発熱反応温度境界層における熱伝達率の壁面温度依存性

概要

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Exothermic boundary layers were observed for a flat plate exposed to a diffusion or premixed methane-air flame using the Laser-Schlieren technique. Wall temperatures tested ranged from 600K to 1000K. The Schlieren photographs were analyzed with a film scanner and the data provided the surface heat fluxes and heat transfer coefficients. The results showed that the heat transfer coefficient increases with increasing wall temperature in the reacting region in contrast to the well-known heat transfer characteristics within nonreactive thermal boundary layers where heat transfer coefficients are almost independent of wall temperature. This behavior provides a possible explanation for the problem of whether heat fluxes increase or decrease during combustion at higher wall temperatures with the use of ceramics for engine combustion chamber walls.
一般社団法人日本機械学会の論文
1992-09-25