scholarly journals Theoretical studies of natural gas vaporization of an air-methane mixture in a diesel engine cylinder

2021 ◽  
Vol 7 (Special) ◽  
pp. 1-1
Author(s):  
Ivan Storozhev ◽  
Sergey Romanov ◽  
Timofey Alushkin ◽  
Anatoly Palyanov
Keyword(s):  
Diesel Engine ◽  
Natural Gas ◽  
Combustion Engine ◽  
Experimental Studies ◽  
Working Fluid ◽  
Thermal Calculation ◽  
Theoretical Studies ◽  
Engine Cylinder ◽  
Methane Mixture ◽  
Gas Nozzle

This article presents theoretical studies of the vaporization of natural gas of an air-methane mixture in a diesel engine cylinder. These studies were conducted in order to find a rational volume of methane supplied to the cylinder of a diesel engine. Having carried out a thermal calculation of the working processes of the gas engine, we obtained the size of the gas droplet supplied to the engine cylinder, which should have a size of no more than 0.405 mm. Having evaluated the experimental studies conducted in this area, the dependence of the nozzle diameter of the nozzle and the diameter of the gas droplet was revealed, it was determined that with a pressure drop on the gas nozzle equal to 0.2 MPa, the diameter of the gas droplet practically coincides with the diameter of the nozzle. Based on this, the diameter of the nozzle of the gas nozzle sprayer is not more than 0.35...0.4 mm. The conclusion of this article is that it is possible to determine the optimal volume of gas supplied and assess the real picture of the processes taking place in the cylinder of a diesel engine only. Keywords: INTERNAL COMBUSTION ENGINE, WORKING FLUID, FUEL, VAPORIZATION, GAS, COMBUSTION

scholarly journals Waste heat recovery from a heavy-duty natural gas engine by Organic Rankine Cycle

2020 ◽  
Vol 197 ◽  
pp. 06023
Author(s):  
Antonio Mariani ◽  
Biagio Morrone ◽  
Maria Vittoria Prati ◽  
Andrea Unich
Keyword(s):  
Natural Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Combustion Engine ◽  
Thermal Power ◽  
Working Fluid ◽  
Maximum Pressure ◽  
Fluid Temperature ◽  
Road Transportation

Waste heat recovery can be a key solution for improving the efficiency of energy conversion systems. Organic Rankine Cycles (ORC) are a consolidated technology for achieving such target, ensuring good efficiencies and flexibility. ORC systems have been mainly adopted for stationary applications, where the limitations of layout, size and weight are not stringent. In road transportation propulsion systems, the integration between the powertrain and the ORC system is difficult but still possible. The authors investigated an ORC system bottoming a spark ignited internal combustion engine (ICE) powering a public transport bus. The bus, fuelled by natural gas, was tested in real driving conditions. Exhaust gas mass flow rate and temperature have been measured for calculating the thermal power to be recovered in the ORC plant. The waste heat was then used as energy input in a model simulating the performance of an ORC system. The heat transfer between the exhaust gases and the ORC fluid is crucial for the ORC performance. For this reason, attention was paid to considering the interaction between hot fluid temperature and ORC maximum pressure. ORC performance in terms of real cycle efficiency and power produced were calculated considering n-Pentane as working fluid. The fuel consumption was reduced from 271.5 g/km to 261.4 g/km over the driving cycle, corresponding to 3.7% reduction.

Investigation of the Possibilities of Using Soybean Oil as an Ecological Additive to Petroleum Diesel Fuel

2022 ◽  
pp. 39-52
Author(s):  
S.N. Devyanin ◽  
V.A. Markov ◽  
A.G. Levshin ◽  
T.P. Kobozeva ◽  
V.A. Neverov
Keyword(s):  
Diesel Engine ◽  
Soybean Oil ◽  
Diesel Fuel ◽  
Alternative Fuels ◽  
Combustion Engine ◽  
Raw Materials ◽  
Experimental Studies ◽  
Chemical Properties ◽  
Promising Alternative ◽  
Plant Raw Materials

