THE FIRE-TECHNICAL FACILITY LOAD ON THE HEAT STATE OF MICROJET BURNER DEVICES WITH MULTILAYER COATINGS

2017 ◽  
Author(s):  
Nataliia Fialko ◽  
◽  
Viktor Prokopov ◽  
Julii Sherenkovskiy ◽  
Nataliia Meranova ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
Multilayer Coatings ◽  
Technical Facility ◽  
Temperature Regimes ◽  
Wide Range ◽  
Heat State

The results of CFD simulation of temperature regimes of microjet burners with protective multilayer coatings are presented, when the load of fire-technical facilities equipped with these burners varies over a wide range.

The Effect of Regulating Elements on Convective Heat Transfer along Shaped Heat Exchange Surfaces

2013 ◽  
Vol 34 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Jozef Cernecky ◽  
Jan Koniar ◽  
Zuzana Brodnianska
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Cfd Simulation ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Heat Transfer Intensification ◽  
Heat Transfer Coefficients ◽  
Forced Air

Abstract The paper deals with a study of the effect of regulating elements on local values of heat transfer coefficients along shaped heat exchange surfaces with forced air convection. The use of combined methods of heat transfer intensification, i.e. a combination of regulating elements with appropriately shaped heat exchange areas seems to be highly effective. The study focused on the analysis of local values of heat transfer coefficients in indicated cuts, in distances expressed as a ratio x/s for 0; 0.33; 0.66 and 1. As can be seen from our findings, in given conditions the regulating elements can increase the values of local heat transfer coefficients along shaped heat exchange surfaces. An optical method of holographic interferometry was used for the experimental research into temperature fields in the vicinity of heat exchange surfaces. The obtained values correspond very well with those of local heat transfer coefficients αx, recorded in a CFD simulation.

Conditional Moment Closure LES Modelling of an Aero-Engine Combustor at Relight Conditions

2011 ◽  
Author(s):  
Simon R. Stow ◽  
Marco Zedda ◽  
Antonios Triantafyllidis ◽  
Andrew Garmory ◽  
Epaminondas Mastorakos ◽  
...  
Keyword(s):  
Low Temperature ◽  
Flame Front ◽  
High Speed ◽  
Cfd Simulation ◽  
Moment Closure ◽  
Reactive Flow ◽  
Conditional Moment ◽  
Fuel Distribution ◽  
Conditional Moment Closure ◽  
Aero Engine

A Conditional Moment Closure (CMC) approach embedded in an LES CFD framework is presented for simulation of the reactive flow field of an aero-engine combustor operating at altitude relight conditions. Before application to the combustor geometry, the CMC model was validated on the standard lab-scale Sandia flame D. For the combustor simulation, a global mechanism for n-heptane was used along with a Lagrangian approach for the spray, to which a secondary break-up model was applied. The simulation modelled a multi-sector sub-atmospheric rig that was used to verify the altitude relight capability of the combustor. A comprehensive suite of diagnostics was applied to the rig test, including high-speed OH and kerosene PLIF as well as high speed OH* chemiluminescence. The CMC-based CFD simulation was able to predict well the position of the flame front and fuel distribution at the low pressure, low temperature conditions typical of altitude relight. Furthermore, the simulation of the ignition showed strong similarities with OH* chemiluminescence measurements of the event. An EBU-based LES was run too and showed to be unable to capture the flame front as well as the CMC model could. This work demonstrates that CMC LES can be an effective tool to support assessment of the relight capability of aero-engine combustors.

Theoretical Estimation of Thermal Deformations of Non-Lubricated Bearings of Low-Flow Turbocharger Units

2019 ◽  
pp. 58-69
Author(s):  
N.A. Raykovskiy ◽  
V.L. Yusha ◽  
A.V. Tretyakov ◽  
V.A. Zakharov
Keyword(s):  
Turbine Unit ◽  
Mutual Influence ◽  
Cooling System ◽  
Temperature Fields ◽  
Low Flow ◽  
Lubrication System ◽  
Calculation Methods ◽  
Operating Modes ◽  
Temperature Regimes ◽  
Temperature Deformations

When designing turbocharger units (microturbines) working with high-temperature flows, it is possible to completely abandon lubrication system and use self-lubricating bearings instead. At the same time, it is important to ensure the required temperature regimes and permissible temperature deformations. Currently, there are no calculation methods that could be used to determine the temperature fields and temperature deformations of the ‘rotor — self-lubrication bearings’ system. The paper proposes a numerical method for calculating bearing assemblies, which takes into account the mutual influence of the operating modes of the turbine unit and the bearing cooling system. The proposed method is tested, and the results of the analysis of temperatures and temperature deformations are presented.

