visualisation of flamestructure in coflow diffusion flames (COFLOW)

abstract

An infrared camera is used to obtain a temperature field for a thin laminar diffusion flame. The flame is treated as an emitting surface and a global emissivity is determined by calibration with thermocouples. The configuration is that of a porous burner and an oxidizer flow parallel to the surface. This configuration provides a one-dimensional flame surface that minimizes errors due to spatial integration of the emissions. Experiments have been mostly conducted in microgravity. Preliminary results have shown that calibration of an infrared camera is possible by means of thermocouples and video images. Temperatures for the thin flame surface are presented and the limitations and future developments are explained. Although precision is a primary objective, in this particular case it is clear that the quality of the results is limited by the thermocouple measurements. This compromise is necessary to obtain a full temperature field in a short time period, making this approach especially attractive for short-term microgravity facilities.

• Lynda Brahmi, Thomas Vietoris, José L. Torero and Pierre Joulain: Estimation of boundary layer diffusion flame temperatures by means of an infrared camera under microgravity conditions. Meas. Sci. Technol. 10, 859–865 (1999)

experiment year: 2000
number of drops: 11