Numerical simulation of gel fuel gas-phase ignition by a local source of limited heat content

Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

“…The parameters corresponding to References [23,29] carried out with typical and most promising gel fuels were used as the initial data in the numerical simulation (Table 1).…”

“…Time-averaged thermophysical characteristics of a gel fuel sample (50 vol% oil; 48 vol% aqueous solution of PVA (10 wt.%); 2 vol.% emulsifier) are presented in Table 1 [23]. In the simulation, the symmetric configuration of the fuel sample was considered.…”

“…The gel-forming layer formation stage is three times longer than the bubble formation and layer rupture stage [22]. In [23], a mathematical model of hydrazine-based gel fuel ignition under conductive heating by a hot metal particle of a cylindrical shape is presented. It was found that gel fuel ignition delay times during conductive heating vary in the range of 0.02-0.8 s. To ignite a droplet of gel fuel, a critical heat flux density of 60-950 kW/m 2 is required.…”

“…It was found that gel fuel ignition delay times during conductive heating vary in the range of 0.02-0.8 s. To ignite a droplet of gel fuel, a critical heat flux density of 60-950 kW/m 2 is required. This density varies depending on the dimensions (radius range: 2.5-10 mm, height range: 5-20 mm) and the initial temperature of the metal cylinder (840-1500 K) [23]. In [24], a model of ignition of a typical particle of a gel fuel based on an organic polymer thickener in a high-temperature air environment is presented.…”