Infrared High-speed Thermography of Combustion Chamber Wall Impinged by Diesel Spray Flame

- Effects of Wall Surface Roughness on Heat Transfer -

Abstract

In order to investigate effects of wall surface roughness on heat transfer on the wall impinged by diesel spray flame, chromium-coated quartz windows with optical polished and roughened surfaces were prepared and infrared thermography of the back surface of the coating was conducted using a high-speed infrared camera. The experimental results showed that both surface cases exhibit radially striped waving patterns of radiation intensity. However, roughened surface case exhibited more vaguely delineated and quickly dissipating distributions of temperature, heat flux and radiation pattern moving velocity compared to the optical polish case.