The Early Phase of Spark Ignition
| Autor: | R. M. Clements, D. R. Topham, P. L. Pitt |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Chemistry
Turbulence General Chemical Engineering General Physics and Astronomy Energy Engineering and Power Technology Laminar flow General Chemistry Mechanics Vorticity Vortex ring law.invention Physics::Fluid Dynamics Ignition system Fuel Technology Classical mechanics Physics::Plasma Physics law Spark (mathematics) Axial symmetry Mixing (physics) |
| Zdroj: | Combustion Science and Technology. 78:289-314 |
| ISSN: | 1563-521X 0010-2202 |
| DOI: | 10.1080/00102209108951753 |
| Popis: | Experimental evidence relating to the early phase of the spark ignition process is reviewed. This suggests that the evolution of the spark kernel after the initial shockwave formation is governed by well defined fluid mechanical structures. In the case of an axial spark this takes the form of a toroidal vortex pair which, depending on the discharge conditions, can be either a laminar or turbulent structure, with a rapid transitions between the two states. Plasma jet and surface discharge igniters on the other hand produce an axially propagating spherical turbulent kernel. It is proposed that igniters can be classifed into two major groups on the basis of their underlying fluid mechanical structures, either radially or axially propagating mixing elements. A mathematical model of the turbulent toroidal mixing element is developed and compared with some of the available experimental data on kernel growth rates. The consequences of the internal vorticity of the kernels for ignition in turbulent mixtu... |
| Databáze: | OpenAIRE |
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