Effect of ignition energy on the uncertainty in the determination of laminar flame speed using outwardly propagating spherical flames

Zhou, Mengni; Li, Gesheng; Liang, Junjie; Ding, Haiqi; Zhang, Zunhua

doi:10.1016/j.proci.2018.07.084

Cited by 26 publications

(5 citation statements)

References 22 publications

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“…Possible solutions could be lean or diluted mixtures [1,53] as well as pre-chamber spark plugs [63,64], which increase the efficiency of internal combustion engines. The three options mentioned are increasing the stress on the spark plug in terms of inflammation probability and wear [9,11,69].…”

Section: Introductionmentioning

confidence: 99%

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

Michler

Toedter

Koch

2020

Automot. Engine Technol.

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In this work, the temporal and spatial rotational temperature, as an indicator of spark temperature in the gas, of an ignition spark at ambient pressure is determined. With optical emission spectroscopy, the rotational bands of the nitrogen C 3 Π u → B 3 Π g transition at a wavelength of 337 nm are for determination. In addition, the electrical values of the current and the voltage are measured with a digital storage oscilloscope. All measurements are performed with a common nickel spark plug and a commercial 90 mJ ignition coil. The dwell time of the coil is varied in four steps from 100 to 25% and the influence on the rotational temperature is measured. The results are split into the three spark phases: breakdown, arc discharge, and glow discharge. The results show a cold breakdown, which is independent from the dwell time. On average, arc discharge is the hottest discharge phase, while the glow discharge has a medium rotational temperature.

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Section: Introductionmentioning

confidence: 99%

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

Michler

Toedter

Koch

2020

Automot. Engine Technol.

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“…In addition, Lawes et al [17] found that the low Eig induces a non-spherically propagating flame, while the high Eig could initiate a more stable spherical flame kernel. Recently, Zhou et al [18] found that (dR/dt)min particularly increases with a specific range of Eig; beyond this range (dR/dt)min is virtually independent of additional increasing Eig. Unfortunately, these studies mainly focused on the flame speed rather than tdelay.…”

Section: Introductionmentioning

confidence: 98%

A study on the influence of ignition energy on ignition delay time and laminar burning velocity of lean methane/air mixture in a constant volume combustion chamber

Nguyen¹

2021

UD-JST

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This study presents the effect of ignition energy (Eig) on ignition delay time (tdelay) and uncertainty of laminar burning velocity (Su0) measurement of lean methane/air mixture in a constant volume combustion chamber. The mixture at an equivalence ratio of 0.6 is ignited using a pair of electrodes at the 2-mm spark gap. Eig is measured by integrating the product of voltage V(t) and current I(t) signals during a discharge period. The in-chamber pressure profiles are analyzed using the pressure-rise method to obtain tdelay and Su0. Su0 approximates 8.0 cm/s. Furthermore, the increasing Eig could shorten tdelay, leading to a faster combustion process. However, when Eig is greater than a critical value, called minimum reliable ignition energy (MRIE), the additional elevating Eig has the marginal effect on tdelay and Su0. The existence of MRIE supports to optimize the ignition systems and partly explains why extreme-high Eig>> MRIE has less contribution to engine performance.

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“…This is because the larger E ig , the higher concentration of active radicals inside the spark gap [31] and/or the higher chemical power release [32]. Moreover, for laminar CH 4 /O 2 /N 2 /He spherical flames, Zhou et al [33] found that the increasing E ig in a specific range could promote the early flame propagation speed; beyond such range, the additional E ig has a marginal effect on the early flame propagation speed, as it does for the explosion duration. To the best of the authors' knowledge, experimental studies on the explosion duration characteristics of such lean hydrogen-methane flames over a wide range of hydrogen fraction and ignition energy are sparse.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ignition Energy and Hydrogen Addition on Laminar Flame Speed, Ignition Delay Time, and Flame Rising Time of Lean Methane/Air Mixtures

et al. 2022

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A series of experiments were performed to investigate the effect of ignition energy (Eig) and hydrogen addition on the laminar burning velocity (Su0), ignition delay time (tdelay), and flame rising time (trising) of lean methane−air mixtures. The mixtures at three different equivalence ratios (ϕ) of 0.6, 0.7, and 0.8 with varying hydrogen volume fractions from 0 to 50% were centrally ignited in a constant volume combustion chamber by a pair of pin-to-pin electrodes at a spark gap of 2.0 mm. In situ ignition energy (Eig ∼2.4 mJ ÷ 58 mJ) was calculated by integration of the product of current and voltage between positive and negative electrodes. The result revealed that the Su0 value increases non-linearly with increasing hydrogen fraction at three equivalence ratios of 0.6, 0.7, and 0.8, by which the increasing slope of Su0 changes from gradual to drastic when the hydrogen fraction is greater than 20%. tdelay and trising decrease quickly with increasing hydrogen fraction; however, trising drops faster than tdelay at ϕ = 0.6 and 0.7, and the reverse is true at ϕ = 0.8. Furthermore, tdelay transition is observed when Eig > Eig,critical, by which tdelay drastically drops in the pre-transition and gradually decreases in the post-transition. These results may be relevant to spark ignition engines operated under lean-burn conditions.

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Effect of ignition energy on the uncertainty in the determination of laminar flame speed using outwardly propagating spherical flames

Cited by 26 publications

References 22 publications

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

Measurement of temporal and spatial resolved rotational temperature in ignition sparks at atmospheric pressure

A study on the influence of ignition energy on ignition delay time and laminar burning velocity of lean methane/air mixture in a constant volume combustion chamber

Effect of Ignition Energy and Hydrogen Addition on Laminar Flame Speed, Ignition Delay Time, and Flame Rising Time of Lean Methane/Air Mixtures

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