...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Combustion and Flame >The response of a propane-air counter-flow diffusion flame subjected to a transient flow field
【24h】

The response of a propane-air counter-flow diffusion flame subjected to a transient flow field

机译：瞬态流场对丙烷-空气逆流扩散火焰的响应

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

OH planar laser-induced fluorescence (PLIF) and particle image velocimetry have been used to study the frequency response of laminar C_3H_8-air counterflow diffusion flames to assess the adequacy of the steady-flamelet models. Particle image velocimetry was used to determine the flame strain rate, while OH PLIF was used both to measure temperature at the flame front, using the two-line PLIF technique, and the reaction-zone width. Both measurements demonstrate that the frequency response of flames subjected to a time-varying flow field is diffusion-limited. At the 30-Hz and 50-Hz forcing frequencies, the maximum reaction-zone temperature and width were found to respond quasi-steadily. However, at higher forcing frequencies-i.e., 100 and 200 Hz-transient behavior is evident from the phase relationship between the imposed sinusoidal strain rate and the resulting peak temperature and reaction-zone width. The measured values of the OH-field widths were well fit by an offset sine function. In all cases when the oscillation amplitude is normalized by the cycle mean strain rate and plotted against the non-dimensional flow field frequency, the results collapse onto a single line Raving a steep negative slope.
机译：OH平面激光诱导荧光（PLIF）和粒子图像测速技术已用于研究层流C_3H_8-空气逆流扩散火焰的频率响应，以评估稳定小火焰模型的适用性。颗粒图像测速仪用于确定火焰应变率，而OH PLIF用于使用两线PLIF技术测量火焰前沿的温度和反应区宽度。两种测量结果均表明，经受时变流场的火焰的频率响应受到扩散限制。在30 Hz和50 Hz的强迫频率下，发现最大反应区温度和宽度准稳态响应。但是，在较高的强迫频率下（即100和200 Hz），从所施加的正弦应变速率与所产生的峰值温度和反应区宽度之间的相位关系可以看出瞬态行为。 OH场宽度的测量值通过偏移正弦函数很好地拟合。在所有情况下，当将振动幅度通过循环平均应变率归一化并针对无量纲流场频率进行绘制时，结果将折叠到一条具有陡峭负斜率的直线上。

著录项

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