scholarly journals Efficiency enhancement of the vehicle fuel tank ventilation system by improving its architecture and design

2021 ◽  
Vol 2061 (1) ◽  
pp. 012096
Author(s):  
V V Glaviznin ◽  
G G Ter-Mkrtichyan ◽  
N A Mikerin
Keyword(s):  
Control Systems ◽  
Ventilation System ◽  
Fuel Vapor ◽  
Hydrocarbon Emissions ◽  
Efficiency Enhancement ◽  
Environmental Requirements ◽  
The Russian Federation ◽  
Harmful Substances ◽  
Architecture And Design ◽  
Fuel Evaporation

Abstract Hydrocarbon emissions from fuel evaporation contribute significantly to the total emissions of harmful substances from vehicles with forced spark ignition. To meet the legally established standards for limiting hydrocarbon emissions from evaporation, all current vehicles use fuel vapor control systems. The design of the system can vary and depends on the sales market of a particular vehicle. This article describes the development of this system for the market of the Russian Federation, as well as optimization for promising sales markets with more stringent environmental requirements.

Environmental and Climate Declarations as Tools for Exporting Russian Construction Materials

2020 ◽  
Vol 786 (11) ◽  
pp. 47-53
Author(s):  
A.V. DERBENEV ◽  
◽  
D.M. VADIVASOV ◽  
Keyword(s):  
Climate Change ◽  
Environmental Management ◽  
Sustainable Development Goals ◽  
Construction Materials ◽  
Modern Society ◽  
Environmental Agreements ◽  
Management Tools ◽  
Development Goals ◽  
Environmental Requirements ◽  
The Russian Federation

Environmental protection, climate change, and the protection of the planet’s biodiversity are becoming top priorities in modern society. Environmental agreements, while important and necessary, including for achieving sustainable development goals, impose additional restrictions on products and producers of these products. These restrictions can be used by countries to create barriers to the import of construction materials. Countries that have ratified environmental agreements may restrict the import of products that do not meet environmental requirements or criteria in one way or another. International environmental management tools are described, in particular environmental and climate declarations, which can serve as tools for solving the problem of possible restrictions and barriers in the export of construction materials produced in the Russian Federation.

scholarly journals THE ECOLOGICAL PROBLEMS OF THE RUSSIAN FEDERATION ARCTIC

2015 ◽  
pp. 148-152 ◽  
Author(s):  
N. L. Mamaeva ◽  
S. A. Petrov
Keyword(s):  
Russian Federation ◽  
Maximum Permissible Concentration ◽  
Surface Concentration ◽  
The Arctic ◽  
Arctic Zone ◽  
Atmospheric Air ◽  
Ecological Problems ◽  
The Russian Federation ◽  
Harmful Substances ◽  
Nenets Autonomous

The results of ecological researches in the Arctic zone of the Russian Federation (Purovski district of Yamal-Nenets Autonomous okrug) are presented. The characteristics of emissions in the atmospheric air in Ustpurovsk-Tazovsk (Samburg) and Purovsk geocreology areas (Tarko-Sale) are considered and also the surface concentration of harmful substances in atmospheric air is predicted. A calculation of dispersion of polluting substances in the atmosphere is made. Based on the obtained results the conclusions were drawn about exceeding of the maximum-permissible concentration in the air.

Analysis of the vaporization processes in the vehicle fuel tank. New equation for determining the vapor amount

Trudy NAMI ◽  
2021 ◽  
pp. 74-86
Author(s):  
G. G. Ter-Mkrtich'yan
Keyword(s):  
Saturated Vapor ◽  
Barometric Pressure ◽  
Fuel Tank ◽  
Hazardous Substances ◽  
Practical Significance ◽  
Fuel Vapor ◽  
Hydrocarbon Emissions ◽  
Fuel Temperature ◽  
Vapor Generation ◽  
Initial Fuel

