Laser ignition of iso-octane air aerosols

被引：15

作者：

Lawes, M. ^{[1
]}

Lee, Y. ^{[1
]}

Mokhtar, A. S. ^{[2
]}

Woolley, R. ^{[1
]}

机构：

[1] Univ Leeds, Sch Mech Engn, Leeds, W Yorkshire, England

[2] Univ Putra Malaysia, Dept Aerosp Engn, Fac Engn, Selangor, Malaysia

来源：

COMBUSTION SCIENCE AND TECHNOLOGY | 2008年 / 180卷 / 02期

关键词：

aerosols; cloud chamber; droplets; laser ignition; premixed combustion;

D O I：

10.1080/00102200701739198

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Iso-octane aerosols in air have been ignited with a focused Nd:YAG laser at pressures and temperatures of 100kPa and 270K and imaged using schlieren photography. The aerosol was generated using the Wilson cloud chamber technique. The droplet diameter, gas phase equivalence ratio and droplet number density were determined. The input laser energy and overall equivalence ratio were varied. For 270mJ pulse energies initial breakdown occurred at a number of sites along the laser beam axis. From measurements of the shock wave velocity it was found that energy was not deposited into the sites evenly. At pulse energies of 32mJ a single ignition site was observed. Overall fuel lean flames were observed to locally extinguish, however both stoichiometric and fuel rich flames were ignited. The minimum ignition energy was found to depend on the likelihood of a droplet existing at the focus of the laser beam.

引用

页码：296 / 313

页数：18

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