The temperature field of a laminar diffusion dust flame

✍ Scribed by J.I. Vovchuk; N.I. Poletaev

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 485 KB
• Volume: 99
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(94)90065-5

✦ Synopsis

The temperature field of aluminum, laminar diffusion, dust flames (LDDF) has been studied using holographic interferometry. Radial temperature profiles of LDDF have been determined at twelve crosssection heights above the dust burner. The widths of the burning and preheating zones and the burning temperature have been investigated. The data obtained were used to elucidate the similarities and differences of LDDF and laminar diffusion gaseous flames, and to determine the controlling mechanism of dust combustion. The results indicate that aluminum dust (d = 4.8 ~m), nonpremixed with gaseous oxygen, burned out in diffusion regime.

The discrepancy of the flame shapes obtained by holographic interferometry and photography suggests that the most intensive chemical reaction zone and the aluminum oxide condensation zone may be separated.

The main differences between laminar diffusion dust and gaseous flames are due to the presence of condensed fuel and burning products in the LDDF flow field and to the absence of the diffusion of dispersed fuel particles to the gaseous oxidizer.