Ignition enhancement of lean propane/air mixture by multi-channel discharge plasma under low pressure

Lin, Baiquan; Wu, Yun; Zhang, Zhibo; Bian, Dongliang; Jin, Di

doi:10.1016/j.applthermaleng.2018.12.011

Cited by 23 publications

(5 citation statements)

References 30 publications

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“…In their research, they found that boosting the discharge current improved the ignition stability, and larger plasma volume increased the flame propagating speed for engine combustion. ,, Other studies found that the flame kernel should be large enough to overcome the heat loss of the surroundings and eventually evolve into a self-sustained flame . These observations were also confirmed by Lin et al , In their investigation, a multichannel discharge plasma ignition system was designed, and it was found that successful ignition was achieved only when the ignition kernel propagated over the critical flame radius. Yu et al and Han et al designed a new three-pole igniter for IC engines.…”

Section: Introductionmentioning

confidence: 78%

“…With increasing concerns on fuel consumption and greenhouse gas emission of road vehicles, the concept of lean or diluted combustion has been widely considered as a feasible technical pathway for increasing fuel efficiency and reducing pollution from combustion emissions, especially for internal combustion (IC) engines. − However, when lean or diluted combustion is used (especially when stratified combustion is not utilized), the lean combustible mixture can be hard to ignite or be sustained for satisfactory combustion performance. , Under these scenarios, the high cross-flow speed near the spark plug can further degrade ignition performance due to the higher heat loss under strong flow field conditions. − Besides, the complex in-cylinder thermodynamic environment (such as high background pressure, random temperature, and pressure distribution) increases the uncertainties of the initial flame kernel behavior, which may aggravate the cycle-to-cycle variations of IC engine combustion under lean conditions . Therefore, the ignition characteristics need to be thoroughly investigated to understand and optimize initial flame kernel formation and development.…”

Section: Introductionmentioning

confidence: 99%

“…One of the critical parameters in evaluating the ignition performance is the critical flame radius (Rc), which is defined by Kelley et al and Kim et al and believed to be strongly related to successful ignition. , The critical flame radius quantifies a minimum initial flame radius for successful ignition. In addition, the minimum ignition energy (MIE) for successful flame initiation is proportional to the cube of the critical flame radius. − Essmann et al studied early flame propagations with low discharge energy.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigations on the Optimal Ignition Strategy of Internal Combustion Engines via Various Spark Discharge Conditions

Chang

Sun

et al. 2020

Energy Fuels

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Spark discharge ignition can be effectively enhanced by increasing the plasma volume and its duration, but evaluation and realization of an optimal ignition performance under engine working conditions are big challenges due to the complex in-cylinder flow field and thermodynamic environment. In this investigation, ignition strategies with various spark discharge parameters were tested, and their effects on the initial flame kernel formation and propagation in the early stage of combustion were compared and analyzed in a single-cylinder optical engine. The experimental results indicate that the combustion under stoichiometric conditions is not sensitive to the spark discharge settings; it mainly depends on the fast chemical reaction rate of the combustible mixture and the flow field inside of the cylinder. However, as the mixture becomes leaner, the increased ignition delay makes the ignition difficult gradually. Once the ignition capacity is insufficient, a flame displacement would occur during the flame propagating at the early stage of the combustion; the ignition performance is not fully released. A new spark discharge around the unburned zone can further improve ignition performance. Larger flame displacement means a later combustion phase and worse combustion performance. By boosting the discharge current and duration, the flame displacement and its duration are reduced, and the initial flame kernel formation and propagation can be effectively improved. The fitting results for the flame displacement indicate that each discharge current corresponds to a critical discharge duration; longer discharge duration than the critical discharge can achieve an optimal ignition performance of internal combustion (IC) engines.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigations on the Optimal Ignition Strategy of Internal Combustion Engines via Various Spark Discharge Conditions

Chang

Sun

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The conventional ignition system could be improved by adjusting the spark gap [11], using multi-coil discharge [12], and increasing discharge current [13]. Research in novel ignition systems such as nanosecond repetitive pulse [14], microwave [15], and laser [16] revealed the promising potential for enhancing the ignition, and so does the engine thermal efficiency under lean conditions. However, the hardware complexity and compatibility are the obstacles to applying the common spark ignition (SI) engines.…”

Section: Introductionmentioning

confidence: 99%

Effect of dual-core spark discharge on ignition probability and engine power

Nguyen

Bui

Nguyen

et al. 2022

UD-JST

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This report presents the experimental study of developing a dual-core spark discharge (2C-SD) model for clean combustion. We first studied ignition probability (Pig) of lean methane/air at an equivalence ratio of 0.5 using 2C-SD with different spark-gaps (dgap = 1.0mm and 2.0mm) in a constant volume combustion chamber. We then applied 2C-SD to the engine driving a 2.5-kW generator. The results indicated that Pig is 30% and 45% at dgap=1.0mm and 2.0mm, respectively, while Pig is 0 when using conventional single spark discharge (CSSD). Compared to CSSD, when using 2C-SD the engine power could be improved by 4%-9.7%, depending on the throttle openings. We expect the larger volume of the initial flame kernel by 2C-SD could enhance Pig and quickly reach the critical flame radius before self-sustained propagating. The faster initial flame speed is essential for achieving the optimal combustion phasing, resulting in a higher power.

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“…Plasma has been applied to assist combustion as a new technology [3,4]. Thermal plasma can significantly increase the temperature of the translational gas to increase the reaction rate, and is often used for ignition [5][6][7][8]. The non-equilibrium plasma with higher electron temperature, can generate core intermediate species, free radicals, ions and excited species, which can change the chemical reaction path and accelerate the chemical reaction rate [9,10] and make it possible to maintain stable combustion under extreme conditions.…”

Section: Introductionmentioning

confidence: 99%

Process of Multiple Channel Gliding Arc Assisted Combustion Near Lean Blow-out Limit

et al. 2021

Self Cite

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Multichannel gliding arcs actuators were designed to enhance the non-premixed combustion of the kerosene (RP-3) and air mixture in a swirl combustor near lean blow-out limit. The instantaneous voltage and current of the multichannel gliding arcs and the 1kHz high-speed CH* chemiluminescence imaging of the combustion process were simultaneously measured to show the characteristics of the process assisted by the plasma. When reaching near lean blow-out limit in a flow rate of 225 SLPM, at the combustor inlet, the emission intensity and projected flame assisted by the multichannel gliding arcs remain the same with decreased fuel flow rates from 3 to 1 ml/min, which assisted by the single gliding arc decreases nevertheless. The flame structure under the influence of plasma actuators with various channel numbers evolves differently owing to the differences in plasma distributions.

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Ignition enhancement of lean propane/air mixture by multi-channel discharge plasma under low pressure

Cited by 23 publications

References 30 publications

Investigations on the Optimal Ignition Strategy of Internal Combustion Engines via Various Spark Discharge Conditions

Investigations on the Optimal Ignition Strategy of Internal Combustion Engines via Various Spark Discharge Conditions

Effect of dual-core spark discharge on ignition probability and engine power

Process of Multiple Channel Gliding Arc Assisted Combustion Near Lean Blow-out Limit

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