• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ERCOFTAC International Symposium on Engineering Turbulence Modelling and Measurements(ETMM6); 20050523-25; Sardinia(IT) >LDA-MEASUREMENTS OF THE TURBULENCE IN AND AROUND A VENTURI
【24h】

LDA-MEASUREMENTS OF THE TURBULENCE IN AND AROUND A VENTURI

机译：LDA测量文氏管内和周围的湍流

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 flow in and around a Venturi (100 mm diameter pipe, 60 mm diameter throat, water) is experimentally investigated using LDA. The Reynolds number of the flow upstream of the Venturi is 1.9 • 10~5. The experiments provide radial profiles of the mean velocity and turbulence intensities upstream, in the throat, the diffusor part and at various locations downstream of the Venturi. Furthermore, autocorrelations and spectra are presented. Special attention is given to the LDA set up, allowing measuring as close as 120 μm to the wall. The experiments show that the flow in the Venturi and at least 5 diameters downstream of the end of the diffusor is not in equilibrium. The turbulence levels in the throat are much lower than in well developed flow; the opposite is true downstream of the diffusor. A low turbulence intensity jet flows out of the throat into the diffusor, where the turbulence intensity in the wall region is high. The dissipation in the throat is higher than the production. The spectra show that the power of the velocity fluctuations in the throat is low and in the downstream part after the diffusor it is high as compared to the well developed pipe flow.
机译：使用LDA对文丘里管（直径100毫米的管道，直径60毫米的喉管，水）及其周围的流动进行了实验研究。文丘里管上游的雷诺数为1.9•10〜5。实验提供了在喉管，扩散器部分以及文丘里管下游各个位置的平均速度和湍流强度的径向分布图。此外，给出了自相关和光谱。对LDA的设置给予了特别关注，它允许在距墙近120μm的地方进行测量。实验表明，文丘里管中的流量和扩散器末端下游至少5个直径的流量不平衡。喉咙中的湍流水平远低于发达气流中的水平。相反，在扩散器的下游。低湍流强度的射流从喉咙流出，进入扩散器，扩散器的壁区域中的湍流强度很高。喉咙中的耗散高于生产。频谱显示，与发达的管道流相比，喉管中的速度波动功率低，扩散器后的下游部分的波动高。

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