Heat and mass transfer at the ignition of vapors of volatile liquid fuels by hot metal core: Experimental study and modelling

Measurements are reported on the main factors and mechanisms of heat and mass transfer controlling the ignition of mixtures of fuel vapors (gasoline Super 95) and oxidant (air) by a metal core (heated at temperatures higher than 1300 K) taking advantage of using cross-correlation recording and measuring system including optical method of tracer visualization. The ignition delay time was measured for different core temperatures and gas gap between heat source and liquid fuel surface which evaporates at moderate temperatures (about 300 K). A physical model of the process was formulated and predictive mathematical model elaborated on the basis of experimental results. A good agreement between numerical and experimental results is obtained. The modes of air-vapor mixtures ignition for liquid fuels by local heating are established from the developed mathematical model of heat and mass transfer.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Experimental and numerical study of heat transfer and oxidation reaction during ignition of diesel fuel by a hot particle

This study is focused on the heat and mass transfer in the complex process of ignition of diesel fuel by a local heat source. The main macroscopic rules governing the ignition of liquid fuel by small steel and ceramic particles heated from 1200 K to 1500 K are established and reported. The investigated parameters are the ignition time delay for different igniters i.e. with different sizes, temperatures, porosities and thermophysical properties. Physical and mathematical models are elaborated. The experimental results are used to describe the interactions between the local heat source and the liquid fuel. Numerical simulations of heat transfer processes are carried out taking into account the vaporization and the heat production by the oxidation reaction. The border line defining the limit of the stable ignition domain is determined for diesel fuel. Possible modes and mechanisms of ignition under laboratory conditions are established.SCOPUS: ar.jinfo:eu-repo/semantics/publishe