scholarly journals Indicated Mean Effective Pressure Oscillations in a Natural Gas Combustion Engine

2009 ◽  
Vol 64 (5-6) ◽  
pp. 393-398 ◽  
Author(s):  
Grzegorz Litak ◽  
Michał Gęca ◽  
Bao-Feng Yao ◽  
Guo-Xiu Li
Keyword(s):  
Natural Gas ◽  
Combustion Engine ◽  
Combustion Process ◽  
Spark Ignition Engine ◽  
Effective Pressure ◽  
Gas Combustion ◽  
Indicated Mean Effective Pressure ◽  
Natural Gas Combustion ◽  
Measured Pressure ◽  
Lean Conditions

Fluctuations in a combustion process of natural gas in the internal spark ignition engine have been investigated. We measured pressure of the cyclic combustion and expressed its cyclic oscillations in terms of indicated mean effective pressure per cycle. By applying the statistical and multifractal analysis to the corresponding time series we show the considerable changes in engine dynamics for a different equivalence ratio decreases from 0.781 to very lean conditions.

Numerical Simulation of Natural Gas Combustion Process Using a One-Step and a Two-Step Reaction

2002 ◽  
Author(s):  
Angela O. Nieckele ◽  
Moˆnica F. Naccache ◽  
Marcos S. P. Gomes ◽  
Joa˜o N. E. Carneiro ◽  
Andre´ Augusto Isnard ◽  
...  
Keyword(s):  
Experimental Data ◽  
Natural Gas ◽  
Combustion Process ◽  
Chemical Species ◽  
Reaction Model ◽  
Gas Combustion ◽  
First Case ◽  
Natural Gas Combustion ◽  
Cylindrical Furnace ◽  
Global Reaction

The work evaluates the combustion of natural gas in a cylindrical furnace. The Generalized Finite Rate Reaction Model was selected for predicting the reactions. Two situations were considered. In the first case the combustion of the fuel was predicted by a single global reaction, and in the second case a two-step reaction was considered for predicting the combustion process. The conservation equations of mass, momentum, energy and chemical species were solved by the finite volume procedure, with the commercial software FLUENT. The turbulent flow was modeled by employing the two differential equation κ–ε model. The solutions obtained with the two reaction models, for the temperature and species concentration fields, were compared among them and against experimental data available in the literature. It was observed that the two-step reaction model represents better the physical phenomena, showing a better agreement with the experimental data.

scholarly journals Analysis of combustion process in industrial gas engines powered with high methane and nitrified low-calorific gases

2013 ◽  
Vol 152 (1) ◽  
pp. 42-50
Author(s):  
Jakub ROJEWSKI ◽  
Rafał ŚLEFARSKI ◽  
Jacek WAWRZYNIAK
Keyword(s):  
Natural Gas ◽  
Combustion Process ◽  
Numerical Code ◽  
Numerical Computations ◽  
Gas Combustion ◽  
Elementary Reactions ◽  
Natural Gas Transmission ◽  
Gas Fuel ◽  
Natural Gas Combustion

The paper presents the results of an investigation of gas engines used in the Polish system of natural gas transmission. The investigation concerned both four-stroke and two-stroke engines. The engines were fed with two kinds of gas fuel – low-calorific natural gas containing 54.5 % of methane, and with high-methane (up to 95 %) natural gas. Combustion in both types of engines with different methods of mixture supply into the cylinder was analysed for different parameters. The paper also presents numerical computations of basic physical values characterizing combustion of gas fuels in engines. The computations were made with Cantera numerical code based on the mechanism of elementary reactions occurring while burning methane GRI 3.0 for various molar fractions of methane in the gas fuel.

scholarly journals CFD-3D Analysis of a Light Duty Dual Fuel (Diesel/Natural Gas) Combustion Engine

2014 ◽  
Vol 45 ◽  
pp. 929-937 ◽  
Author(s):  
Enrico Mattarelli ◽  
Carlo Alberto Rinaldini ◽  
Valeri I. Golovitchev
Keyword(s):  
Natural Gas ◽  
Combustion Engine ◽  
Dual Fuel ◽  
3D Analysis ◽  
Gas Combustion ◽  
Light Duty ◽  
Natural Gas Combustion

scholarly journals Effects of CNG quantity on combustion characteristics and emissions of a dual fuelled automotive diesel engine

2020 ◽  
Vol 180 ◽  
pp. 01008
Author(s):  
Silviu Rotaru ◽  
Constantin Pana ◽  
Nicolae Negurescu ◽  
Alexandru Cernat ◽  
Dinu Fuiorescu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Natural Gas ◽  
Combustion Process ◽  
Operating Regime ◽  
Intake Manifold ◽  
Maximum Pressure ◽  
Effective Pressure ◽  
Compressed Natural Gas ◽  
Positive Effects ◽  
Indicated Mean Effective Pressure

The paper reveals some experimental aspects of compressed natural gas (CNG) use in dual fuel mode at an automotive diesel engine. Brake specific energetic consumption, incylinder pressure, emissions and variability of indicated mean effective pressure are analysed at operating regime of 2000 rpm and 40% load. Using CNG as an alternative fuel reduces brake specific energetic consumption by 50%, the CO2 emission by 10% and sets the in-cylinder maximum pressure 13 bar higher comparative to diesel fuel fuelling. The smoke and hydrocarbons emissions and the variability of indicated mean effective pressure are affected by the injection of compressed natural gas into intake manifold: HC emission grows 24 times, the smoke number and the coefficient of variability of IMEP double their values. The use of compressed natural gas at an automotive diesel engine improves its energetic performances and combustion process, having positive effects on CO2 emission and fuel consumption.

scholarly journals Combustion and Emission Characteristics of a Biodiesel-Hydrogen Dual-Fuel Engine

2020 ◽  
Vol 10 (3) ◽  
pp. 1082 ◽  
Author(s):  
Wojciech Tutak ◽  
Karol Grab-Rogaliński ◽  
Arkadiusz Jamrozik
Keyword(s):  
Combustion Engine ◽  
Combustion Process ◽  
Combustion Stability ◽  
Dual Fuel ◽  
Diffusion Combustion ◽  
Hydrogen Energy ◽  
Effective Pressure ◽  
Indicated Mean Effective Pressure ◽  
Soot Emissions ◽  
Energy Share

The paper presents the results of co-combustion of biodiesel with hydrogen in a compression-ignition internal combustion engine. The tests were carried out on a stationary engine with constant settings. The paper presents the results of the assessment of the combustion process, combustion stability and exhaust emissions in a dual-fuel diesel engine fueled with biodiesel and hydrogen. It was found that it is possible to replace biodiesel with hydrogen to its energetic share of 38%. The share of hydrogen in the co-combustion process causes a change in combustion phases and reducing the duration of combustion. The increase of the engine thermal efficiency was obtained with the increase of the H2 share. A different character of heat release rate was obtained compared to a conventional engine. The reduction in the diffusion combustion phase has contributed to a significant reduction in soot emissions. The maximum 38% of hydrogen energy share acceptable by the engine, resulted in a more than 25-times reduction in soot emissions. The combustion stability assessed on the basis of the unrepeatability of the indicated mean effective pressure (COVIMEP) index and also on the basis of the indicated mean effective pressure (IMEP) normal distribution was also analyzed.

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