...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of propulsion and power >Supersonic Combustion and Flame Stabilization of Coflow Ethylene and Air with Splitter Plate
【24h】

Supersonic Combustion and Flame Stabilization of Coflow Ethylene and Air with Splitter Plate

机译：隔板对并流乙烯与空气的超音速燃烧与火焰稳定

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A numerical investigation of supersonic combustion for ethylene and air coflow with a splitter plate is presented, mimicking the flame stabilization and combustion establishment in a dual-combustion ramjet engine. Emphasis is placed on the detailed flow and flame characteristics immediately downstream of the splitter plate and in the shock-wave/shear-layer interaction regions. Three different splitter-plate thicknesses, 2, 4, and 8 mm, are considered, to identify the significance of the geometric parameters. The analysis is based on the Favre-averaged conservation equations for compressible chemically reacting flows. Turbulence closure is achieved using Menter's shear-stress transport model with a detached-eddy-simulation extension. Chemical reactions are modeled using a nine-species, ten-step laminar chemistry model with sufficient numerical resolution. Various mechanisms dictating the flame anchoring and spreading properties are examined. The hot stream from the ethylene preoxidization in the gas generator is found to behave like an underexpanded supersonic jet Its subsequent expansion in the present wall-confined environment has a strong influence on the near-field mixing and combustion. Depending on the splitter-plate thickness, the wake region behind the splitter plate changes in size, and the autoignited flame can be either attached to or detached from the rim. The majority of chemical reactions take place in the mixing layer farther downstream, and the combustion efficiency varies in accordance with the near-field phenomena.
机译：提出了利用隔板对乙烯和空气顺流进行超音速燃烧的数值研究，模拟了双燃烧冲压发动机的火焰稳定和燃烧建立。重点放在直接在分流板下游和冲击波/剪切层相互作用区域中的详细流动和火焰特性。为了确定几何参数的重要性，考虑了三种不同的分隔板厚度（2、4和8 mm）。该分析基于可压缩化学反应流的Favre平均守恒方程。使用Menter的剪切应力传递模型和分离的涡流模拟扩展来实现湍流闭合。使用具有足够数值分辨率的九种，十步层流化学模型对化学反应进行建模。检查了指示火焰固定和扩散特性的各种机制。发现在气体发生器中来自乙烯预氧化的热流表现得像超音速射流的膨胀不足。在当前的壁密闭环境中，其随后的膨胀对近场混合和燃烧有很大的影响。根据分隔板的厚度，分隔板后面的尾流区域的大小会发生变化，并且自动点燃的火焰可以附着在轮辋上，也可以从轮辋上脱离。大多数化学反应发生在更下游的混合层中，燃烧效率根据近场现象而变化。

著录项

  • 来源
    《Journal of propulsion and power》 |2015年第5期|1242-1255|共14页
  • 作者

    Liwei Zhang; Jeong Yeol Choi; Vigor Yang;

  • 作者单位

    Georgia Institute of Technology, Atlanta, Georgia 30332;

    Georgia Institute of Technology, Atlanta, Georgia 30332;

    Georgia Institute of Technology, Atlanta, Georgia 30332;

  • 收录信息
  • 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