Effects of participating media on the time-resolved infrared measurements of wall temperature in a coal-fired combustor

The infrared temperature fluctuations on a plate in a coal-fired combustor were measured and the effects of participating media on infrared measurement were revealed. The experimental results were analyzed in both the time and frequency domains. It is found the fluctuations have both random and periodic characteristics. The periodic frequency is identified to be caused by vortex shedding of the gas-particle two-phase flow around a cylinder. This conclusion is supported by a numerical analysis.

► The infrared temperature fluctuations on a plate in a coal-fired combustor were measured.
► The effects of participating media on infrared measurement were revealed.
► The experimental results were analyzed in both the time and frequency domains.
► The temperature fluctuations measured by the infrared thermometer were found to have both random and periodic characteristics.
► The periodic frequency is identified to be caused by vortex shedding of the gas-particle two-phase flow around a cylinder.