Fundamental investigation of unipolar and RF corona in atmospheric air

2021 ◽  
Vol 28 (12) ◽  
pp. 123502
Author(s):  
I. A. Aponte ◽  
B. Esser ◽  
James C. Dickens ◽  
John J. Mankowski ◽  
Andreas A. Neuber
Keyword(s):  
Atmospheric Air ◽  
Fundamental Investigation

Fundamental Investigation of a Gas Circuit Breaker in University

2010 ◽  
Vol 130 (12) ◽  
pp. 1047-1052
Author(s):  
Hiroaki Toda ◽  
Masayuki Hikita ◽  
Hisatoshi Ikeda
Keyword(s):  
Circuit Breaker ◽  
Fundamental Investigation

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.

Electrical Characteristics of Atmospheric Air Corona Plasma by Multi-pin Electrodes

2019 ◽  
Vol 14 (3) ◽  
pp. 226
Author(s):  
Khanit Matra ◽  
Yottana Tanakaran ◽  
Teerawat Temponsub ◽  
Suphanat Nimbua ◽  
Phanuwat Thab-in ◽  
...  
Keyword(s):  
Electrical Characteristics ◽  
Atmospheric Air ◽  
Corona Plasma

Fundamental Investigation of a Grating Consisting of InSb-Coated Dielectric Cylinders on a Substrate in the THz Regime

2020 ◽  
Vol E103.C (11) ◽  
pp. 567-574 ◽  
Author(s):  
Jun SHIBAYAMA ◽  
Sumire TAKAHASHI ◽  
Junji YAMAUCHI ◽  
Hisamatsu NAKANO
Keyword(s):  
Fundamental Investigation

A 2D MODELLING OF LASER-GAS BREAKDOWN IN ATMOSPHERIC AIR

2006 ◽  
Vol 10 (2) ◽  
pp. 265-280
Author(s):  
P. Pignolet ◽  
E. Schall ◽  
S. Soubacq
Keyword(s):  
Atmospheric Air ◽  
2D Modelling ◽  
Gas Breakdown

Measurements of KrF laser-induced O2 fluorescence in high-temperature atmospheric air

1993 ◽  
Author(s):  
JAY GRINSTEAD ◽  
GABRIEL LAUFER ◽  
JAMES MCDANIEL, JR.
Keyword(s):  
High Temperature ◽  
Atmospheric Air ◽  
Krf Laser

POLLUTION OF ATMOSPHERIC AIR IN THE BASIN OF THE RIVER ERTIS BY EMIS-SIONS OF SULFUR DIOXIDE (On an example of the city of Ust-Kamenogorsk)

2017 ◽  
Vol 3 (52) ◽  
pp. 76-87
Author(s):  
A.K. Tolepbayeva ◽  
◽  
G.M. Urazbayeva ◽  
Keyword(s):  
Sulfur Dioxide ◽  
Atmospheric Air ◽  
The City

OUTDOOR TESTS OF A TOWED BOAT MODEL WITH FUEL COMBUSTION IN A BOTTOM CAVITY

2020 ◽  
Author(s):  
S. M. FROLOV ◽  
◽  
S. V. Platonov ◽  
K. A. AVDEEV ◽  
V. S. AKSENOV ◽  
...  
Keyword(s):  
Drag Force ◽  
Direct Contact ◽  
Propulsion System ◽  
Hydrodynamic Drag ◽  
Atmospheric Air ◽  
System A ◽  
Bottom Cavity ◽  
Gas Cavity ◽  
System Power ◽  
Gas Supply

To reduce the hydrodynamic drag force to the movement of the boat, an artificial gas cavity is organized under its bottom. Such a cavity partially insulates the bottom from direct contact with water and provides “gas lubrication” by means of forced supply of atmospheric air or exhaust gases from the main propulsion system. A proper longitudinal and transverse shaping of the gas cavity can significantly (by 20%-30%) reduce the hydrodynamic drag of the boat at low (less than 3%) consumption of the propulsion system power for gas supply.

Methodical and organizational aspects in designing sanitary protection zones for a group of enterprises or industrial centers as a toll for complex atmospheric air quality assessment

2019 ◽  
pp. 940-944
Author(s):  
S. Yu. Zagorodnov ◽  
I. V. May
Keyword(s):  
Air Quality ◽  
Industrial Complex ◽  
Design Work ◽  
Atmospheric Air ◽  
Protection Zones ◽  
Industrial Enterprises ◽  
Economic Entity ◽  
Outer Border ◽  
Zone Of Influence ◽  
Environmental Measures

