METHODS OF MATHEMATICAL MODELING OF THE COMPRESSION RATIO EFFECT ON THE WORKING PROCESSES IN PRIMARY INTERNAL COMBUSTION ENGINES AS PART OF POWER PLANTS

2021 ◽  
Author(s):  
Aleksey Vladimirovich Naumov ◽  
Andrey Adievich Malozemov ◽  
Nikita Alekseevich Naumov
Keyword(s):  
Mathematical Modeling ◽  
Compression Ratio ◽  
Power Plants ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Ratio Effect ◽  
Working Processes

Possibility of using gas lubricant in the cylinders of internal combustion engines of transport vehicles

2021 ◽  
pp. 13-20
Author(s):  
Keyword(s):  
Internal Combustion Engine ◽  
Bearing Capacity ◽  
Power Plants ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Engine Piston ◽  
Suspension Stiffness ◽  
Gas Layer

The prospects of using the gas-static suspension of the internal combustion engine piston in transport vehicles and power plants are considered. The diagram of the piston and the method for calculating the stiffness and bearing capacity of the gas layer surrounding the piston are presented, as well as the results of experiments that showed the relevance of this method. The possibility of gas and static centering of the engine piston is confirmed. Keywords: internal combustion engine, piston, gasstatic suspension, stiffness, bearing capacity, gas medium. [email protected]

Heat and Power Plants and Their Automatic Control and Regulation Systems

2020 ◽  
pp. 106-130
Author(s):  
V.A. Markov
Keyword(s):  
Power Plant ◽  
Automatic Control ◽  
Power Plants ◽  
Internal Combustion Engines ◽  
Energy Transport ◽  
Fuel Efficiency ◽  
Internal Combustion ◽  
Technical Conference ◽  
Combustion Engines ◽  
Russian Scientific

The paper emphasizes the relevance of research aimed at further improving the systems of automatic control and regulation of heat and power plants, mainly plants with reciprocating internal combustion engines. The study assessed the current level of the development of these systems, and analyzed the prospects of their use as mobile and stationary heat and power plants. These plants are widely used in various sectors of the economy --- energy, transport, agriculture, so it appears important to describe the main directions of further improvement of these plants and their automatic control and regulation systems. The purpose of the research was to further increase the power indicators of heat and power plants, improve their fuel efficiency and exhaust gas toxicity, and enhance the dynamic qualities of internal combustion engines. In our study, we also examined the main directions of improving the fuel supply and air supply systems of engines, their work process, adaptation of engines to work on various alternative types of fuel. Findings of research show that it is necessary to expand the functional capabilities of control and regulation systems, implement integrated adaptive control of a heat and power plant and its systems, use electronic microprocessor devices in the structure of regulators, enhance the multi-parameter efficiency of the operation of a heat and power plant and its elements, taking into account the whole set of parameters of this plant The paper was based on the materials of the reports of the all-Russian scientific and technical conference n.a. Professor V.I. Krutov (29.01.2020)

scholarly journals Analysis of residual gases of internal combustion engines at working on biogas and their effects on the environment

2020 ◽  
pp. 101-108
Author(s):  
T. V. Dykun ◽  
V. I. Artym ◽  
Ya. M. Demianchuk ◽  
F. V. Kozak ◽  
L. I. Haieva
Keyword(s):  
Power Plants ◽  
Alternative Fuels ◽  
Internal Combustion Engines ◽  
Motor Vehicle ◽  
Motor Fuel ◽  
Internal Combustion ◽  
Developed Countries ◽  
The United States ◽  
Combustion Engines ◽  
By Products

Given the limited resources of Ukraine in petroleum fuels for internal combustion engines, the use of alternative fuels is quite relevant. One of their sources is biogas from livestock by-products and garbage dump. Ukraine has significant volumes of these renewable sources, the potential of which reaches more than 100 million tons of conventional fuel. Unfortunately, this resource is rarely used. In developed countries, biogas is widely used for electricity generation in power plants with internal combustion engines. Today in the United States the volume of biogas production is about 500 million m3 / year, in France – 40 million m3 / year. In the Czech Republic, Austria, Denmark, Finland and other countries, biogas is used as a motor fuel. Business Concerns Volvo, Scania produce buses running on biogas. In Ukraine, gas from landfills and livestock by-products is mostly released into the atmosphere or burned by flares, polluting the surrounding air. This causes additional greenhouse gas emissions. It is known that the main source of air pollution is vehicles. Exhaust, i.e. residual gases are considered toxic. The World Motor Vehicle Park annually emits up to 260 million tons of carbon monoxide, 40 million tons of volatile hydrocarbons, nitrogen oxides and others. The composition of the residual gases of the internal combustion en-gine depends on the component composition of the sources of fuel and, of course, on the mode of operation of the internal combustion engine In the given article the structure of residual gases of internal combustion engines at work on biogas is analyzed and their influence on environment is generalized. Based on analytical calculations, it is determined how the amount of residual gas components changes depending on the excess air ratio and the per-centage of methane in biogas. Recommendations for improving the performance of internal combustion engines on biogas by using it in mixtures with natural gas are given. According to the research results, the corresponding graphical dependences are constructed.