One of the most important areas of internal combustion engine improvement is its adaptation to work on alternative fuels. Motor fuels obtained from renewable plant raw materials are considered to be promising alternative fuels. The article considers the possibility of using soybean oil as an ecological additive in petroleum diesel fuel. The features of soybean oil production and the physico-chemical properties of soybean oil and a mixture containing 80 % (by volume) of petroleum diesel fuel and 20 % of soybean oil are researched. Computational studies of the processes of fuel atomization and mixture formation in the D-245 diesel engine operating on mixtures of petroleum diesel fuel and seed oil have been performed. Experimental studies of the D-245 diesel engine operating on petroleum diesel fuel and the specified blended fuel have been carried out. Conversion of a diesel engine from petroleum fuel to mixed one leads to a decrease in integral emissions per test cycle: nitrogen oxides by 19.1 %, carbon monoxide — by 10.5 %, unburned hydrocarbons - by 8.9 %.

scholarly journals Exergy, Economic, and Life-Cycle Assessment of ORC System for Waste Heat Recovery in a Natural Gas Internal Combustion Engine

Resources ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 2 ◽  
Author(s):  
Guillermo Valencia Ochoa ◽  
Javier Cárdenas Gutierrez ◽  
Jorge Duarte Forero
Keyword(s):  
Life Cycle ◽  
Natural Gas ◽  
Waste Heat ◽  
Combustion Engine ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Exergy Destruction ◽  
Tube Heat Exchanger ◽  
Exhaust Heat

In this article, an organic Rankine cycle (ORC) was integrated into a 2-MW natural gas engine to evaluate the possibility of generating electricity by recovering the engine’s exhaust heat. The operational and design variables with the greatest influence on the energy, economic, and environmental performance of the system were analyzed. Likewise, the components with greater exergy destruction were identified through the variety of different operating parameters. From the parametric results, it was found that the evaporation pressure has the greatest influence on the destruction of exergy. The highest fraction of exergy was obtained for the Shell and tube heat exchanger (ITC1) with 38% of the total exergy destruction of the system. It was also determined that the high value of the heat transfer area increases its acquisition costs and the levelized cost of energy (LCOE) of the thermal system. Therefore, these systems must have a turbine technology with an efficiency not exceeding 90% because, from this value, the LCOE of the system surpasses the LCOE of a gas turbine. Lastly, a life cycle analysis (LCA) was developed on the system operating under the selected organic working fluids. It was found that the component with the greatest environmental impact was the turbine, which reached a maximum value of 3013.65 Pts when the material was aluminum. Acetone was used as the organic working fluid.

scholarly journals Analysis of test results of a household absorption refrigerating appliance on an electric and gas source of thermal energy

2021 ◽  
Vol 4 (1(60)) ◽  
pp. 49-53
Author(s):  
Daniyorbek Adambayev ◽  
Alexander Titlov
Keyword(s):  
Natural Gas ◽  
Experimental Studies ◽  
Environmentally Friendly ◽  
Operating Conditions ◽  
Hot Water ◽  
Operating Costs ◽  
Working Fluid ◽  
Electric Heater ◽  
Absorption Refrigeration ◽  
Waste Products

One of the biggest challenges for refrigeration systems is their conversion to environmentally friendly refrigerants. This attracts the attention of developers of household refrigeration equipment to absorption refrigeration devices (ARD), which include an absorption refrigeration unit (ARU). ARD working fluid consists of natural components - ammonia water solution with the addition of an inert gas (hydrogen). Therefore, the use of ARU can be considered as one of the options for transferring to environmentally friendly refrigerants. In recent years, in connection with the rapidly developing gasification of the population of Europe, an alternative has arisen - the operation of household ARD on natural gas. Natural gas can become an alternative to electrical energy in stationary operating conditions of household refrigeration appliances. Thus, the object of the study was a single-chamber household refrigerator with a low-temperature compartment "Kiev-410" (Ukraine). In this paper, the study is aimed at comparing the thermal modes of operation and the costs of operating a household ARD on electric energy and natural gas. To solve this, it was necessary to determine the temperatures at the characteristic points of the refrigeration apparatus and in the chamber, as well as the energy consumption of the absorption-type apparatus in accordance with regulatory documents, at various values of the thermal load on the thermosyphon and various ambient temperatures. The studies were carried out at elevated outdoor temperatures: 28–33 ° С. The range of thermal loads on the ARU thermosyphon electric heater was 50–130 W. The range of numerical values of natural gas consumption in the burner was (2.8–8.8) • 10-6 m3/s. In the process of conducting experimental studies of household ARD, results were obtained showing the economic prospects of working in stationary conditions on natural gas. At the same time, ARD of increased useful volume (200 dm3 and above) has the greatest prospects. The daily operating costs in them are 0.078...0.084 USD, which is 23...27 % lower than the case of using electricity. When the ARU thermosyphon is built into the heating and hot water supply system, it becomes possible to use the temperature potential of the waste products of combustion and completely eliminate operating costs.