Heat Transfer Process Computer Simulation and Microstructure Prediction During Crystallization of Metal Alloys

2013 ◽  
Vol 43 (1) ◽  
pp. 71-78
Author(s):  
Georgi Evt. Georgiev ◽  
Sasho Popov ◽  
Valentin Manolov ◽  
Rositsa Dimitrova ◽  
Pavel Kuzmanov
Keyword(s):  
Heat Transfer ◽  
Computer Simulation ◽  
Cast Iron ◽  
Aluminum Alloys ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Metal Alloys ◽  
Temperature Fields ◽  
Microstructure Prediction ◽  
Process Computer

Abstract Processes of crystallization during casting formation from aluminum alloys, steel and cast iron have been studied using 3-D com- puter simulation. Temperature fields of castings have been obtained and the microstructure distribution of these castings has been predicted. A comparison between numerical results and experimental measurement has been performed. It is proved, that the proposed approach is suitable for investigation and analysis of casting technologies.

scholarly journals Hőkezelési folyamat számítógépes modellezése

2009 ◽  
Vol 4 (1) ◽  
pp. 117-123
Author(s):  
Zoltán Fabulya ◽  
György Hampel
Keyword(s):  
Heat Treatment ◽  
Computer Simulation ◽  
Energy Consumption ◽  
Specific Energy Consumption ◽  
Time Span ◽  
Fuel Gas ◽  
Environment Management ◽  
Treatment Processes ◽  
Long Time ◽  
Canned Meat

The heat treatment of cans, particularly canned meat, is a process with a big energy need, since the cans need sterilization, a heat treatment with a long time span around 120°C with the use of fuel gas in big quantity. The reduction of the use of the natural resources is the challenge in our days which appears in the new system approach of the environment management, the principle of sustainable development. That is to say, let us produce the same amount of products with less energy consumption, or more amounts with less specific energy consumption. The heat treatment is used to avert microbiological danger. The operation regulation has to be defined in a way which produces a microbiologically reliable product, but does not harm its organoleptic peculiarities, substance, taste and flavour because of the oversized treatment. In the interest of safety we have to define the extent and the time span of the heat effect leading to the destruction of the microbiological pathogens with the use of engineering calculations, modelling and computer simulation. We also have to secure the observance of the regulations obtained this way for the sake of the higher quality and the less resource utilization. This observance ability is answered with the help of our developed model for the computer simulation of heat treatment processes.

Effect of wear-resistant coatings on heat state of twist drills

2020 ◽  
pp. 440-443
Author(s):  
V.P. Tabakov ◽  
M.F.J. Al-Kadhimiya ◽  
D.I. Sagitov
Keyword(s):  
Heat Generation ◽  
Thermal State ◽  
Multilayer Coating ◽  
Temperature Fields ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Drilling Operation ◽  
Heat State ◽  
Twist Drills

The effect of wear-resistant coatings on the thermal state of twist drills is studied. The effect of wear-resistant coatings on the distribution of temperature fields in the cutting wedge and the distribution of heat generation intensity along the main, minor cutting edges and transverse edge of the drill is shown. The requirements for coatings for the drilling operation of workpieces are formulated and the architecture of the multilayer coating is formed.

Optimization of Temperature Regimes of the Hotend for Devices of Additive Manufacturing

2021 ◽  
Vol 1037 ◽  
pp. 41-46
Author(s):  
Andrey Y. Sinev ◽  
Roman A. Panasenko ◽  
Valeria V. Petrenko ◽  
Aleksandr Vasilievich Berestov ◽  
Yuri V. Bozhko
Keyword(s):  
Theoretical Calculations ◽  
Temperature Fields ◽  
3D Printer ◽  
Ansys Software ◽  
Typical Problem ◽  
Heating Device ◽  
Materials Modeling ◽  
Temperature Regimes ◽  
3D Printers ◽  
Scale Experiment

In this work, the authors tried to solve a typical problem of inexpensive 3D printers using FDM technology: material clogging of the hotend. To cope with the problem, it is necessary to solve the problem of optimization the temperature regimes of the hotend. For this, the temperature fields of the heating device were simulated taking into account the physical properties of the printing materials. Modeling was carried out using the ANSYS software package, the verification of theoretical calculations was carried out in a full-scale experiment. The data obtained was used to upgrade the 3D printer hotend.

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