scholarly journals INFLUENCE OF USING ALTERNATIVE TYPES OF FUEL ON CHARACTERISTICS OF WORKING PROCESSES OF INTERNAL COMBUSTION ENGINES

2018 ◽  
pp. 24-32 ◽  
Author(s):  
Sergei Pavlovich Glushkov ◽  
Victor Ivanovich Kochergin ◽  
Vasiliy Victorovich Krasnikov
Keyword(s):  
Combustion Chamber ◽  
Synthesis Gas ◽  
Internal Combustion Engines ◽  
Pressure Rise ◽  
Hydrocarbon Fuel ◽  
Internal Combustion ◽  
Intake Manifold ◽  
Combustion Engines ◽  
Combustion Heat ◽  
Working Processes

In application of alternative types of fuel it is necessary to consider the influence of changing specific heat of fuel combustion and a process of fuel supply on parameters of working processes and external characteristics of internal combustion engines. Besides, it is necessary to consider a possible emergence of backfires in the inlet pipeline and increasing concentration of nitrogen oxides as temperature raises in the combustion chamber. It is offered to consider the influence of changing the kinetics of fuel burning under the change of fuel-air mixture composition on the process of pressure rise in the combustion chamber and, therefore, on the speed and acceleration of the piston, size of an impulse of moving parts, parameters of irregularity of rotating speed and vibration loading of the engine. In terms of using hydrogenous synthesis gas, there has been carried out the analysis of possible influence of its main components on parameters of working process of the engine. The results of theoretical calculation of an increase of combustion heat of working mixture and of pilot testing prove an increase of combustion heat and decrease of total fuel consumption at different levels of feeding synthesis gas to the engine intake manifold. The need to observe a certain proportion of hydrogen supply relative to the main hydrocarbon fuel has been noted. The research results prove that changing characteristics of the fuel used leads to a change of a type of vibration load of the power unit.

Hybrid Dual-Fuel Combined Cycles for Small-Scale Applications With Internal Combustion Engines

2003 ◽  
Author(s):  
Miroslav P. Petrov ◽  
Thomas Stenhede ◽  
Andrew R. Martin ◽  
Laszlo Hunyadi
Keyword(s):  
Natural Gas ◽  
Power Plants ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combined Cycle ◽  
Small Scale ◽  
Dual Fuel ◽  
Combustion Engines ◽  
Combined Cycles ◽  
Topping Cycle

Hybrid dual-fuel combined cycle power plants employ two or more different fuels (one of which is typically a solid fuel), utilized by two or more different prime movers with a thermal coupling in between. Major thermodynamic and economic advantages of hybrid combined cycle configurations have been pointed out by various authors in previous studies. The present investigation considers the performance of natural gas and biomass hybrid combined cycles in small scale, with an internal combustion engine as topping cycle and a steam boiler/turbine as bottoming cycle. A parametric analysis evaluates the impact of natural gas to biomass fuel energy ratio on the electrical efficiency of various hybrid configurations. Results show that significant performance improvements with standard technology can be achieved by these hybrid configurations when compared to the reference (two independent, single-fuel power plants at the relevant scales). Electrical efficiency of natural gas energy conversion can reach up to 57–58% LHV, while the efficiency attributed to the bottoming fuel rises with up to 4 percentage points. In contrast to hybrid cycles with gas turbines as topping cycle, hybrid configurations with internal combustion engines show remarkably similar performance independent of type of configuration, at low shares of natural gas fuel input.

Mathematical modeling and simulation of high-speed cam mechanisms to minimize residual vibrations

2014 ◽  
Vol 228 (13) ◽  
pp. 2402-2415 ◽  
Author(s):  
Halit Kaplan
Keyword(s):  
Mathematical Modeling ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Dimensionless Analysis ◽  
Multipliers Method ◽  
Cam Follower ◽  
Cam Profile

Mathematical modeling, simulation, and optimum design of equivalent one degree-of-freedom high-speed cam mechanisms used for internal combustion engines are investigated in this study. The dynamic equation governing the dynamic behavior of a typical high-speed cam–follower system of an internal combustion engine has been simplified using dimensionless analysis method. The resulting model is then used to find the optimum cam shape to reduce the residual vibrations in the follower part of the system. The Lagrange multipliers method is utilized to minimize the sum of squared error (deviation from the cam profile) over one period under continuity and smoothness constraints.

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