Introduction (problem statement and relevance). Hydrocarbon emissions from vaporizationtank fuel contribute significantly to the total emissions of hazardous substances from vehicles equipped with spark ignition engines. To meet the established standards for limiting hydrocarbon emissions caused by evaporation, all modern vehicles use fuel vapor recovery systems, the optimal parameters of which require the availability and application of mathematical models and methods for their determination.The purpose of the research was to develop a model of vapor generation processes in the car fuel tank and a methodology for determining the main quantitative parameters of the vapor-air mixture.Methodology and research methods. The analysis of the processes of vapor generation in the fuel tank was carried out. It was shown that the mass of hydrocarbons generated in the steam space was directly proportional to its volume and did not depend on the amount of fuel in the tank.Scientific novelty and results. New analytical dependences of the vaporization amount on the saturated vapor pressure, barometric pressure, initial fuel temperature and fuel heating during parking have been obtained.Practical significance. A formula was obtained to estimate the temperature of gasoline boiling starting in the tank, depending on the altitude above sea level and the volatility of gasoline, determined by the pressure of saturated vapors. Using the new equations, the vaporization analysis in real situations (parking, idling, refueling, explosive concentration of vapors) was carried out.

Liner Design to Reduce Unburned Hydrocarbon Exhaust Emissions

2018 ◽  
Author(s):  
Paul S. Wang ◽  
Allen Y. Chen
Keyword(s):  
Natural Gas ◽  
Ventilation System ◽  
Hydrocarbon Emissions ◽  
Tracer Technique ◽  
Oil Consumption ◽  
Natural Gas Engines ◽  
Unburned Hydrocarbon ◽  
Crankcase Ventilation ◽  
Unburned Fuel ◽  
Careful Design

Large natural gas engines that introduce premixed fuel and air into the engine cylinders allow a small fraction of fuel to evade combustion, which is undesirable. The premixed fuel and air combust via flame propagation. Ahead of the flame front, the unburned fuel and air are driven into crevices, where conditions are not favorable for oxidation. The unburned fuel is a form of waste and a source of potent greenhouse gas emissions. A concept to vent unburned fuel into the crankcase through built-in slots in the liner during the expansion stroke has been tested. This venting process occurs before the exhaust valve opens and the unburned fuel sent into the crankcase can be recycled to the intake side through a closed crankcase ventilation system. The increased communication between the cylinder and the crankcase changes the ring pack dynamics, which results in higher oil consumption. Oil consumption was measured using a sulfur tracer technique. Careful design is required to achieve the best tradeoff between reductions in unburned hydrocarbon emissions and oil control.

Validation of the Isis-3D Computer Code for Simulating Large Pool Fires Under a Variety of Wind Conditions

2003 ◽  
Author(s):  
Miles Greiner ◽  
Ahti Sou-Anttila
Keyword(s):  
Heat Transfer ◽  
Radiation Heat Transfer ◽  
Temperature Response ◽  
Diffuse Radiation ◽  
Computer Code ◽  
Time Dependent ◽  
Fuel Vapor ◽  
View Factor ◽  
Pool Fires ◽  
Fuel Evaporation

The Isis-3D computational fluid dynamics/radiation heat transfer code was developed to simulate heat transfer from large fires. It models liquid fuel evaporation, fuel vapor and oxygen transport, chemical reaction and heat release, soot and intermediate species formation/destruction, diffuse radiation within the fire, and view factor radiation from the fire edge to nearby objects and the surroundings. Reaction rate and soot radiation parameters in Isis-3D have been selected based on experimental data. One-dimensional transient conduction modules calculate the response of simple objects engulfed in and near the flames. In this work, Isis-3D calculations were performed to simulate the conditions of three experiments that measured the temperature response of a 4.66-m-diameter culvert pipe located at the leeward edge of 18.9-m and 9.45-m diameter pool fires in crosswinds with average speeds of 2.0, 4.6 and 9.5 m/s. The measured wind conditions were used to formulate time-dependent velocity boundary conditions for a rectangular Isis-3D domain with 16,500 nodes. Isis-3D accurately calculated characteristics of the time-dependent temperature distributions in all three experiments. Accelerated simulations were also performed in which the pipe specific heat was reduced compared to the measured value by a factor of four. This artificially increased the speed at which the pipe temperature rose and allowed the simulated fire duration to be reduced by a factor of four. A 700 sec fire with moderately unsteady wind conditions was accurately simulated in 10 hours on a 2.4 GHz LINUX workstation with 0.5 GB of RAM.

