Experimental Study of Graphite Ablation in Nitrogen Flow, Part II: Further Numerical Analysis
Experimental Study of Graphite Ablation in Nitrogen Flow, Part II: Further Numerical Analysis
复制标题
氮气流中石墨烧蚀的实验研究，第二部分：进一步的数值分析
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Sakai
中科院分区：
文献类型：
--
作者：
Toshiyuki Suzuki;K. Fujita;T. Sakai
采用积分计算方法分析了感应耦合等离子体风洞中加热石墨的烧蚀行为，考察了石墨表面发生氮化反应的概率值。在该方法中，等离子体炬在试验室的入口处的自由状态的评估通过计算在等离子体炬中的流动。利用该自由边界条件，将热化学非平衡流体动力学程序与二维热传导方程求解器松散耦合，计算了石墨试件的热响应。使用计算工具，在几个时间步长的石墨试样的表面轮廓计算通过改变氮化反应的概率值，并与加热试验中测得的那些进行比较。试验箱中残留杂质的影响也被考虑在内。作为研究的结果，建议氮化反应的概率值为0.003是合理的，以解释石墨试样在加热试验中的质量损失量。
The ablative behavior of graphite heated in an inductively coupled plasma wind tunnel is analyzed using an integrated computational method to examine the probability value of nitridation reaction occurring at graphite surface. In this method, the plasma torch freestream condition at the entrance of the test chamber is evaluated by calculating the flows in the plasma torch. The thermal response of the graphite test piece is calculated by loosely coupling the thermochemical nonequilibrium fluid dynamics code and two-dimensional heat conduction equation solver using the freestream condition so valuated. Using a computational tool, surface contours of the graphite test piece at several time steps are calculated by varying the probability value of nitridation reaction and are compared with those measured in the heating test. The effect of impurities remaining in the test chamber is also taken into account. As a result of the study, it is suggested that a probability value of 0.003 for nitridation reaction is reasonable to explain the amount of mass loss of the graphite test piece in the heating test.