Experimental Studies on Performance and Emission Analysis in Diesel Engine Using Bio-Fuel (Neem Oil)

2013 ◽  
Vol 768 ◽  
pp. 255-261 ◽  
Author(s):  
N. Kanthavelkumaran ◽  
P. Seenikannan
Keyword(s):  
Diesel Engine ◽  
Combustion Engine ◽  
Experimental Studies ◽  
Acid Value ◽  
Pollutant Emissions ◽  
Neem Oil ◽  
Fuel Component ◽  
Emission Analysis ◽  
Performance And Emission ◽  
Medicinal Properties

In present scenario Bio-fuel act as the major role in todays fuel compensation. In India Neem tree is a broadly grown up termed as a divine tree due to its large revalance in many areas of study. The current research study is projected to consider aspect related to the possibility of preparation of Biodiesel from Neem oil. This research deals with Biodiesel preparation from neem oil, which is mono ester prepared using transesterification process. Biodiesel is a safe substitute fuel to replace established petroleum diesel. It has maximum lubricity is a clean burning fuel and can be a fuel component for use in existing unmodified diesel engine. Neem (Azadirachita Indica) is a tree. Various habitual uses of pure neem oil in agriculture, medicine, etc. Neem oil has natural fungicidal, pesticidal, and medicinal properties. Neem a natures gift it categorized in to non edible oil and mainly used in medicine and cosmetic product. Biodiesel has been gaining increased concentration from Internal Combustion Engine researcher in observation of the energy crisis and increasing environmental problems. Neem oil is being considered for biodiesel and more research is being done in this area and also lot of research going on. Biodiesel designed for complete compatibility with petroleum diesel and can be blended in any ratio from additive levels to 100% Biodiesel. The fuel properties of biodiesel including kinematic viscosity and acid value were checked. The engine power and pollutant emissions characteristics under different biodiesel percentages were also studied. Experiments demonstrated in the single cylinder diesel engine that the biodiesel produced using neem oil could reduce smoke and Carbon monoxide emissions, extensively while the NOx emission changed a little. Thus, the ester of this oil can be used as eco-friendly substitute fuel for (C I) diesel engine.

АКУСТИЧНА ПОМІТНІСТЬ БЕЗПІЛОТНИХ ЛІТАЛЬНИХ АПАРАТІВ З СИЛОВИМИ УСТАНОВКАМИ НА БАЗІ ПОРШНЕВИХ ДВИГУНІВ

2020 ◽  
pp. 62-80
Author(s):  
В. В. Руденко ◽  
И. В. Калужинов ◽  
Н. А. Андрущенко
Keyword(s):  
Control System ◽  
Internal Combustion Engine ◽  
Power Plants ◽  
Combustion Engine ◽  
Spectral Characteristics ◽  
Experimental Studies ◽  
Internal Combustion ◽  
Detection Range ◽  
Acoustic Signature ◽  
Static Conditions

