Abstract
The characteristics of a ‘clean’ heat flux-meter that is air stream cooled and protected against ash deposit formation are presented. The steady state radial temperature difference across the receiving disc of the heat flux-meter is both obtained numerically, using the finite element method, and measured experimentally. Moreover, the steady state receiving disc temperature field circumferential uniformity and the dynamic response of the flux-meter to stepwise changes in the incident heat flux are investigated. The experimental data and numerical results indicate that the radial temperature difference depends linearly on the incident heat flux. The signal vs the air flow rate is also obtained. At steady state conditions and higher air flow rates, the receiving disc temperature field can be considered circumferentially uniform. The dynamic response of the heat flux-meter is satisfactory.
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