The physical processes induced by a very fast spark discharge in quiescent propane/air mixtures have been observed by 2-D laser shadowgraphy and 1-D Rayleigh Laser light Scattering techniques. The temporal evolution and spatial distribution of the heated gases, previously described by a model, are presented and linked to the shape transition of the shock wave fronts. The build-up and the evolution of an associated flow field has been followed, evidencing the morphological transition of the excited gas pocket, leading to toroidal flame fronts. The different behaviours of inert and reactive mixtures have allowed us to attribute the radial enlargement of the excitation to the fast spark and the isotropic expansion to the chemistry. Preliminary investigations were carried out in order to exploit the turbulent flow field induced by the fast spark.
Enhancing Ignition by Conditioning the Fast-Spark Induced Flow Field
Borghese A;Moccia V;
1990
Abstract
The physical processes induced by a very fast spark discharge in quiescent propane/air mixtures have been observed by 2-D laser shadowgraphy and 1-D Rayleigh Laser light Scattering techniques. The temporal evolution and spatial distribution of the heated gases, previously described by a model, are presented and linked to the shape transition of the shock wave fronts. The build-up and the evolution of an associated flow field has been followed, evidencing the morphological transition of the excited gas pocket, leading to toroidal flame fronts. The different behaviours of inert and reactive mixtures have allowed us to attribute the radial enlargement of the excitation to the fast spark and the isotropic expansion to the chemistry. Preliminary investigations were carried out in order to exploit the turbulent flow field induced by the fast spark.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