scholarly journals A conceptual approach to defining a structure for spatially distributed network-centric system for controlling the tier of air defense missile cover

2020 ◽  
pp. 70-76
Author(s):  
В.Є. Шамко
Keyword(s):  
Control Systems ◽  
Effective Control ◽  
The Novel ◽  
Distributed Network ◽  
Conceptual Approach ◽  
Air Defense ◽  
Joint Forces ◽  
Spatially Distributed ◽  
The Russian Federation ◽  
Hybrid War

In the context of the Joint Forces operation in eastern Ukraine and the new challenges of the hybrid war on the part of the Russian Federation, there is an urgent need for finding possible ways of building an effective control system for a spatially distributed network-centered air defense missile cover system. The article presents a conceptual approach to the design of the structure that would be effective for controlling such a system, which is based on both the classical construction principles of control systems and the novel network-centric approach to design of control systems. The conceptual approach takes into account the peculiarities of building a spatially distributed tier of air defense missile cover.

scholarly journals Real Time Control Systems of a Fighter Aircraft

2020 ◽  
Author(s):  
Asha Garg ◽  
Uma H. R. ◽  
Usha G. ◽  
Amitabh Saraf
Keyword(s):  
Control System ◽  
Control Systems ◽  
Real Time ◽  
Flight Control ◽  
Real Time Control ◽  
Fighter Aircraft ◽  
Redundancy Management ◽  
Time Control ◽  
Environment Control ◽  
Architecture And Design

Most modern fighter aircraft are multi-role by design and rely heavily on a number of systems that are computer controlled in real time for achieving the most optimal performance. This paper presents three important real time control systems designed for the Indian Light Combat Aircraft. These are the flight control system, the anti-skid brake control system and the environment control system. Design objectives for these systems along with a description of their various hardware elements, software architecture and design concepts have been presented here. All the systems house extremely critical functions during different phases of flight, and so are designed for high degrees of reliability and extremely low failure probabilities. The concepts adopted for redundancy management, failure identification and failure handling are also presented.

scholarly journals Basics of Energy Supply Regulation in the Arctic Regions

Federalism ◽  
2020 ◽  
pp. 66-76
Author(s):  
A. A. Gasnikova
Keyword(s):  
Energy Supply ◽  
Legal Framework ◽  
The Arctic ◽  
Necessary Condition ◽  
Significant Extent ◽  
Economic Relations ◽  
Arctic Regions ◽  
Environmental Requirements ◽  
The Russian Federation ◽  
Regional Authorities

Energy supply is a necessary condition for supporting normal life and activities of humans. Problem of providing reliable and accessible energy supply becomes extremely important under the Arctic severe climate. Organization of energy supply is affected by many factors. It is suggested to consider natural-resource, economical, social, technological, ecological, and legal factors. Legal factors set legal framework for energy enterprises and energy consumers to act. Economic relations, social guarantees for energy consumers, technological and environmental requirements for energy industry are legally regulated. Thus, legal factors determine other factors of energy supply to significant extent. In this regard, an analysis of the powers and functions of federal and regional authorities in the field of energy supply regulation is relevant. Most of the powers of energy supply regulation are concentrated at the federal level. At the level of the subjects of the Russian Federation energy supply issues are regulated by regional authorities within the framework of their powers. Ensuring reliable energy supply to consumers requires coordinated actions of authorities and energy sector enterprises, taking into account the whole variety of considered factors.

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