• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Spacecraft and Rockets >Effects of Nonequilibrium Chemistry and Darcy—Forchheimer Pyrolysis Flow for Charring Ablator
【24h】

Effects of Nonequilibrium Chemistry and Darcy—Forchheimer Pyrolysis Flow for Charring Ablator

机译：非平衡化学和达西的作用-炭化烧蚀剂的Forchheimer热解流量

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The fully implicit ablation and thermal response code simulates pyrolysis and ablation of thermal protection materials and systems. The governing equations, which include energy conservation, a three-component decomposition model, and a surface energy balance, are solved with a moving grid. This work describes new modeling capabilities that are added to a special version of code. These capabilities include a time-dependent pyrolysis gas flow momentum equation with Darcy—Forchheimer terms and pyrolysis gas species conservation equations with finite-rate homogeneous chemical reactions. The total energy conservation equation is also enhanced for consistency with these new additions. Two groups of parametric studies of the phenolic impregnated carbon ablator are performed. In the first group, an Orion flight environment for a proposed lunar-return trajectory is considered. In the second group, various test conditions for arcjet models are examined. The central focus of these parametric studies is to understand the effect of pyrolysis gas momentum transfer on material in-depth thermal responses with finite-rate, equilibrium, or frozen homogeneous gas chemistry. Results indicate that the presence of chemical nonequilibrium pyrolysis gas flow does not significantly alter the in-depth thermal response performance predicted using the chemical equilibrium gas model.
机译：完全隐式的烧蚀和热响应代码模拟了热防护材料和系统的热解和烧蚀。用移动网格求解控制方程，其中包括能量守恒，三成分分解模型和表面能平衡。这项工作描述了新的建模功能，这些功能已添加到特殊版本的代码中。这些功能包括具有达西-福希海默项的随时间变化的热解气体动量方程和具有有限速率均相化学反应的热解气体物种守恒方程。为了与这些新增加的内容保持一致，总的节能公式也得到了增强。进行了两组关于酚醛浸渍碳烧蚀剂的参数研究。在第一组中，考虑了拟议的月球返回轨迹的猎户座飞行环境。在第二组中，检查了用于arcjet模型的各种测试条件。这些参数研究的重点是了解热解气体动量传递对有限速率，平衡或冷冻均质气体化学作用下材料深度热响应的影响。结果表明，化学非平衡热解气流的存在不会显着改变使用化学平衡气体模型预测的深度热响应性能。

著录项

  • 来源
    《Journal of Spacecraft and Rockets》 |2013年第2期|256-269|共14页
  • 作者

    Yih-Kanq Chen; Frank S. Milos;

  • 作者单位

    NASA Ames Research Center, Moffett Field, California 94035-1000;

    NASA Ames Research Center, Moffett Field, California 94035-1000;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号