Experimental study of flame stability enhancement on lean premixed combustion of a synthetic natural gas in Thailand

Kaewpradap, Amornrat; Jugjai, Sumrerng

doi:10.1016/j.energy.2019.116029

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…It is greater than 0.01, indicating that CO2 has a stronger inhibitory effect on combustion than N2, the combustion rate decreases more, the complexity of the phase space trajectory is increased, and the unpredictability of the combustion process is enhanced. When the CO2 content is 20%, the correlation dimension increases significantly, reaching 1.88, indicating that when the shale gas contains 20% CO2, the difficulty of flame propagation has increased significantly, the burning rate has decreased significantly, the unpredictability of the phase space trajectory has increased, and the combustion stability has decreased significantly [45][46]. It can be seen from the figure that when the engine is operating at the maximum torque, the maximum Lyapunov index is 0.067 when the CH4 content is 85%.…”

Section: Chaotic Characteristics Of the Combustion Processmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

Liu

Zhang

Zhong

et al. 2021

Preprint

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The traditional analysis method of engine combustion cycle variation is a statistical method based on a small amount of data. In essence, the obtained cycle variation is random data. In order to reveal the dynamic nature of the cyclical changes during the combustion of a shale gas engine, a nonlinear dynamics method was used to study the stability of the combustion process. The motion law of the phase space trajectory is analyzed, the influence of the shale gas composition on the trajectory distribution is analyzed, the return mapping point of the average indicated pressure in the cylinder is discussed. The relationship between adjacent combustion characteristic parameters is studied; the chaotic characteristics of the shale gas engine combustion process are discussed. The results show that during the working process of the shale gas engine, the in-cylinder pressure shows a similar quasi-periodic state in the entire phase space, and the working process has a certain chaotic law; with the increase of the CH4, N2 and CO2 content in the shale gas, the combustion cycle variation increases, and the randomness of the engine working process increases. The phase space trajectory shows a monotonously increasing distribution of Poincaré mapping points on the ∑XY+ section. With the increase of the combustion cycle, the linear relationship of the scattered points gradually increases, and the randomness of the combustion process increases. The return map points of the engine combustion characteristic parameters are distributed in a cluster. When the CH4 content increases, the distribution range of the average indicated pressure return map points increases. With the increase of N2 and CO2 content, abnormal combustion phenomena such as partial combustion or misfire occur during the engine combustion process, the uncertainty of the combustion process increases, and the combustion stability decreases. With the increase of engine speed, the correlation dimension and the maximum Lyapunov exponent increase, the randomness of the combustion process increases, and the chaotic characteristics of the engine working process are obvious; the time series of the cylinder pressure is more sensitive to the content of inert gas. With the increase of N2 and CO2 content in the gas, the correlation dimension and the maximum Lyapunov exponent increase significantly, the complexity of the phase space trajectory increases, and the chaotic characteristics become more obvious.

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Section: Chaotic Characteristics Of the Combustion Processmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

Liu

Zhang

Zhong

et al. 2021

Preprint

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“…In 2019, Kaewpradap et al conducted an experimental study on two types of natural gas in Thailand, increasing flame stability in line with previous works and using a McKenna flat burner and a porous ceramic burner. Eastern natural gas combustion with the McKenna flat burner has a more stable flame with a smaller cell size and a wider cell flame ignition limit than Western natural gas 11 . The porous ceramic burner should have a more stable flame without flashback, which should be increased to the equivalence ratio of 0.75 11 .…”

Section: Introductionmentioning

confidence: 99%

“…Eastern natural gas combustion with the McKenna flat burner has a more stable flame with a smaller cell size and a wider cell flame ignition limit than Western natural gas 11 . The porous ceramic burner should have a more stable flame without flashback, which should be increased to the equivalence ratio of 0.75 11 .…”

Section: Introductionmentioning

confidence: 99%

Stability study of flame structure using photodiodes in surface flame burners

Jazayeri,

Targhi,

Karafi

2024

Sci Rep

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Radiation spectroscopy can be effective in identifying pollutants and species. By examining a photodiode, the frequency peaks obtained from the analysis, and the range in which the cell flame is converted to a surface flame, we obtained the value ratio of the cell flame to the surface flame in the range of 0.7–0.74 in different powers. The frequency peak in this range decreases from the maximum value of 9.9823 Hz to its minimum value of 9.058 Hz in different powers. By analyzing the temperature compared to the frequency peak, we found that in the range of equivalence ratio 0.7–0.75, the frequency peak decreases from 9.5 to 9.9 Hz to 8.7–9 Hz. The temperature has an increasing behavior, and in the equivalence ratio, the temperature is in the range of 1400–1500 °C, i.e., at its maximum value. We observed the cell formation process and its conversion to surface flame by flame detection. The flame height in the cellular and superficial regions is in the range of 0.65–0.85, which is the minimum flame height of 3–10 mm, and NO and CO were examined in the ratio of different equations and compared with temperature. In the ratio equivalence ratio of 0.77–0.81 in the temperature range of 1500 °C (maximum), the value of NO is about 16 ppm (maximum), and the value of CO is about 2 ppm (minimum). That is, when the temperature is at its maximum, it becomes CO minimum and NO maximum. This can be used for different applications such as similar and industrial burners.

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