• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >The thermal ignition behavior of nitramine-based solid propellants.
【24h】

The thermal ignition behavior of nitramine-based solid propellants.

机译：硝胺基固体推进剂的热着火行为。

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

Solid propellant formulations must meet strict performance and safety requirements. The advent of nitramine-based propellants to meet these standards has necessitated greater understanding of the ignition transient. The ignition of a nitramine-based solid propellant (XM39) subjected to conductive, convective and radiative heat transfer was examined both experimentally and theoretically. The objectives were to develop small-scale tests to screen potential propellants and evaluate relationships between these ignition mechanisms. Important chemical and physical processes were identified in separate experiments. Convective and conductive experiments were performed in a shock tube. A CO;Observed location of convective ignition indicates gas-phase chemical processes are important. Ignition delay was reduced by increases in temperature, pressure and oxidizer concentration of ambient gases. An inert heating analysis of the data was inappropriate because chemical and flow effects are important. Sharp edges on the propellant surface enhance ignition through increased heat transfer. Microscopic analysis of recovered samples show the formation of a "melt" layer but its importance is unknown.;A transient, one-dimensional ignition model for XM39 was validated using radiative ignition data. The model relies on gas-phase heat release with feedback to the propellant surface. Ignition criteria was a sharp increase in gaseous CO;The model shows that conductive ignition is governed by the propellant gasification rate. Thermal boundary layer formation reduces surface heat flux; slowing the generation of gaseous decomposition species.;Several gun propellants were fractured under shock impact with subsequent heating to study vulnerability to shaped-charge jet penetration. Ignition delay times for all propellants (JA2, M30, XM39 and M43) were reduced with induced fracture. Increased convective heating to sharp edges is the most probable mechanism. The nitramine-based propellants displayed brittle fracture making them more susceptible to violent response.
机译：固体推进剂配方必须满足严格的性能和安全要求。满足这些标准的硝胺基推进剂的问世需要对点火瞬变有更深入的了解。通过实验和理论研究了经过传导，对流和辐射传热的硝胺基固体推进剂（XM39）的着火性。目的是开发小规模测试以筛选潜在的推进剂并评估这些点火机制之间的关系。在单独的实验中确定了重要的化学和物理过程。在激波管中进行对流和传导实验。观察到的对流点火位置表明气相化学过程很重要。温度，压力和环境气体氧化剂浓度的增加减少了点火延迟。对数据进行惰性加热分析是不合适的，因为化学和流动效应很重要。推进剂表面上的尖锐边缘通过增加的热传递来增强点火。回收样品的显微分析表明形成了“融化”层，但其重要性尚不清楚。;使用辐射点火数据验证了XM39的瞬态一维点火模型。该模型依赖于气相热释放并反馈至推进剂表面。着火标准是气态CO的急剧增加；该模型表明，导电点火受推进剂气化速率控制。热边界层的形成降低了表面热通量；减慢了几种枪支推进剂的冲击冲击力，并随后加热，以研究其对定型射流穿透的脆弱性。由于诱发的骨折，所有推进剂（JA2，M30，XM39和M43）的点火延迟时间缩短了。对流加热到锋利边缘的最可能的机制是。硝胺基推进剂表现出脆性断裂，使它们更容易遭受暴力反应。

著录项

  • 作者

    Ritchie, Steven J.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 205 p.
  • 总页数 205
  • 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