...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aerospace science and technology >Numerical analysis of supersonic flows over an aft-ramped open-mode cavity
【24h】

Numerical analysis of supersonic flows over an aft-ramped open-mode cavity

机译：尾部倾斜开模腔上超音速流动的数值分析

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 characteristics of supersonic cavity flows were investigated using large eddy simulation together with the acoustic analogy method. A fifth-order hybrid compact-weighted essentially non-oscillatory scheme was applied to calculate the convective flux, and a sixth-order compact scheme was used for the viscous flux. Farassat's Formula 1A was used to solve the Ffowcs William-Hawkings equations to obtain the far field acoustic pressure fluctuations. The effects of cavity configuration and flow Mach number on the pressure waves generated by the interaction of shear vortices and cavity were compared. The ramped rear-step of the cavity can increase the more-organized level of flow coherent structures, and decrease the static pressure distribution on the cavity bottom-wall. The attenuation of the interactions between the shear layer vortex and the aft-ramped wall of the cavity can reduce the feedback of pressure waves upstream. The energy of the main frequency significantly decreases for the far-field acoustics in the upstream flow over the ramped rear-step cavity. Thus, the effectiveness of noise reduction by the rear ramp is considerable for the area upstream of the cavity for the present conditions, but it is not the case opposite to and downstream of the cavity. The present conclusions are valuable for evaluating the performance of noise suppression by cavities embedded in supersonic inflows in engineering applications. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：利用大涡模拟和声学模拟方法研究了超声速腔的流动特性。应用五阶混合紧致加权基本非振荡方案来计算对流通量，而六阶紧致方案用于粘性通量。 Farassat的公式1A用于求解Ffowcs William-Hawkings方程，以获得远场声压波动。比较了腔结构和流动马赫数对剪切涡与腔相互作用产生的压力波的影响。空腔的倾斜后台阶可以增加流动相干结构的组织度，并减小空腔底壁上的静压分布。剪切层涡旋与腔体的后倾斜壁之间的相互作用的衰减可以减小上游压力波的反馈。对于在倾斜后阶梯腔上方的上游流中的远场声学，主频率的能量显着降低。因此，在当前条件下，对于后腔的上游区域而言，通过后斜坡降低噪声的效果是相当可观的，但是在后腔的相反和下游的情况并非如此。本结论对于评估工程应用中超音速流入中嵌入的腔体抑制噪声的性能非常有价值。 （C）2018 Elsevier Masson SAS。版权所有。

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