scholarly journals Numerical modeling of the combustion of pre-mixed fuel in micromodule burner

2020 ◽  
Vol 2 (1) ◽  
pp. 1-7
Author(s):  
D.R. Umyshev ◽  
A.M. Dostiyarov ◽  
S.B. Sadykova ◽  
I. Iliev ◽  
A.M. Dostiyarova
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Nitrogen Oxides ◽  
Environmental Performance ◽  
Combustion Zone ◽  
Mixed Fuel ◽  
Burner Model

The article presents the results of numerical simulation for the combustion of pre-mixed fuel in micromodule. The study prerequisites, burner model and the initial modeling conditions are presented. It is shown that the burner has high environmental performance outside the stoichiometry zone. The dependences of temperatures on the coefficient of excess fuel are presented, which confirm the dependence of the concentration of nitrogen oxides on the excess fuel.The concluding section presents a formula for calculating the concentration of nitrogen oxides based on the temperature in the combustion zone.

scholarly journals Estimating Ecological Properties of Rapeseed Oils for Using as Agricultural Tractor Motor Fuel

2020 ◽  
Vol 30 (1) ◽  
pp. 43-59
Author(s):  
Sergey А. Plotnikov ◽  
Pavel Ya. Kantor ◽  
Ilya S. Kozlov ◽  
Marina N. Vtyurina
Keyword(s):  
Diesel Engine ◽  
Nitrogen Oxides ◽  
Performance Indicators ◽  
Environmental Performance ◽  
Rapeseed Oil ◽  
Component Structure ◽  
Mixed Fuel ◽  
Agricultural Tractor ◽  
Tractor Diesel ◽  
Environmental Performance Indicators

Introduction. The relevance of the study is determined by the need to estimate the influence of mixed fuel, including diesel and biofuel (rapeseed oil), on ecological parameters of an agricultural tractor diesel in working in agricultural fields and transporting. The objective of the study is forecasting, obtaining and comparing the calculated and experimental environmental performance indicators of the Belarus-922 tractor diesel engine using mixed fuel for farming operations. Materials and Methods. To achieve the objective of the study, the quantitative indicators of component structure of rapeseed oil samples of various origins have been defined, a theoretical estimation and the comparison of calculated and experimental environmental performance indicators of tractor diesel engine have been made with the use of the necessary equipment. Results. For the first time, quantitative values of indexes of the component composition of rapeseed oils of various origins have been obtained. The analysis has shown that the most recommended to be used as fuel is the sample with the maximum content of unsaturated acids that will allow providing the maximum speed and combustion efficiency. The calculations show a decrease in working temperature by 200 K as a result of added rapeseed oils that should lead to a reduction of the constant of the reaction speed and concentration of nitrogen oxides approximately by a factor of 2.7. The endogenous origin of nitrogen compounds influences essentially on the concentration of nitrogen oxides in worked-out gases. Discussion and Conclusions. Based on the analysis of nitrogen oxide mechanisms on combustion of rapeseed oils, the calculation of the semi-quantitative reaction rate is theoretically proved and experimentally confirmed.

WET BURNING – THE MODERN TREND IN ENVIRONMENTAL BENIGN FUEL COMBUSTION AND IN SOLUTION TO THE PROBLEM OF SUSTAINABLE DEVELOPMENT OF THE POWER GENERATION

2018 ◽  
pp. 96-117 ◽  
Author(s):  
B. S. Soroka
Keyword(s):  
Numerical Simulation ◽  
Nitrogen Oxides ◽  
Chemical Kinetics ◽  
Fuel Combustion ◽  
Transport Processes ◽  
Cfd Modeling ◽  
Furnace Chamber ◽  
Modern Trend ◽  
Atmospheric Air ◽  
No Formation

The article considers the role and place of water and water vapor in combustion processes with the purpose of reduction the effluents of nitrogen oxides and carbon oxide. We have carried out the complex of theoretical and computational researches on reduction of harmful nitrogen and carbon oxides by gas fuel combustion in dependence on humidity of atmospheric air by two approaches: CFD modeling with attraction of DRM 19 chemical kinetics mechanism of combustion for 19 components along with Bowman’s mechanism used as “postprocessor” to determine the [NO] concentration; different thermodynamic models of predicting the nitrogen oxides NO formation. The numerical simulation of the transport processes for momentum, mass and heat being solved simultaneously in the united equations’ system with the chemical kinetics equations in frame of GRI methane combustion mechanism and NO formation calculated afterwards as “postprocessor” allow calculating the absolute actual [CO] and [NO] concentrations in dependence on combustion operative conditions and on design of furnace facilities. Prediction in frame of thermodynamic equilibrium state for combustion products ensures only evaluation of the relative value of [NO] concentration by wet combustion the gas with humid air regarding that in case of dry air – oxidant. We have developed the methodology and have revealed the results of numerical simulation of impact of the relative humidity of atmospheric air on harmful gases formation. Range of relative air humidity under calculations of atmospheric air under impact on [NO] and [CO] concentrations at the furnace chamber exit makes φ = 0 – 100%. The results of CFD modeling have been verified both by author’s experimental data and due comparing with the trends stated in world literature. We have carried out the complex of the experimental investigations regarding atmospheric air humidification impact on flame structure and environmental characteristics at natural gas combustion with premixed flame formation in open air. The article also proposes the methodology for evaluation of the nitrogen oxides formation in dependence on moisture content of burning mixture. The results of measurements have been used for verification the calculation data. Coincidence of relative change the NO (NOx) yield due humidification the combustion air revealed by means of CFD prediction has confirmed the qualitative and the quantitative correspondence of physical and chemical kinetics mechanisms and the CFD modeling procedures with the processes to be studied. A sharp, more than an order of reduction in NO emissions and simultaneously approximately a two-fold decrease in the CO concentration during combustion of the methane-air mixture under conditions of humidification of the combustion air to a saturation state at a temperature of 325 K.

