scholarly journals Dual-Fuel Engine, Otto Cycle and Diesel Cycle

2009 ◽  
Vol 44 (6) ◽  
pp. 978-978
Author(s):  
Senichi Sasaki
Keyword(s):  
Dual Fuel ◽  
Otto Cycle ◽  
Diesel Cycle

RESEARCH OF INDICATORS OF A VEHICLE WITH A DIESEL WORKING ON DIESEL AND DIESEL GAS CYCLES USING THE MATHEMATICAL MODEL

2020 ◽  
pp. 14-19
Author(s):  
Serhii Kovbasenko ◽  
Andriy Holyk ◽  
Serhii Hutarevych
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
Environmental Performance ◽  
Energy Performance ◽  
Dual Fuel ◽  
Fuel System ◽  
Compressed Natural Gas ◽  
Diesel Vehicles ◽  
Diesel Cycle ◽  
The Mathematical Model

The features of an advanced mathematical model of motion of a truck with a diesel engine operating on the diesel and diesel gas cycles are presented in the article. As a result of calculations using the mathematical model, a decrease in total mass emissions as a result of carbon monoxide emissions is observed due to a decrease in emissions of nitrogen oxides and emissions of soot in the diesel gas cycle compared to the diesel cycle. The mathematical model of a motion of a truck on a city driving cycle according to GOST 20306-90 allows to study the fuel-economic, environmental and energy indicators of a diesel and diesel gas vehicle. The results of the calculations on the mathematical model will make it possible to conclude on the feasibility of converting diesel vehicles to using compressed natural gas. Object of the study – the fuel-economic, environmental and energy performance diesel engine that runs on dual fuel system using CNG. Purpose of the study – study of changes in fuel, economic, environmental and energy performance of vehicles with diesel engines operating on diesel and diesel gas cycles, according to urban driving cycle modes. Method of the study – calculations on a mathematical model and comparison of results with road tests. Bench and road tests, results of calculations on the mathematical model of motion of a truck with diesel, working on diesel and diesel gas cycles, show the improvement of environmental performance of diesel vehicles during the converting to compressed natural gas in operation. Improvement of environmental performance is obtained mainly through the reduction of soot emissions and nitrogen oxides emissions from diesel gas cycle operations compared to diesel cycle operations. The results of the article can be used to further develop dual fuel system using CNG. Keywords: diesel engine, diesel gas engine, CNG

A Mechanism for Self-Starting Thermal Engine

2012 ◽  
Vol 162 ◽  
pp. 29-36
Author(s):  
Nicolae Mircea Dehelean ◽  
Liana Maria Dehelean
Keyword(s):  
Renewable Energy ◽  
Electric Motor ◽  
Special Device ◽  
Otto Cycle ◽  
Working Cycle ◽  
Perpetual Motion ◽  
Diesel Cycle

The conventional engine cannot start alone. The engine needs a special device to turn it on. This device is usually an electric motor that is called starter. Any other engine that uses another working cycle then Otto cycle or Diesel cycle could accede to a self-starting ability. The paper tries to use ancient ideas in order to develop a true thermal engine able to use solar and other renewable energy. This unconventional engine inherits some ideas from the perpetual motion machine solutions.

An Explanation for Observed Compression Ratios in Internal Combustion Engines

1991 ◽  
Vol 113 (4) ◽  
pp. 511-513 ◽  
Author(s):  
S. A. Klein
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Combustion Engines ◽  
Otto Cycle ◽  
Diesel Cycle ◽  
Maximum Work ◽  
The Ideal

Comparisons of the compression ratios, efficiencies, and work of the ideal Otto and Diesel cycles are presented at conditions that yield maximum work per cycle. The compression ratios that maximize the work of the Diesel cycle are found always to be higher than those for the Otto cycle at the same operating conditions, although the thermal efficiencies are nearly identical. The compression ratios that maximize the work of the Otto and Diesel cycles compare well with the compression ratios employed in corresponding production engines.

scholarly journals Some aspects of the use of natural gas motor fuel in diesel locomotives

2020 ◽  
Vol 79 (5) ◽  
pp. 301-309
Author(s):  
E. E. Kossov ◽  
V. V. Asabin ◽  
A. G. Silyuta ◽  
A. N. Zhuravlev ◽  
L. E. Kossova
Keyword(s):  
Natural Gas ◽  
Diesel Fuel ◽  
Structural Changes ◽  
Motor Fuel ◽  
External Source ◽  
Stoichiometric Ratio ◽  
Otto Cycle ◽  
Lower Efficiency ◽  
Air Inlet ◽  
Diesel Cycle

Due to the increase in the cost of diesel fuel, much attention is paid to the use of alternative types of fuel on diesel locomotives. Variants of using fuel obtained from coal, plants, gas fields and hydrogen are considered. Natural gas is the cheapest and most accessible today. The use of specially designed gas-piston engines on diesel locomotives, operating when the gas-air mixture is ignited from an external source, is the most attractive option. However, this approach has certain disadvantages:• it is necessary to create a new engine, since the modernization of existing engines requires serious structural changes;• gas piston engine operates essentially according to the Otto cycle and has lower efficiency and power indicators as compared to a diesel engine;• when modernizing existing diesel locomotives, switching to the Otto cycle excludes the possibility of using diesel fuel.Conversion of diesel locomotives to gas fuel must be carried out using the gas-diesel cycle. This approach is most acceptable for the modernization of diesel locomotives of the existing fleet, since it preserves the thermal performance of the engine and makes it possible to transfer diesel locomotives back to operation on diesel fuel. The main obstacle to the transfer of diesel locomotives to the gas-diesel cycle is the low degree of replacement of diesel fuel with gas. This circumstance is determined by the significant difficulties in ensuring the operation of the engine in the gas-diesel cycle at low loads and idling. It is necessary to ensure a stable supply of ignition fuel in these modes and guaranteed ignition of the gas-air mixture from it. The solution to this problem is ensured by maintaining a given stoichiometric ratio in the gas-air mixture and a temperature sufficient to ignite the ignition portion of the fuel.The main way to regulate the stoichiometric ratio is to reduce the amount of air entering the cylinders by throttling it at the engine inlet. This article discusses the methodology for calculating the performance of the engine when throttling the air inlet.

