Flame Spread Along PE-Insulated Wire in Sub-Atmospheric Pressure Enclosure

Nakamura, Yuji; Yoshimura, Nobuko; Matsumura, Tomohiro; Ito, Hiroyuki; Fujita, Osamu

doi:10.1115/ht2007-32657

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The propagation of the flame through the wire with polymer insulation at a reduced (below atmospheric) pressure was investigated experimentally in [4] in order to assess the fire safety of the electrical circuit in the aircraft, as well as space environments. As a combustion sample, NiCr wire with polyethylene (PE) insulation is used.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the thermal-physical characteristics of a coke foam layer in the fire protection of cable articles with foaming coating

Tsapko

Likhnyovskyi²,

Tsapko

et al. 2023

EEJET

View full text Add to dashboard Cite

An issue related to using cable products for building structures is to ensure their stability and durability when operating within wide limits. Therefore, the object of research was a change in the properties of the polymer sheath of the cable during the formation of a swollen coating layer under the influence of high temperature. It is proved that in the process of thermal action on the flame retardant coating, the process of thermal insulation of the cable involves the formation of particulate products on the surface of the sample. Under the action of the burner flame, a temperature was reached on the surface of the sample, which led to a swelling of the coating of more than 16 mm. The measured temperature on the inverse surface of the sample was no more than 160 °C, which indicates the formation of a barrier for temperature. In this regard, a calculation and experimental method for determining thermal conductivity when using a flame retardant as a coating has been developed, which makes it possible to estimate the coefficients of temperature conductivity and thermal conductivity under high-temperature action. According to the experimental data and established dependences, the coefficients of temperature conductivity and thermal conductivity of wood were calculated, which are 214.4·10–6 m2/s and 0.62 W/(m∙K), respectively, due to the formation of a heat-insulating swollen layer. The maximum possible temperature penetration through the thickness of the coating was assessed. A temperature was created on the surface of the sample, which significantly exceeds the ignition temperature of the polymer sheath of the cable, and, on a non-heated surface, does not exceed 160 °C. Thus, there is reason to argue about the possibility of directed adjustment of the fire protection processes of an electrical cable by using coatings capable of forming a protective layer on the surface of the material, which inhibits the rate of heat transfer.

show abstract

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the thermal-physical characteristics of a coke foam layer in the fire protection of cable articles with foaming coating

Tsapko

Likhnyovskyi²,

Tsapko

et al. 2023

EEJET

View full text Add to dashboard Cite

show abstract

Experimental study of flame spread over PE‐insulated single copper core wire under varying pressure and electric current

et al. 2020

View full text Add to dashboard Cite

Summary In this study, the flame spread over a thin wire with overload current (0‐16 A) has been experimentally investigated at both normal pressure (Hefei: altitude 50 m, 100 kPa) and reduced pressure (Lijiang: altitude 2400 m, 76 kPa; Lhasa: altitude 3650 m, 64 kPa). Polyethylene‐insulated single‐core wires, comprising Cu as the inner core of diameter 0.30, 0.50, and 0.80 mm and insulation thickness 0.15 and 0.30 mm, are used as samples. The experimental results clearly indicate that the height of the flame increases with the electric current and ambient pressure, but the flame width changes only slightly. At identical conditions, the finer the wire, the faster the flame spreads. The flame spread rate increases with the electric current and ambient pressure. A simplified thermal balance analysis concerning the load current is developed to calculate the flame spread rate, and the calculated flame spread rates are shown to be fairly consistent with the experimental values at different electric currents for different wires at both ambient pressures. In addition, the coupled effect of electric current and ambient pressure on the flame spread is discussed. These results may be meaningful for promoting the research process of wire fire safety.

show abstract

Flame Spread Along PE-Insulated Wire in Sub-Atmospheric Pressure Enclosure

Cited by 2 publications

References 0 publications

Determining the thermal-physical characteristics of a coke foam layer in the fire protection of cable articles with foaming coating

Determining the thermal-physical characteristics of a coke foam layer in the fire protection of cable articles with foaming coating

Experimental study of flame spread over PE‐insulated single copper core wire under varying pressure and electric current

Contact Info

Product

Resources

About