• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>AIAA aviation forum >Implications of Local Wall Temperature Variations on Second-mode Instability
【24h】

Implications of Local Wall Temperature Variations on Second-mode Instability

机译：局部壁温变化对二模不稳定性的影响

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

摘要

It has been shown that in general, heating the wall beneath second-mode instabilities dampens them, while cooling the wall amplifies them. In this manuscript, the wall temperature was varied locally and entirely along the Purdue flared cone at Mach 6. The purpose of this research was to determine the viability of localized wall temperature variations for controlling second mode growth. Such wall temperature variations could be achieved by embedded thermocouples or, perhaps to a lesser extent, through vehicle material choice. It was found that heating the wall sufficiently upstream amplifies second-mode growth, while heating the wall downstream dampens second-mode growth. The opposite effect is found for wall cooling. It is shown that particular combinations of localized upstream cooling and downstream heating optimally dampens second-mode growth. Physically, this effect can be understood via modulation of the thermal boundary layer, which modifies the acoustic impedance well in which second-modes resonant, and ultimately, the combination of cooling and heating can be interpreted as a clockwise rotation of the stability diagram.
机译：已经表明，通常，在第二模态不稳定性之下加热壁会抑制它们，而冷却壁会放大它们。在此手稿中，壁温在整个马赫数为6时在整个Purdue喇叭形锥上发生局部变化。本研究的目的是确定局部壁温变化在控制第二模式生长方面的可行性。这样的壁温变化可以通过嵌入式热电偶来实现，或者通过较小的车辆材料选择来实现。已经发现，在上游充分加热壁会放大第二模式生长，而在下游加热壁则会抑制第二模式生长。对于壁冷却，发现相反的效果。已经表明，局部上游冷却和下游加热的特定组合最佳地抑制了第二模式的增长。从物理上讲，可以通过调制热边界层来理解这种影响，该调制会很好地修改声阻抗，从而使第二模式产生共振，最终，冷却和加热的组合可以解释为稳定性图的顺时针旋转。

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