摘要
为了提高天然气燃烧速度,促进火焰传播,提高火焰稳定性,研究了稀燃条件下电场对层流预混火焰的影响。进行了常温、常压下的定容燃烧弹试验,分析了负电场和高频交流电场对天然气/空气预混稀燃火焰形状、燃烧压力、压力升高率、火焰燃烧期的影响。结果表明:过量空气系数1.6下,加载交直流电场均使火焰发生形变;当加载直流-5 kV电场与有效值为5 kV频率5、10、15和25 k Hz交流电场时,燃烧压力峰值分别增大6.96%、8.84%、10.50%、13.78%、14.40%,峰值到达时间提前14.67%、13.58%、18.93%、25.41%、27.97%;加载交直流电场,主要使火焰初始燃烧期缩短。交直流电场对火焰均有促进作用,且高频交流电场对火焰的促进作用优于直流电场。
The effects of electric fields on the natural gas laminar premixed flame were investigated under lean combustion condition to promote the flame propagation and improve the flame combustion speed and stability. Experiments were conducted in a constant volume combustion bomb under the room temperature and atmospheric pressure conditions to analyze the effects of DC and AC electric fields on the flame shape, combustion pressure, the pressure rise rate, and flame combustion duration. The results show that the peak combustion pressure increased by 6.96%, 8.84%, 10.50%, 13.78%, and 14.40% and peak pressure arrival time were shortened by 14.67%, 13.58%, 18.93%, 25.41%, and 27.97% when the DC electric fields of-5 kV and AC electric fields with the voltage virtual value of-5 kV and frequencies of 5, 10, 15, and 25 k Hz were applied at the excess air ratio of 1.6, the flame was stretched with the applied voltage. Initial duration was shortened significantly with the applied voltage. Therefore, AC and DC electric field have a promoting effect on the flame, and the high frequency AC electric fields for the promotion of flame are better than that of DC electric fields. These results will be helpful to the theory research of alternative fuel vehicles engine combustion process.
出处
《汽车安全与节能学报》
CAS
CSCD
2016年第1期72-77,共6页
Journal of Automotive Safety and Energy
基金
国家自然科学基金资助项目(51176150
51476126)
汽车安全与节能国家重点实验室开放基金资助项目(KF14122)
关键词
替代燃料汽车
天然气
稀燃
燃烧压力
火焰燃烧期
负电场
高频交流电场
alternative fuel vehicles
natural gas
lean combustion
combustion pressure
flame combustion duration
negative DC electric fields
high-frequency AC electric fields
