The effects of water vapor concentration on the rate of combustion of an artificial graphite in humid air flow

✍ Scribed by Kiyoshi Matsui; Hiroshi Tsuji; Atsushi Makino

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 686 KB
• Volume: 50
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(83)90053-6

✦ Synopsis

Test specimens of graphite were burned in a stagnation region of an impinging oxidizer flow under atmospheric pressure. The shape of the test specimen was a disk of 10 mm in diameter and 1 mm in thickness. The mole fractions of water vapor in air were 0.0022, 0.017, and 0.08; the velocity gradients 22.0, 88.8, and 343 s-I. The surface temperature of the test specimen was kept constant during each experimental mn by an external heat source in a range of 1200-1600K. The following results have been obtained: (1) Even when the water vapor concentration in humid air is high, the burned mass increases linearly with the burning time up to 120 s. (2) The increase in the water vapor concentration in humid air reduces the combustion rate in a surface temperature range of 1300-1600K. (3) For the decrease in the oxygen concentration caused by the increase in the water vapor concentration up to a certain value, the combustion rate diminishes to a greater extent than would be found for simple dilution of oxygen.