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doi:10.3850/978-981-08-7724-8_10-04
The Role of Ignition Delay Time on the Deflagration Index in a 20l Bomb
A. Garcia Agreda1,2, A. Di Benedetto2, P. Russo3,a, E. Salzano2 and R. Sanchirico2
1Dipartimento di Ingegneria Chimica, Università di Napoli Federico II, P.le Tecchio 80, 80125, Napoli
2Istituto di Ricerche sulla Combustione - CNR, Via Diocleziano 328, 80124 Napoli
3Dipartimento di Ingegneria Chimica e Alimentare, Università di Salerno, via Ponte don Melillo, 84084 Fisciano, SA.
aparusso@unisa.it
ABSTRACT
Deflagration index measurements have been performed in a 20 l sphere for methane/air and methane/nicotinic acid/air mixtures of different compositions at varying ignition delay time and, hence, turbulence level. The severity of explosion increases when nicotinic acid is present; this effect is more pronounced with increasing turbulence level. The effect of the initial level of turbulence on the deflagration index values was then modelled through equations for the turbulent burning velocity as a function of velocity fluctuation. The model reproduces the experimental data well, provided that an adequate equation for the turbulent burning velocity is used.
Keywords: Deflagration index, Turbulence, Hybrid mixture.
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