NUMERICAL SIMULATION OF THE LIGHT AIRCRAFT PROPELLER NOISE UNDER STATIC CONDITION

Akustika ◽  
2021 ◽  
pp. 100-106
Author(s):  
sergey Timushev ◽  
Alexey Yakovlev ◽  
Petr Moshkov
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Modeling ◽  
Vortex Method ◽  
Static Condition ◽  
Semiempirical Model ◽  
Calculation Methods ◽  
Propeller Noise ◽  
Calculation Results ◽  
Static Conditions

The problem of simulation the noise generated during the operation of the propeller is considered. Calculation methods are described and numerical simulation of the noise of a light aircraft propeller by the acoustic-vortex method is performed. The results of numerical modeling of the tonal components of the propeller noise when operating under static conditions are compared with experimental data and calculation results based on a semiempirical model.

A Semi-Discrete Approach for the Numerical Simulation of Freestanding Blocks

2016 ◽  
pp. 416-439
Author(s):  
Fernando Peña
Keyword(s):  
Differential Equation ◽  
Numerical Simulation ◽  
Numerical Modeling ◽  
Discrete Model ◽  
Mathematical Formulation ◽  
Equation Of Motion ◽  
Rigid Bodies ◽  
The Body ◽  
Discrete Approach ◽  
Rocking Motion

This chapter addresses the numerical modeling of freestanding rigid blocks by means of a semi-discrete approach. The pure rocking motion of single rigid bodies can be easily studied with the differential equation of motion, which can be solved by numerical integration or by linearization. However, when we deal with sliding and jumping motion of rigid bodies, the mathematical formulation becomes quite complex. In order to overcome this complexity, a Semi-Discrete Model (SMD) is proposed for the study of rocking motion of rigid bodies, in which the rigid body is considered as a mass element supported by springs and dashpots, in the spirit of deformable contacts between rigid blocks. The SMD can detect separation and sliding of the body; however, initial base contacts do not change, keeping a relative continuity between the body and its base. Extensive numerical simulations have been carried out in order to validate the proposed approach.

scholarly journals Solution of Acoustic Tomographic Problems on the Basis of Numerical Simulation of Particle Dynamics

2018 ◽  
Vol 155 ◽  
pp. 01019
Author(s):  
Angela Kuzovova ◽  
Ivan Kuzmenko
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Wave Propagation ◽  
Continuous Media ◽  
Particle Dynamics ◽  
Direct Wave ◽  
Backward Wave ◽  
Propagation Of Waves ◽  
Backward Propagation

A method is proposed for imaging of scattering heterogeneities in continuous media on the basis of numerical modeling of forward and backward wave propagation. It is shown that the combination of a solution for backward propagation of waves and direct wave propagation allows us to visualize scattering heterogeneities. The results of numerical simulation are presented.

Numerical Modeling of Oil Spill with Tidal and Wind-Driven Coupled Model in Bohai Bay

2013 ◽  
Vol 423-426 ◽  
pp. 1394-1397
Author(s):  
Ming Chang Li ◽  
Guang Yu Zhang ◽  
Qi Si ◽  
Shu Xiu Liang ◽  
Zhao Chen Sun
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Oil Spill ◽  
Hydrodynamic Model ◽  
Field Data ◽  
Coupled Model ◽  
Bohai Bay ◽  
Trajectory Simulation ◽  
Simulation Results

Based on the hydrodynamic model and wind field data, a multi-module coupled oil spill model is constructed for simulating the trajectory of oil movement. A case study is researched in Bohai Bay. The model works well and the numerical simulation results show the model is suitable for oil spill trajectory simulation. Two cases are considered with and without wind to show its important influence for the oil spill.

The Numerical Simulation Analysis of Tuyere's Temperature Field and Stress Field

2013 ◽  
Vol 706-708 ◽  
pp. 1701-1704 ◽  
Author(s):  
Xi Ping Guo ◽  
Wen Yue Han
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Temperature Field ◽  
Stress Field ◽  
Simulation Analysis

Research on the temperature field and stress field of tuyere by numerical modeling and analyse the influence of structure on tuyere's property.

Numerical Simulation of Free-Surface Turbulence

1994 ◽  
Vol 47 (6S) ◽  
pp. S163-S165
Author(s):  
Douglas G. Dommermuth ◽  
Rebecca C. Y. Mui
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Free Surface ◽  
Numerical Simulations ◽  
Free Surface Flows ◽  
Direct Numerical Simulations ◽  
Large Eddy Simulations ◽  
Surface Flows ◽  
Large Eddy ◽  
Free Surface Turbulence

Direct numerical simulations and large-eddy simulations of turbulent free-surface flows are currently being performed to investigate the roughening of the surface, and the scattering, radiation, and dissipation of waves by turbulence. The numerical simulation of turbulent free-surface flows is briefly reviewed. The numerical, modeling, and hardware issues are discussed.

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