Quantitative evaluation of the breakdown process of spark discharge for spark-ignition engines
Quantitative evaluation of the breakdown process of spark discharge for spark-ignition engines
复制标题
火花点火式发动机火花放电击穿过程的定量评价
DOI：
10.1088/1361-6463/ab56da
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发表时间：
2019-11
期刊：
影响因子：
--
通讯作者：
Ren Chen
中科院分区：
文献类型：
--
作者：
Shuai Huang;Tie Li;Pengfei Ma;Siyu Xie;Zhifei Zhang;Ren Chen
对于火花点火（SI）发动机，小型化、废气再循环和稀薄燃烧是满足更严格的排放法规和降低燃料消耗要求的有前途的方法。随着这些技术的发展，火花塞周围在点火时刻的高密度和高流速对稳定点火带来了严峻的挑战。高密度条件下的点火过程受击穿相和重击的影响。击穿相位的定量评价对高功率密度发动机尤为重要。在本研究中，建立了压力高达40 bar，温度高达450 K的实验，以评估不同火花塞间隙下的击穿电压和电流。击穿电压与环境密度、火花塞间隙距离和气体成分有关。线圈参数对击穿电压影响不大。击穿电流与击穿电压呈正相关，并受线圈特性的影响。击穿电压和击穿电流与压力和间隙距离呈非线性相关。随着压力或间隙距离的增大，击穿电压和击穿电流的增幅减小。当燃料浓度适用于发动机工作时，燃料浓度和种类对击穿电压的影响较小。最后，建立了击穿电压随环境压力、温度和火花塞间隙距离的函数表达式。新开发的表达式对于模拟大范围环境密度下的SI发动机火花点火过程具有重要价值。
For spark-ignition (SI) engines, downsizing, exhaust gas recirculation and lean burn are promising methods for meeting more stringent emission regulations and lower fuel consumption requirements. With these technologies, high density and high flow velocity around the spark plug at spark timing bring severe challenges for stable ignition. The ignition processes could be affected by breakdown phases and restrikes under high-density conditions. A quantitative evaluation for the breakdown phase is of great significance especially for high power density engines. In this study, the experiments with pressure up to 40 bar and temperature up to 450 K are established to evaluate the breakdown voltage and current, with different spark plug gaps. The breakdown voltage is related to the ambient density, spark plug gap distance and gas composition. The coil parameters have little effects on the breakdown voltage. The breakdown current shows positive correlation with the breakdown voltage, and is also affected by the coil characteristics. The breakdown voltage and current show the nonlinear correlations with the pressure and gap distance. With the increase of pressure or gap distance, the increase rates of the breakdown voltage and current decrease. The fuel concentration and species have little effects on the breakdown voltage when the fuel concentration is applicable for engine operations. Finally, a novel expression of the breakdown voltage is constructed as a function of ambient pressure, temperature and spark plug gap distance. The newly developed expression is valuable for simulating spark ignition processes for a wide range of ambient density for SI engines.
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DOI：
10.1088/0022-3727/45/25/255201
发表时间：
2012-06
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
C. Oliveira;J. L. Reis;J. A. Souza-Corrêa;A. Dal Pino;J. Amorim
通讯作者：
C. Oliveira;J. L. Reis;J. A. Souza-Corrêa;A. Dal Pino;J. Amorim
DOI：
10.1088/0022-3727/35/10/201
发表时间：
2002-05
期刊：
Journal of Physics D
影响因子：
--
作者：
M. Pejovic;G. Ristić;J. Karamarković
通讯作者：
M. Pejovic;G. Ristić;J. Karamarković
影响因子：
10.4
作者：
Tie Li;Dawei Wu;Min Xu
通讯作者：
Tie Li;Dawei Wu;Min Xu
影响因子：
--
作者：
BOYLE, WS;KISLIUK, P
通讯作者：
KISLIUK, P
影响因子：
10.4
作者：
Li, Tie;Zheng, Bin;Yin, Tao
通讯作者：
Yin, Tao