基于热解动力学炭/酚醛燃气舵流热耦合数值研究

Numerical research on flow-thermal coupling of carbon-phenolic jet-vane based on pyrolysis kinetics

针对炭/酚醛燃气舵体积烧蚀问题,在Fluent平台上利用UDF二次开发进行了二维非定常流热耦合数值研究。对几何建模、材料变热物性模型及边界条件等问题进行了详尽的描述,并选取了合适的计算模型。对不同舵偏角下燃气舵温度分布、材料密度及边界热流密度等参数进行了分析研究。计算结果表明,燃气舵前缘一直是体积烧蚀最严重区域,随着舵偏角的增大,迎风面体积烧蚀越为严重;由于炭/酚醛材料的特殊性,随着工作时间的推进,从边界进入燃气舵内部热流密度逐渐降低,趋于一个稳定值。研究方法及结论可用于炭化烧蚀类复合材料燃气舵热分析研究。

To solve the problem of volumetric ablation about carbon-phenolic jet-vane,a numerical research on two-dimensional unsteady flow-thermal coupling was done using secondary development on fluent platform. Geometric model,variable thermal properties of carbon-phenolic as well as boundary conditions were described carefully,and a suitable numerical model was selected. Temperature distribution of jet-vane,material density and surface heat flux of jet-vane under different deflection angles of control surface were analyzed. The simulated results show that leading edge is always the most serious volumetric ablative area of jet-vane. As the deflection angle of jet-vane increases,volumetric ablation of upwind side becomes much more serious. Due to the particularity of carbon-phenolic,along with the working time,heat flux into jet-vane from boundary is reduced gradually,and tends to be a stable value. Research method and conclusions can be used in study of jet-vane made of charring materials.