The Effect of Isolated Air Mass and Fuel/Air Ratio on the Efficiency of Isolated Combustion and Diluted Expansion (ICADE) I. C. Engine Cycle

2008 ◽  
Author(s):  
Hayder Abed Dhahad ◽  
Kamal Ch. Khalil
Keyword(s):  
Internal Combustion Engine ◽  
Compression Ratio ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Otto Cycle ◽  
High Compression Ratio ◽  
Air Mass ◽  
Diesel Cycle ◽  
Unburned Hydrocarbons ◽  
Engine Cycle

The Isolated Combustion and Diluted Expansion (ICADE) internal combustion engine cycle combines the advantages of constant volume combustion of the Otto cycle with the high compression ratio of the Diesel cycle. In this work we studies the effect of Isolated air mass on the efficiency of the cycle, the analysis shown that the decrease of Isolated air mass will increase the efficiency of the cycle, the large dilution air mass will quenches all NOx forming reactions and reduce unburned hydrocarbons. Furthermore, the effect of Fuel / Air ratio on the efficiency studies the analysis shown that the increase of Fuel / Air ratio will increase efficiency of the cycle.

scholarly journals ELECTRICITY GENERATION FROM BIOMASS GASIFICATION

2014 ◽  
Vol 13 (1) ◽  
pp. 28
Author(s):  
A. S. Rumão ◽  
E. F. Jaguaribe ◽  
A. F. Bezerra ◽  
B. L. N. Oliveira ◽  
B. L. C. Queiroga
Keyword(s):  
Electricity Generation ◽  
Biomass Gasification ◽  
Dual Fuel ◽  
Producer Gas ◽  
Power Network ◽  
Otto Cycle ◽  
Cleaning System ◽  
Water Cleaning ◽  
Residue Biomass ◽  
Economic Considerations

Brazil is among the ten largest consumers of electricity in the world, and in the last decades its demand for electricity has been continuously increasing. As a consequence it has not been capable to ensure enough expansion of its electric power network, mostly affecting isolated communities. The present study discusses the use of a system formed by an Indian residue biomass gasifier and a 36 kVA engine-generator, which should generate 20 kWe, using gas-alone mode engine. The engine was, originally, a MWM D229-4 diesel engine, which was converted into an Otto cycle to run only with producer gas. The system performance was evaluated for different engine’s advance ignition angles, and two types of biomass. As the Indian gasifier was designed to operate just with dual-fuel mode to feed a gas-alone engine, some changes in the gasifier's water cleaning system were required. The modifications enabled the system to improve the power generation which overcame the 20 kWe reaching 26 kWe. Technical and economic considerations showed that the bioelectricity based on bio-residual gasifier may be a viable and ecological option for regions having enough biomass residue and not served by the system network.

The Inovar-Auto Program and its Influences on the Dual Fuel Engines Concepts based in Diesel Cycle

2013 ◽  
Author(s):  
Cléliomiro de Sousa Lourenço ◽  
Tiago de Sousa ◽  
André Luiz Pereira
Keyword(s):  
Dual Fuel ◽  
Diesel Cycle ◽  
Dual Fuel Engines

scholarly journals Comparing Carnot, Stirling, Otto, Brayton and Diesel Cycles

2008 ◽  
Vol 42 (2008) ◽  
pp. 1-6 ◽  
Author(s):  
John E. Shaw
Keyword(s):  
Compression Ratio ◽  
Heat Input ◽  
Turning Points ◽  
Temperature Extremes ◽  
Carnot Cycle ◽  
Otto Cycle ◽  
Temperature Ratio ◽  
Fixed Temperature ◽  
Thermodynamic Cycles ◽  
Diesel Cycle

Comparing the efficiencies of the Carnot, Stirling, Otto, Brayton and Diesel cycles can be a frustrating experience for the student. The efficiency of Carnot and Stirling cycles depends only on the ratio of the temperature extremes whereas the efficiency of Otto and Brayton cycles depends only on the compression ratio. The efficiency of a Diesel cycle is generally expressed in terms of the temperatures at the four turning points of the cycle or the volumes at these turning points. How does one actually compare the efficiencies of these thermodynamic cycles? To compare the cycles, an expression for the efficiency of the Diesel cycle will be obtained in terms of the compression ratio and the ratio of the temperature extremes of the cycle. It is found that for a fixed temperature ratio that the efficiency increases with compression ratio for the Otto, Brayton and Diesel cycles until their efficiency is the same as that of the corresponding Carnot cycle. This occurs at the point where the heat input to the cycles is zero. For a fixed compression ratio the efficiency increases with temperature ratio for the Carnot and Stirling cycles but decreases for the Diesel cycle. This is an important factor in understanding how a Diesel cycle can be made to be more efficient than an Otto cycle.

Sign in / Sign up

Export Citation Format

Share Document