权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

SIMULTANEOUS MEASUREMENTS OF VELOCITY AND PRESURE FLUCTUATIONS IN TURBULENTFLOWS

同时测量湍流中的速度和压力脉动

基本信息

批准号：
11650186
负责人：
TOYODA Kuniaki
金额：
$ 2.37万
依托单位：
Hokkaido Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650186/
关键词：
TURBULENT MEASUREMENT PRESSURE FLUCTUATIONS VORTEX TURBULENT ENERGY JET 速度・圧力計測

项目摘要

(1) The combined probe consisting of pressure and X-type hot-wire sensor was developed to measure velocity and fluctuating static-pressure simultaneously in turbulent flows. The systems for the automatic measurement and the high-speed date-processing were developed.(2) The probe was applied to the measurement of the circular jet excited at Strouhal number St = 0.82 in order to regulate the vortex motion in the jet. Using the acquired date, the terms of convection, turbulence diffusion, pressure transport and production of the turbulence energy transport equation were estimated, and turbulence energy budget were discussed in relation to the turbulence structure. The result shows the reliability of the developed probe. In particular it is a significant result of the present study that the term of pressure transport was estimated experimentally.(3) In the axisymmetric mixing layer, the pressure transport (velocity-pressure correlation) was estimated and discussed in relation to the vortex motion. The turbulence models used in the turbulence-energy transport equation and the Reynolds-street transport equation were discussed by the experimental data. The result reveals that the models are not satisfied in the region where the large-scale vortex motion dominates. The result is useful to improve the turbulence models.(4) The sound sources of circular and rectangular jets were discussed focusing on the vortex motions detected by the pressure measurements. The sound sources were estimated by the second time-derivatives of fluctuating static-pressure. The result indicates that the sources are related to pairing and cut-and-connection of vortices.

(1)研制了由压力传感器和x型热线传感器组成的组合探头，用于同时测量湍流中的速度和脉动静压。研制了自动测量和高速数据处理系统。(2)利用探针对Strouhal数St = 0.82时激发的圆形射流进行测量，以调节射流中的涡流运动。利用获得的数据，估计了对流项、湍流扩散项、压力输运项和湍流能量输运方程的生成项，并讨论了湍流结构与湍流能量收支的关系。结果表明，所研制的探头具有较高的可靠性。特别值得一提的是，本研究的一个重要结果是用实验方法估计了压力输运项。(3)在轴对称混合层中，估计并讨论了与涡旋运动相关的压力输运（速度-压力相关性）。通过实验数据讨论了湍流能量输运方程和Reynolds-street输运方程中使用的湍流模型。结果表明，在大尺度涡旋运动占主导地位的区域，模型并不令人满意。所得结果对改进湍流模型有一定的参考价值。(4)讨论了圆形射流和矩形射流的声源，重点讨论了通过压力测量检测到的涡流运动。通过脉动静压二阶导数对声源进行估计。结果表明，这些源与涡旋的配对和切割连接有关。