...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Aeronautical Journal >Some features of steady separated flow from low speed to hypersonic
【24h】

Some features of steady separated flow from low speed to hypersonic

机译：从低速到高超声速的稳定分离流的某些特征

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 basic features of steady base flow are seen to be amenable to analysis through Roshko's theory wherein the wake aspect ratio is defined by the balance between the average shear force parameter and the pressure force parameter [C_p~*] on the dividing streamline. It is remarkable that the theory seems to give reasonable results at high supersonic and hypersonic Mach numbers even though the separation bubble is assumed to be a 'dead water' region where one would expect a vigorous recircu-lation zone with strong reverse velocities. There is a marked shrinking in the wake aspect ratio from about three base diameters/heights in incompressible flow to about one base diameter/height at supersonic and hypersonic Mach numbers. The main reasons for this are the rapid decrease in the value of shear force parameter and the compressibility function κ (that governs the shear layer growth rate) which are seen to rapidly decrease between incompressible and supersonic speeds and then tending to near constant values at hypersonic Mach numbers. The paper reinforces the observations of Roshko on steady wake flow of bluff bodies but further elucidates its validity at higher Mach numbers.
机译：稳定基流的基本特征被认为可以通过Roshko的理论进行分析，其中尾流纵横比由平均剪切力参数与压力参数[C_p〜*]之间的平衡来定义。分界线。值得注意的是，该理论似乎在高超声速和高超声速马赫数下给出了合理的结果，即使分离气泡被认为是一个“死水”区域，在该区域中人们会期望有一个强劲的逆向速度的强劲回流区。在超音速和高音速马赫数下，尾流纵横比从不可压缩流中的大约三个基本直径/高度明显减小到大约一个基本直径/高度。造成这种情况的主要原因是剪切力参数的值迅速减小，而压缩率函数κ（控制剪切层的生长速度）则在不可压缩和超音速之间迅速减小，然后趋向于在高超声速马赫数时接近恒定值。这篇论文加强了Roshko关于钝体的稳定尾流的观察，但进一步阐明了其在较高马赫数下的有效性。

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