The presence in operation of many prototypes of UAVs with propeller propellers, the use of such devices at relatively low altitudes and flight speeds makes the problem of noise reduction from UAVs urgent both from the point of view of acoustic imperceptibility and ecology.The aim of the work is to determine a set of methods that help to reduce the visibility of UAVs in the acoustic range. It is shown that the main source of noise from the UAV on the ground is the power plant, which includes the engine and the propeller. The parameters of the power plants influencing the processes that determine the acoustic signature of the UAV were investigated. A comprehensive analysis of the factors affecting visibility was carried out. The power plants include two-stroke and four-stroke engines, internal combustion and two-blade propellers. The use of silencers on the exhaust of the internal combustion engine was considered. The spectral characteristics of the acoustic fields of the propeller-driven power plants for the operating sample of the UAV "Eco" were obtained. The measurements were carried out in one-third octave and 1/48 octave frequency bands under static conditions. The venue is the KhAI airfield. Note that the propellers that were part of the power plants operated at Reynolds numbers (Re0,75<2*105), which can significantly affect its aerodynamic and acoustic characteristics. It is shown that when choosing a UAV control system, one should take into account the fact that two-stroke piston engines are the dominant source in the noise of propeller-driven control systems in the absence of a hood and mufflers in the intake and exhaust tracts. The use of a four-stroke internal combustion engine significantly reduces the noise of the control system. In the general case, the position of the boundaries of the zone of acoustic visibility of a UAV at the location of the observer is determined by the ratio between the intensity of acoustic radiation perceived by the observer from the UAV and the intensity of sound corresponding to the natural acoustic background and depends on the degree of manifestation of acoustic effects accompanying the propagation of sound in a turbulent atmosphere - the refraction of sound waves. Absorption and dissipation of acoustic energy. The calculation and comparison of the UAV detection range was carried out taking into account the existing natural maskers.The results of experimental studies are presented that allow assessing the degree of acoustic signature of the UAV. A set of measures aimed at reducing the intensity of the acoustic signature of the UAV in various regions of the radiation spectrum has been determined.

Effect of Chemical Hythane Composition on Pressure in Combustion Chamber of Engine

2019 ◽  
pp. 36-42
Author(s):  
A. P. Shaikin ◽  
I. R. Galiev
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Power Plants ◽  
Engine Speed ◽  
Combustion Engine ◽  
Fuel Mixture ◽  
Maximum Pressure ◽  
Chamber Volume ◽  
Excess Air ◽  
Scientific Papers

The article analyzes the influence of chemical composition of hythane (a mixture of natural gas with hydrogen) on pressure in an engine combustion chamber. A review of the literature has showed the relevance of using hythane in transport energy industry, and also revealed a number of scientific papers devoted to studying the effect of hythane on environmental and traction-dynamic characteristics of the engine. We have studied a single-cylinder spark-ignited internal combustion engine. In the experiments, the varying factors are: engine speed (600 and 900 min-1), excess air ratio and hydrogen concentration in natural gas which are 29, 47 and 58% (volume).The article shows that at idling engine speed maximum pressure in combustion chamber depends on excess air ratio and proportion hydrogen in the air-fuel mixture – the poorer air-fuel mixture and greater addition of hydrogen is, the more intense pressure increases. The positive effect of hydrogen on pressure is explained by the fact that addition of hydrogen contributes to increase in heat of combustion fuel and rate propagation of the flame. As a result, during combustion, more heat is released, and the fuel itself burns in a smaller volume. Thus, the addition of hydrogen can ensure stable combustion of a lean air-fuel mixture without loss of engine power. Moreover, the article shows that, despite the change in engine speed, addition of hydrogen, excess air ratio, type of fuel (natural gas and gasoline), there is a power-law dependence of the maximum pressure in engine cylinder on combustion chamber volume. Processing and analysis of the results of the foreign and domestic researchers have showed that patterns we discovered are applicable to engines of different designs, operating at different speeds and using different hydrocarbon fuels. The results research presented allow us to reduce the time and material costs when creating new power plants using hythane and meeting modern requirements for power, economy and toxicity.

