Abstract
The experimental work involves calculation of radial distribution of heat transfer flux at the surface of a flat steel un-cooled plate being impinged by a turbulent flame jet. A high temperature heat flux thermal Image camera (AGEMA Infrared system –Thermovision&900 Series) used to measure the transient total heat flux and temperature distribution at the plate surface. Qualitative temperature measurements have been performed for four identified combustion modes using a thermal-imaging camera. Flame-impinged wall temperature measurements have been performed to understand the near wall characteristics of impinging flames. The experiments have shown that the “flame switching off” technique is a reasonably accurate method for the measurements of flame impinging plate wall temperatures and heat flux. The results show that there are many factors affect the near wall flame structure and the heat transfer. These factors include the turbulence intensity, the nozzle mean flow velocity, the flame mode, and the nozzle-to-plate separation. The large vortices, which appear in the disc flame without a TG, can enhance the combustion significantly, leading to a better heat transfer to the wall. Turbulence characteristics can modify the near wall flame structure significantly and therefore, the heat transfer pattern to the flame impinged plate will be improved. KEYWORDS: Impinging Flame; thermal image camera; flame mode; heat transfer