基于定制孔隙的多孔介质反应流热质传递研究

Porous media play a key role in the fields of energy conversion, thermal management and energy storage due to their outstanding advantages such as large surface area, light weight and complex channels. In this paper, the homogeneous porosity and gradient porosity W type porous structure (porosity ε=0.3∼0.5, hydraulic diameter d_h=1.33∼3.86 mm) were customized based on the triply periodic minimal surface (TPMS) method. A computational model of combustion reaction of porous media was established to investigate the range of flame stabilization within the W type porous structure and the SC-BCC cubic lattice structure, and the results showed that the flame blowout of W type structure limitation is higher (equivalence ratio φ=0.65 and inlet velocity V_in=0.6∼2.2 m·s⁻¹). Furthermore, the regulation of combustion and heat transfer processes by the W type porous structure with continuous gradient porosity was investigated, and the results showed that the continuous gradient porous structure would significantly broaden the range of flame stabilization by adaptively modifying the heat rejection rate.