DIESEL ENGINE OPERATION IN USE OF FUEL WITH ADDITIVES

2018 ◽  
pp. 18-24
Author(s):  
Petar Kazakov ◽  
Atanas Iliev ◽  
Emil Marinov
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Combustion Engines ◽  
Engine Operation ◽  
Factors Affecting ◽  
Operating Modes ◽  
Positive Effects

Over the decades, more attention has been paid to emissions from the means of transport and the use of different fuels and combustion fuels for the operation of internal combustion engines than on fuel consumption. This, in turn, enables research into products that are said to reduce fuel consumption. The report summarizes four studies of fuel-related innovation products. The studies covered by this report are conducted with diesel fuel and usually contain diesel fuel and three additives for it. Manufacturers of additives are based on already existing studies showing a 10-30% reduction in fuel consumption. Comparative experimental studies related to the use of commercially available diesel fuel with and without the use of additives have been performed in laboratory conditions. The studies were carried out on a stationary diesel engine СМД-17КН equipped with brake КИ1368В. Repeated results were recorded, but they did not confirm the significant positive effect of additives on specific fuel consumption. In some cases, the factors affecting errors in this type of research on the effectiveness of fuel additives for commercial purposes are considered. The reasons for the positive effects of such use of additives in certain engine operating modes are also clarified.

Numerical study of fluid dynamic flow within an internal combustion engine cylinder

2017 ◽  
Author(s):  
Ana Marta Souza ◽  
Antônio César Valadares de Oliveira ◽  
Enrico Temporim Ribeiro ◽  
Francisco Souza ◽  
Marcelo Colombo Chiari
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Numerical Study ◽  
Fluid Dynamic ◽  
Internal Combustion ◽  
Dynamic Flow ◽  
Engine Cylinder

USE OF NORTHERN ECOTYPE SOYBEANS FOR BIOFUEL PRODUCTION

2020 ◽  
pp. 22-30
Author(s):  
SERGEY N. DEVYANIN ◽  
◽  
VLADIMIR A. MARKOV ◽  
ALEKSANDR G. LEVSHIN ◽  
TAMARA P. KOBOZEVA ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Soybean Oil ◽  
Diesel Fuel ◽  
Experimental Studies ◽  
Motor Fuel ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
Exhaust Gases ◽  
Oil Productivity ◽  
Toxic Components

The paper presents the results of long-term research on the oil productivity and chemical composition of soybean oil of the Northern ecotype varieties in the Central Non-Black Earth Region. The authors consider its possible use for biodiesel production. Experiments on growing soybeans were carried out on the experimental fi eld of Russian State Agrarian University –Moscow Timiryazev Agricultural Academy (2008-2019) on recognized ultra-early ripening varieties of the Northern ecotype Mageva, Svetlaya, Okskaya (ripeness group 000). Tests were set and the research results were analyzed using standard approved methods. It has been shown that in conditions of high latitudes (57°N), limited thermal resources of the Non-Chernozem zone of Russia (the sum of active temperatures of the growing season not exceeding 2000°С), the yield and productivity of soybeans depend on the variety and moisture supply. Over the years, the average yield of soybeans amounted to 1.94 … 2.62 t/ha, oil productivity – 388 … 544 kg/ha, oil content – 19…20%, the content of oleic and linoleic fatty acids in oil – 60%, and their output from seeds harvested – 300 kg/ha. It has been established that as soybean oil and diesel fuel have similar properties,they can be mixed by conventional methods in any proportions and form stable blends that can be stored for a long time. Experimental studies on the use of soybean oil for biodiesel production were carried out on a D-245 diesel engine (4 ChN11/12.5). The concentrations of toxic components (CO, CHx, and NOx) in the diesel exhaust gases were determined using the SAE-7532 gas analyzer. The smoke content of the exhaust gases was measured with an MK-3 Hartridge opacimeter. It has been experimentally established that the transfer of a diesel engine from diesel fuel to a blend of 80% diesel fuel and 20% lubrication oil leads to a change in the integral emissions per test cycle: nitrogen oxides in 0.81 times, carbon monoxide in 0.89 times and unburned hydrocarbons in 0.91 times, i.e. when biodiesel as used as a motor fuel in a serial diesel engine, emissions of all gaseous toxic components are reduced. The study has confi rmed the expediency of using soybeans of the Northern ecotype for biofuel production.

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