Introduction. Sanitary legislation of the Russian Federation provides for the organization of sanitary protection zones of industrial enterprises located in the industrial hub. However, the justification procedure, establishing and monitoring boundaries of a single sanitary zones not fully resolved. This determines the practice of organization by economic entities of individual zones separating production from residential development. This situation complicates the adequate assessment of real pollution, as well as the reasonable development of programs (plans) of environmental measures. Identification of the sources that create poor air quality and public health risks is becoming extremely problematic.The aim of the study is to develop and test recommendations for the organization and methodological support of the design of a single sanitary protection zone of a group of enterprises in the current urban development.Materials and methods. The object of the study is an industrial hub formed by 5 industrial enterprises and located on the territory of a large urban settlement with a population of more than 450 thousand people. The city administration carried out a number of organizational measures that ensured the simultaneous inventory of emissions of enterprises and the design of the general sanitary zone of the industrial complex. The design work was carried out in full accordance with the current regulatory framework.Results. The verified unified database of 102 sources of chemical emissions and 113 sources of noise provided the possibility of summary calculations and obtaining the most correct results for surface concentrations in the zone of influence of the industrial hub. The program of quality control of atmospheric air defining the contribution of each economic subject to carrying out researches is formed. This made it possible to ensure the control of all priority contaminants at the outer border of the sanitary zone and reduce the costs of each separate economic entity. Zones of responsibility of each enterprise within borders of a uniform sanitary zone for tasks of maintenance of the standard maintenance of the territory are allocated.Conclusions. The obtained results confirmed the feasibility of designing unified sanitary protection zones for economic entities located in the industrial hub.

On the issue of optimization of atmospheric air quality monitoring for the implementation of the Federal project «Clean Air»

2019 ◽  
pp. 931-936
Author(s):  
I. V. May ◽  
A. A. Kokoulina ◽  
S. Yu. Balashov
Keyword(s):  
Public Health ◽  
Air Quality ◽  
Environmental Monitoring ◽  
Monitoring System ◽  
Protection Measures ◽  
Atmospheric Air ◽  
Monitoring Programs ◽  
Clean Air ◽  
Effectiveness And Efficiency ◽  
The City

Introduction. The city of Chita of Zabaikalsky region is one of the cities of Russia, priority on level of pollution of atmosphere. Of the order of 130 impurities emitted by the sources of the city, 12 are monitored at 5 posts of the Roshydromet network. Maximum monthly average concentrations are formed by benz (a) pyrene (up to 56.8 MPC), hydrogen sulfide (12.3 MPC), suspended particles (up to 4PDC), phenol (up to 3.6 MPC). Significant emissions (59.73 thousand tons in 2018) are aggravated by the use of coal as a fuel by heat and power enterprises and the private sector, climatic and geographical features. Within the framework of the Federal project “Clean Air” of the national project “Ecology”, it is envisaged to reduce the gross emission of pollutants into the atmosphere of Chita by 8.75 thousand tons by 2024, which should lead to a significant improvement in the safety and quality of life of citizens. It is necessary to identify the most “risky “components of pollution for health.It is important to understand: whether the environmental monitoring system reflects the real picture of the dangers posed by pollution of the city’s atmosphere; whether there is a need to optimize the monitoring system for the subsequent assessment of the effectiveness and efficiency of measures; what impurities and at what points should be monitored in the interests of the population, administration and economic entities implementing air protection measures.The aim of the study is to develop recommendations for optimizing the program of environmental monitoring of air quality in the city of Chita, taking into account the criteria of danger to public health for the subsequent evaluation of the effectiveness and effectiveness of the Federal project “Clean Air”.Materials and methods. Justification of optimization of monitoring programs was carried out through the calculation of hazard indices, considering: the mass of emissions and toxicological characteristics of each chemical; the population under the influence. A vector map of the city with a layer “population density” was used as a topographic base. The indices were calculated for regular grid cells covering the residential area. For each cell, the repeatability of winds of 8 points from the priority enterprises and the population within the calculated cell were taken into account. As a result, each calculation cell was characterized by a total coefficient, taking into account the danger of potential impacts of emissions. Based on the results of the assessments, recommendations were formulated to optimize the placement of posts in the city and the formation of monitoring programs.Results. Indices of carcinogenic danger to the health of the population of Chita ranged from 584,805. 96 to 0.03 (priorities: carbon (soot), benzene, benz (a) pyrene); indices of non-carcinogenic danger — from 1,443,558. 24 to 0.00 (priorities: sulfur dioxide, inorganic dust containing 70–20% SiO2, fuel oil ash). The greatest danger to public health stationary sources of emissions form in the North-Western, Western and South-Eastern parts of the city. Roshydromet posts in these zones are absent.Conclusions. As part of the objectives of the project “Clean Air”, it is recommended to Supplement the existing state network of observations of atmospheric air quality in Chita with two posts; to include manganese, xylene, vanadium pentoxide in the monitoring programs, to carry out the determination of Benz(a)pyrene et all posts, which will allow to fully and adequately assess the danger of emissions of economic entities, as well as the effectiveness and efficiency of the provided air protection measures.

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