scholarly journals MODELATION OF THE RADIATION CHARACTERISTICS OF THE GAS PHASE COMBUSTION PRODUCTS BASED ON HIGH THEMPERATURE ATLASES OF SPECTRAL LINE PARAMETERS

2019 ◽  
Vol 20 (11-12) ◽  
pp. 65-80
Author(s):  
N. I. Moskalenko ◽  
I. R. Dodov ◽  
G. V. Kayumova ◽  
A. R. Khaertdinova ◽  
M. S. Khamidullina ◽  
...  
Keyword(s):  
Gas Phase ◽  
Radiation Heat Transfer ◽  
Experimental Studies ◽  
Direct Calculation ◽  
Combustion Products ◽  
Spectral Lines ◽  
Radiation Heat ◽  
Absorption Bands ◽  
Radiation Characteristics ◽  
Multicomponent Media

High temperature atlass of spectral lines parameters of the combustion production of energy fuels and their use for modeling the radiation characteristics of the optically active ingredients and radiation heat transfer in high structurally inhomogeneous multicomponent media are considering. The model of the absorption bands to determine the functions of spectral transmission and parameterization according to the results of numerical modelation performed by direct calculation of the fine structure of the emission (absorption) spectra, followed by their numerical integration. The results of the calculations are compared with the data of experimental studies.

scholarly journals Numerical modeling of radiation heat exchange in combustion chambers and heat exchangers of power installations

2020 ◽  
Vol 209 ◽  
pp. 03018
Author(s):  
Nikolay Moskalenko ◽  
Ibragim Dodov ◽  
Azat Akhmetshin
Keyword(s):  
Numerical Modeling ◽  
Heat Exchange ◽  
Radiation Heat Transfer ◽  
Combustion Products ◽  
Spectral Lines ◽  
Spectral Transmission ◽  
Radiation Heat ◽  
Combustion Chambers ◽  
Two Phase ◽  
Radiation Heat Exchange

The application of numerical modeling is considered to solve the problems of radiation heat exchange in structurally inhomogeneous two-phase media which are realized during the combustion of fuel in boiler units atmospheric emissions from air carriers when they move at supersonic speeds. The optically active ingredients of the gas phase of the combustion products have a sharp selection of spectral absorption lines (radiation) which causes a difference in the spectral transmission functions for selective radiation from the spectral transmission functions for non-selective radiation (gray body). In the presence of a dispersed phase of the combustion products acute selection is subjected to such a parameter of the radiation propagation medium as the probability of quantum survival. The number of spectral lines determining the spectral transmission functions increases with temperature and is determined by hundreds of thousands of lines at high temperatures. In this paper we consider a closed simulation of radiation heat transfer in combustion chambers when the temperature field in the combustion chambers is calculated first and then the flux of thermal radiation to the tube heat-receiving surfaces.

scholarly journals Experimental studies on radiation heat transfer enhancement on a standard muffle furnace

2013 ◽  
Vol 17 (2) ◽  
pp. 591-598
Author(s):  
Alina Minea ◽  
Oronzio Manca
Keyword(s):  
Heat Transfer ◽  
Radiation Heat Transfer ◽  
Experimental Studies ◽  
Experimental Investigations ◽  
Heating Process ◽  
Radiation Heat ◽  
Industrial Energy ◽  
Time Savings ◽  
Important Time ◽  
Industrial Energy Consumption

One of the sources of increased industrial energy consumption is the heating equipment, e.g., furnaces. Their domain of use is very wide and due to its abundance of applications it is key equipment in modern civilization. The present experimental investigations are related to reducing energy consumptions and started from the geometry of a classic manufactured furnace. During this experimental study, different cases have been carefully chosen in order to compare and measure the effects of applying different enhancement methods of the radiation heat transfer processes. The main objective work was to evaluate the behavior of a heated enclosure, when different radiant panels were introduced. The experimental investigation showed that their efficiency was influenced by their position inside the heating area. In conclusion, changing the inner geometry by introducing radiant panels inside the heated chamber leads to important time savings in the heating process.

scholarly journals Fine structural spectrometry and spectroradiometry of combustion products of energy fuels

2019 ◽  
Vol 124 ◽  
pp. 05016 ◽  
Author(s):  
N.I. Moskalenko ◽  
Yu.A. Ilyin ◽  
O.V. Zotov ◽  
I.R. Dodov ◽  
A.R. Akhmetshin
Keyword(s):  
Radiative Heat ◽  
Experimental Studies ◽  
Emission Spectra ◽  
Combustion Products ◽  
Radiative Heat Exchange ◽  
Molecular Absorption ◽  
Combustion Chambers ◽  
Multicomponent Media ◽  
Gas Fuel ◽  
Selection Of

The results of experimental studies of the fine structure of the spectra of molecular absorption and emission of combustion products of energetic fuels and their application in solving problems of radiative heat transfer in structurally inhomogeneous multicomponent media are considered. The methods of determining the parameters of the spectral absorption lines from the experimental emission spectra of the flame in the combustion products of gas fuel the identification of optically active ingredients in the combustion products and anthropogenic emissions into the atmosphere are analyzed. Attention is drawn to the fact that the emission of gas components is selective and the methods for calculating the radiative heat exchange in the combustion chambers of power units must take into account the acute selection of the molecular absorption spectra of radiation.

