Software for numerical simulation of multicomponent gas analysis of the atmosphere

2018 ◽  
Author(s):  
Oleg A. Romanovskii ◽  
Sergey A. Sadovnikov ◽  
Olga V. Kharchenko ◽  
Semyon V. Yakovlev
Keyword(s):  
Numerical Simulation ◽  
Gas Analysis ◽  
Multicomponent Gas

Software system for numerical simulation of broadband laser gas analysis of the atmosphere

2018 ◽  
pp. 66-73 ◽  
Author(s):  
S. A. Sadovnikov
Keyword(s):  
Numerical Simulation ◽  
Laser Radiation ◽  
Gas Analysis ◽  
Modular System ◽  
Software System ◽  
Transmission Spectra ◽  
Molecular Absorption ◽  
Molecular Scattering ◽  
Atmospheric Transmission ◽  
Wide Range

Introduction: Successful monitoring of environmental parameters requires the development of flexible software complexes with evolvable calculation functionality. Purpose: Developing a modular system for numerical simulation of atmospheric laser gas analysis. Results: Based on differential absorption method, a software system has been developed which provides the calculation of molecular absorption cross-sections, molecular absorption coefficients, atmospheric transmission spectra, and lidar signals. Absorption line contours are calculated using the Voigt profile. The prior information sources are HITRAN spectroscopic databases and statistical models of the distribution of temperature, pressure and gas components in the atmosphere. For modeling lidar signals, software blocks of calculating the molecular scattering coefficient and aerosol absorption/scattering coefficients were developed. For testing the applicability of various laser sources in the problems of environmental monitoring of the atmosphere, a concentration reconstruction error calculation block was developed for the atmospheric gas components, ignoring the interfering absorption of laser radiation by foreign gases. To verify the correct functioning of the software, a program block was developed for comparing the results of the modeling of atmospheric absorption and transmission spectra by using the standard SPECTRA information system. The discrepancy between the calculation of the atmospheric transmission spectra obtained using the developed system as compared to the SPECTRA results is less than 1%. Thus, a set of the presented program blocks allows you to carry out complex modeling of remote atmospheric gas analysis. Practical relevance: The software complex allows you to rapidly assess the possibilities of using a wide range of laser radiation sources for the problems of remote gas analysis.

scholarly journals A modification of the CABARET scheme for numerical simulation of multicomponent gaseous flows in two-dimensional domains

2015 ◽  
pp. 436-445
Author(s):  
А.В. Данилин ◽  
А.В. Соловьев ◽  
А.М. Зайцев
Keyword(s):  
Numerical Simulation ◽  
Initial Conditions ◽  
Experimental Studies ◽  
Two Dimensional ◽  
Governing Equations ◽  
Cabaret Scheme ◽  
Gaseous Flows ◽  
Multicomponent Gas ◽  
Good Agreement ◽  
Made In

Предложен явный численный алгоритм для расчета течений смесей идеальных газов в двумерных областях. Приведены физическая модель и уравнения движения смеси в консервативной и характеристической формах. Дискретизация уравнений движения произведена по методике Кабаре. Алгоритм испытан на задачах о прохождении ударной волны в воздухе через неоднородности из легкого и тяжелого газов, начальные условия для которых адаптированы из рассмотренных другими авторами натурных и численных экспериментов. Показано хорошее совпадение расчетов по предложенному алгоритму с результатами этих экспериментов. An explicit numerical algorithm for calculation of two-dimensional motion of multicomponent gas mixtures is proposed. A physical model as well as conservative and characteristic forms of governing equations are given. The discretization of the governing equations is made in accordance with the CABARET (Compact Accurately Boundary Adjusting-REsolution Technique) approach. The proposed algorithm is tested on problems of air shock waves passing through dense and dilute volume inhomogeneities with initial conditions adopted from numerical and experimental studies of other authors. A good agreement between the results of these studies and those obtained by the CABARET approach is shown.

Multicomponent gas analysis with first-overtone CO laser

2002 ◽  
Author(s):  
Andrei A. Ionin ◽  
Sergei Ivanov ◽  
Andrei A. Kotkov ◽  
A. Yu. Kozlov ◽  
Leonid V. Seleznev
Keyword(s):  
Gas Analysis ◽  
Co Laser ◽  
Multicomponent Gas

G0603 Numerical simulation of multicomponent gas flows in a mock containment vessel

2013 ◽  
Vol 2013 (0) ◽  
pp. _G0603-01_-_G0603-03_
Author(s):  
Masahiro ISHIGAKI ◽  
Satoshi ABE ◽  
Yasuteru SIBAMOTO ◽  
Taisuke YONOMOTO
Keyword(s):  
Numerical Simulation ◽  
Gas Flows ◽  
Containment Vessel ◽  
Multicomponent Gas

Cd-Diffused Lead Salt Diode Lasers And Their Application In Multicomponent Gas Analysis Systems

1983 ◽  
Author(s):  
H M. Preier ◽  
K H. Bachem ◽  
H Bottner ◽  
D Ball ◽  
W. J. Riedel ◽  
...  
Keyword(s):  
Diode Lasers ◽  
Gas Analysis ◽  
Lead Salt ◽  
Multicomponent Gas

scholarly journals Laser gas analysis for multicomponent gas mixtures with components without peaks in absorption spectra

2013 ◽  
Author(s):  
Л.Н. Еременко ◽  
◽  
М.Л. Белов ◽  
А.Ю. Бусаргин ◽  
В.А. Городничев ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Gas Mixtures ◽  
Gas Analysis ◽  
Multicomponent Gas

SIMULATION OF FILTRATION AND CONVECTIVE BURNING IN BLOCK CHARGES OF POWDER GRAINS INHIBITED BY POLYVINYL BUTYRAL AT CONSTANT VOLUME

2020 ◽  
Author(s):  
M. Yu. Nemtsev ◽  
◽  
I. V. Semenov ◽  
B. S. Ermolaev ◽  
V. E. Khrapovsky ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Polyvinyl Butyral ◽  
Combustion Products ◽  
Maximum Pressure ◽  
Gas Filtration ◽  
Two Phase ◽  
Powder Charge ◽  
Convective Burning ◽  
Multicomponent Gas ◽  
Ignition And Combustion

Increase of loading density could be considered as one of the ways of increasing muzzle velocity in guns. At the same time, reduction of maximum pressure requires increase in burning progressivity of the powder charge, which can be reached at the expense of coating of powder grains with polymer film and further compression to high density into block charge. Multidimensional numerical simulation of ignition and combustion of such charges is a relevant issue. Two-dimensional axisymmetric generalization of one-dimensional semianalytical model of convective burning of block charges is introduced. The gas-powder mixture is modeled by a two-phase nonequilibrium heterogeneous medium consisting of a multicomponent gas phase of the combustion products and a polydisperse condensed phase of the charge elements. Mathematical model and computational algorithm were validated through numerical simulation of the following problems: powder gas filtration in the dense charge, combustion of bulk and dense charges, consisting of 7-perforated grains, covered with film, in a closed vessel. Comparison of obtained results with experimental data demonstrates satisfactory predictive qualities of the model.

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