Full Text:   <622>

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CLC number: TK413.9

On-line Access: 2015-10-01

Received: 2015-03-02

Revision Accepted: 2015-06-17

Crosschecked: 2015-09-15

Cited: 0

Clicked: 1167

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Cang-su Xu

http://orcid.org/0000-0003-4941-8312

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.10 P.830-838

10.1631/jzus.A1500039


Characterization of gasoline combustion with laser and spark ignition


Author(s):  Cang-su Xu, Dong-hua Fang, Qi-yuan Luo, Jian Ma, Yang Xie, Xu Zheng

Affiliation(s):  College of Energy Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   xucangsu@zju.edu.cn

Key Words:  Laser ignition, Spark ignition, Pressure rise rate, Peak pressure, Heat release rate


Cang-su Xu, Dong-hua Fang, Qi-yuan Luo, Jian Ma, Yang Xie, Xu Zheng. Characterization of gasoline combustion with laser and spark ignition[J]. Journal of Zhejiang University Science A, 2015, 16(6): 830-838.

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author="Cang-su Xu, Dong-hua Fang, Qi-yuan Luo, Jian Ma, Yang Xie, Xu Zheng",
journal="Journal of Zhejiang University Science A",
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pages="830-838",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1500039"
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Abstract: 
The combustion of gasoline-air mixtures in a constant-volume combustion chamber with an initial condition of 0.1 MPa pressure and 363 K temperature is experimentally investigated with laser ignition generated by a Q-switched Nd:YAG laser (wavelengths of 532 and 1064 nm). spark ignition is also tested, and the results are used as the benchmark. Combustion chamber pressure is measured by a piezoelectric pressure transducer, and recorded using a digital oscilloscope. When the equivalence ratio is swept from 1.2 to 1.8, laser and spark ignition show marginal differences in pressure rise rate and peak pressure. The maximum pressure rise rate and the maximum peak pressure are obtained at equivalence ratios of 1.6 and 1.8 for laser ignition and spark ignition, which are 39.4 MPa/μs and 0.68 MPa for the laser wavelength of 532 nm, 38.8 MPa/μs and 0.67 MPa for the laser wavelength of 1064 nm, and 38.1 MPa/μs and 0.67 MPa for spark ignition, respectively. When the equivalence ratio is reduced below 1.2, the pressure rise rate and peak pressure of the laser ignition are significantly higher than those of spark ignition, and the lean limit for laser ignition is also wider than that of spark ignition; therefore, laser ignition is more favorable for lean combustion. For both the laser and spark ignitions, the ignition energy demonstrated a limited impact on both the pressure rise rate and peak pressure. heat release rate in the combustion chamber is calculated, and the results show that variations of heat release are in accordance with variations of the pressure history.

The paper is fairly novel as there are only few papers that have carried out the availability of using laser-induced spark ignition with liquid fuel.The paper is interesting and helps the understanding of the performance of gasoline combustions with laser induced ignition.

汽油激光诱导火花点火与电火花点火燃烧过程对比研究

目的:激光诱导火花点火(简称激光点火)是取代传统的靠近缸壁的单点电火花点火以实现稀薄燃烧、提高热效率和改善排放的新型点火方式之一。本文通过对比分析两种点火方式在定容弹中的点火及燃烧过程的压力上升率、最大爆发压力及放热率为激光点火技术在内燃机中的应用提供设计过程的参考依据。
创新点:1. 同时进行两种点火方式的试验,保证对比研究的准确性;2. 激光点火采用532 nm和1064 nm波长的两种激光进行对比;3. 直接采用汽油进行研究。
方法:通过记录不同当量比的汽油空气混合气在定容燃烧弹内激光点火(532 nm和1064 nm波长)及电火花点火的燃烧过程压力变化:1. 对比分析三种点火情况的压力上升率和最大爆发压力;2. 通过公式计算,对比分析三种点火情况的放热率。
结论:1. 532 nm与1064 nm波长激光点火的压力上升率和最大爆发压力都在当量比为1.8时出现最大值,其中532 nm波长激光为39.4 MPa/μs和0.68 MPa,1064 nm波长激光为38.8 MPa/μs和0.67 MPa;而电火花点火的压力上升率和最大爆发压力则在当量比为1.6时出现最大值,分别为38.1 MPa/μs和0.67 MPa;2. 激光点火的稀燃极限相对电火花点火对应的当量比更小;3. 三种点火类型的放热率规律与压力上升率变化规律一致。

关键词:激光点火;电火花点火;压力上升率;最大爆发压力;放热率

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