Application of Hartmann Acoustic Generator in Source of Underwater Pyrotechnic Combustion

2013 ◽  
Vol 787 ◽  
pp. 638-643
Author(s):  
Jie Li ◽  
Hua Guan ◽  
Dong Ming Song ◽  
Qi Wang ◽  
Jun Du ◽  
...  
Keyword(s):  
Sound Pressure Level ◽  
Sound Pressure ◽  
Acoustic Radiation ◽  
Structural Parameters ◽  
Resonant Cavity ◽  
Experimental Studies ◽  
Combustion Products ◽  
Pressure Level ◽  
Radiation Characteristics ◽  
Acoustic Frequency

In order to investigate acoustic radiation characteristics of underwater pyrotechnic combustion, Hartmann acoustic generator was applied and its main structural parameters effecting acoustic radiation characteristics were studied by using underwater acoustic measurement system. Experimental studies have shown that, when Hartmann acoustic generator was applied, the sound pressure level of underwater pyrotechnic combustion increased significantly because of the strengthening of turbulence degree. The distance between the nozzle and the resonant cavity is an important factor of affecting acoustic radiation characteristics of Hartmann acoustic generator. When the resonant cavity was placed in the unstable pressure area, it could stimulate strong sound waves. On account of the resistance of the water, the combustion products speed of reaching resonant cavity drooped and the collision strength between the feedback combustion products and the newly generated products reduced. So when the distance was larger, the SPL(sound pressure level) was smaller. The SPL of underwater pyrotechnic combustion increased and the acoustic frequency moved to the low frequency with the depth of resonant cavity increased, which is consistent with the acoustic characteristics of Hartmann acoustic generator applied in air.

scholarly journals Objective Function for Numerical Mean Absorption Bands Optimization

2017 ◽  
Vol 4 (3) ◽  
pp. 269-272
Author(s):  
P. Kloc ◽  
V. Aubrecht ◽  
M. Bartlová
Keyword(s):  
Heat Transfer ◽  
Objective Function ◽  
Radiation Heat Transfer ◽  
Mean Value ◽  
Optimization Process ◽  
Radiation Heat ◽  
Temperature Dependent ◽  
Absorption Bands ◽  
Single Temperature ◽  
Selection Of

Mean absorption coefficients (MACs) offer great potential for fast numerical calculation of radiation heat transfer. They are based on replacing complex absorption coefficient spectrum by a handful of frequency bands with a single, temperature dependent value assigned to each band. Accuracy of radiation transfer calculation thus depends on the accurate interpretation of the mean value inside each frequency band as well as on the proper band distribution. Yet finding optimal band distribution is not an easy task often requiring numerical optimization process. This contribution focuses on the parameters of such optimization process, namely selection of an objective function and its effect on the optimal band distribution. It demonstrates, that improper objective functions can produce physically unreasonable artifacts in the calculation of radiation heat transfer. Optimal formulation of the objective function is proposed in this contribution.

Study on the Basic Characteristics of Low Oxygen Air Combustion with Natural Gas in Glass Tempering Furnace

2014 ◽  
Vol 672-674 ◽  
pp. 1510-1513
Author(s):  
Jia Qun Xia ◽  
Guang Hui Liu ◽  
Yu Si Wang ◽  
Hu Ping Li
Keyword(s):  
Heat Transfer ◽  
Natural Gas ◽  
Flue Gas ◽  
Radiation Heat Transfer ◽  
Combustion Products ◽  
Gas Composition ◽  
Low Oxygen ◽  
Radiation Heat ◽  
Excess Air ◽  
Basic Characteristics

The basic characteristics of natural gas with low oxygen air combustion is analyzed, and low oxygen content, excess air ratio, and the change of flue gas composition are studied, the results show that using the technology of low oxygen air combustion for glass tempering furnace in production has directive significance. The composition content of carbon dioxide and water vapor increases in the combustion products. The radiation heat transfer is decreased in glass tempering furnace. The furnace temperatures are maintained in the range of 650 to 800°C.

scholarly journals Application of high optical technologies to determine the temperature field, ingredient composition and microstructure of the dispersed phase of combustion products of energy fuels

2020 ◽  
Vol 216 ◽  
pp. 01031
Author(s):  
Nikolay Moskalenko ◽  
Azat Akhmetshin ◽  
Yana Safiullina
Keyword(s):  
Temperature Field ◽  
Power Plants ◽  
Radiation Heat Transfer ◽  
Combustion Products ◽  
Spectral Lines ◽  
High Spectral Resolution ◽  
Dispersed Phase ◽  
Combustion Chambers ◽  
Fixed Temperature ◽  
Ingredient Composition

Application of high optical technologies for determining the temperature field, ingredient composition and microstructure of the dispersed phase of combustion products of power fuels is considered. The temperature of the combustion products is determined by method of the self-reversal of spectral lines. To determine the ingredient composition, the methods of fine-structure spectroscopy are used, when the absorption spectra of flame radiation are measured with a high spectral resolution. Then the ingredients are identified by the position of the spectral lines, and their concentration – by the intensity of the spectral lines at a fixed temperature. The temperature field in the combustion chambers of power plants is reconstructed by the method of numerical simulation of radiation transfer in combustion products of an inhomogeneous radiation propagation medium. The obtained experimental data on optical characteristics are used to solve problems of radiation heat transfer in combustion chambers of power plants with multi-chamber furnaces. Prospects for the creation of high-temperature atlases of the parameters of spectral lines of the ingredients of the gas phase of combustion products and their application in promising developments of power plants and in rocket technology are considered.

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