A5018896986- Coal Combustion and Slurry Processing
- Combustion and flame dynamics
- Thermochemical Biomass Conversion Processes
- Combustion and Detonation Processes
- Lignin and Wood Chemistry
- Electromagnetic Launch and Propulsion Technology
- Industrial Technology and Control Systems
- Phase Equilibria and Thermodynamics
- Mining and Gasification Technologies
- Environmental and Industrial Safety
- Mineral Processing and Grinding
- Rocket and propulsion systems research
- Electric Power Systems and Control
- Radiative Heat Transfer Studies
- Chemical and Physical Properties of Materials
- Particle accelerators and beam dynamics
- Biodiesel Production and Applications
- Algal biology and biofuel production
- Nanofluid Flow and Heat Transfer
- Subcritical and Supercritical Water Processes
- Aerospace Engineering and Control Systems
- Thermal Analysis in Power Transmission
- Differential Equations and Numerical Methods
- Advanced Control Systems Design
- Biofuel production and bioconversion
University of Latvia
2016-2024
Abstract Experimental studies and mathematical modelling of the effects magnetic field on combustion dynamics at thermo-chemical conversion biomass are carried out with aim providing control processes developing in reaction zone swirling flame. The joint research effect includes estimation this formation flame dynamics, temperature composition, analysis characteristics. results experiments have shown that exerts influence flow velocity components by enhancing a swirl motion swirl-enhanced...
This paper deals with a simplified model taking into account the interplay of compressible, laminar, axisymmetric flow and electrodynamical effects due to Lorentz force’s action on combustion process in cylindrical pipe. The Arrhenius kinetics is modelled by single step exothermic chemical reaction fuel oxidant. We analyze non-stationary PDEs 6 unknown functions: 3 components velocity, density, concentration temperature. For pressure ideal gas law used. inviscid approximation ADI method Some...
The goal of this study is to provide a more effective use wheat straw for energy production by co-firing it with gaseous fossil fuel – propane. includes experimental work and mathematical modelling the processes developing at influence additional heat supply on thermal decomposition straw, formation, ignition combustion volatiles, output from device flue gas composition. Experimental results give evidence that propane enhances pellets providing so faster complete burnout volatiles. By...
The focus of this study is to investigate the main factors determining development swirling flow dynamics and correlate non-premixed flame characteristics at biomass thermo-chemical conversion with evolution confined velocity fields in a pilot device which combines gasifier combustor.This includes complex experimental numerical modelling for non-reacting flows flame, as well combustion thermochemical under effects various inlet conditions, such nozzle diameter bottom combustor, primary air...
The characteristics of a flame are influenced by external magnetic field and the swirl number. present paper considers simplified model taking into account interplay flow MHD effects due to Lorentz force acting on weakly ionised gas. We results numerical study viscous, incompressible, laminar, axisymmetric swirling flow in cylindrical pipe with axial uniform field. combustion process is modelled single step exothermic chemical reaction fuel oxidant. rate given one-step first-order Arrhenius...
In this paper 2D stationary boundary value problem for the system of magnetohydrodynamic (MHD) equations along with heat transfer equation is considered.The viscous electrically conducting incompressible liquid-electrolyte to move between infinite cylinders placed periodically.Similarly MHD channel flow periodically obstacles on walls examined.We analyze convection around and subject homogeneous external magnetics field.The cylinders, constant temperature are heated.The goal such...
The recent research was focused on experimental study and mathematical modelling of the gradient magnetic field effect development swirling flame dynamics to better understand mechanism interaction between flames non-uniform provide control main gasification/combustion characteristics at thermo-chemical conversion biomass (wood) pellets.The influence flow composition products carried out, using an device, which is composed a gasifier water-cooled sections combustor, downstream develops.The...
The recent research is focused on the experimental study and mathematical modelling of development combustion dynamics at thermo-chemical conversion biomass mixtures (straw with wood pellets) aim to better understand effect straw co-combustion pellets formation main gasification/ characteristics.The results have shown that thermal interaction between components average mass load in mixture up 20-30 % promotes faster decomposition accelerates flaming volatiles.The model considers two second...
The recent research is focused on experimental study and mathematical modelling of the development combustion dynamics at thermo-chemical conversion biomass mixtures (straw pellets with crashed coal) aim to better understand effect electric field formation main gasification/ characteristics when co-combusting straw coal.The numerical effects dynamics, coal, were carried out ensure wider use as a fuel for energy production providing electrodynamic process control.The model considers influence...
In this research, we extend our studies of the extraction process from diverse plant materials, introducing advancements to previous models. Our framework considers dynamic elements by taking into account motion particles, departing statical particle assumption in prior articles. Several methods such as moving geometries or modified equations for a system with particles Lagrangian coordinates are introduced boost precision simulations, complex dynamics solvent and its interaction material....
The main aim of the research is to provide wider and more efficient use a renewable fuel -straw for energy production with reduced GHG carbon polluting NO x emissions during co-firing straw pellets gas (propane) und using electric field control thermochemical conversion straw.A pilot plant combined biomass gasifier combustion chamber heat power up 4 kW has been used gas, which supplied at outlet average input 0.8 kW.A positively charged electrode was inserted axially into flame base...
A series of experimental studies and mathematical simulations the electric field influence on thermal decomposition mixtures wheat straw with wood peat pellets development volatile combustion downstream swirling flame flow was carried out.The main aim these is to provide more efficient use for cleaner energy production by improving gasification/combustion characteristics mixture composition emission.The dynamics studied experimentally using a pilot device, which combines biomass gasifier...
The main goal of the present study is to promote a more effective use agriculture residues (straw) as an alternative renewable fuel for cleaner energy production with reduced greenhouse gas emissions. With aim improve combustion characteristics at thermo-chemical conversion wheat straw, complex experimental and mathematical modelling processes developing when co-firing straw pellets gaseous were carried out. effect on gasification was studied experimentally by varying propane supply additional...
The authors consider the process of extraction from heterogeneous plant material; a novel model offering 3D spatial resolution is proposed and simulation possibilities by applying several modern numerical methods for three dimensional problems are discussed. These types naturally arise when one wishes to mathematically describe processes with solvents such as supercritical carbon dioxide (scCO2). results this meet demand functional foods, nutraceutical, pharmaceutical cosmetic industries on...
The mathematical modelling of straw co-firing with propane is performed account variations combustible volatiles by increasing the supply gas into experimental device.In accordance data average values molar density H 2 and CO at inlet combustor depending on electric field in model are usedas mass fraction concentration thetwo second-order exothermic chemical reactions.The developed using MATLAB for solving a system parabolic type partial differential equations to describe formation 2D...
In this study, effects of straw co-firing with a renewable fuel – low heating value biogas on the combustion characteristics, heat output from device and composition flue gas, are studied analyzed aim to achieve more efficient use for energy production. The study combines experimental research mathematical modelling processes developing at pellets biogas, which consists 60 % methane 40 % CO2. complex gasification characteristics suggests that increase supply 0 up 1.35 l/min (additional input...
The author considers the reacting flow problem modelling and simulation possibilities by using Matlab software its packages.These types of problems naturally arise when one wishes to mathematically describe processes combustion or gasification different fuels including biomass.These topics have been widely researched institutes in Latvia during last years.The packages are considered as a very powerful tool it comes matrix operations.Such operations involved discretizing systems partial...