Cooperative Study on the Mechanics of Vortex Flow

涡流力学的合作研究

基本信息

批准号：
07045030
负责人：
NISHI Michihiro
金额：
$ 3.26万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07045030/
关键词：
Vortex Flow Vortex Structure Vortex Method Longitudinal Vortex Vortex Generator Jet Spiral Vortex Core Pressure Fluctuation Flow Control 翼端渦はく離渦

项目摘要

In order to carify various facets of vortex theoretically and experimentally, three years research program entitled "Cooperative Study on the Mechanics of Vortex Flow" has been carried out successfully based on the idea to promote both a related individual study made by each of researchers engaging this program and cooperative studies made by the several researchers between Kyushu Institute of Technology and Old Dominion University. Major contributions for this fiscal year are as follows :1. A collaborative study to clarify experimentally the behavior of longitudinal vortex generated by an inclined weak jet issued from the wall was made using a cirsular pipe and a 14 deg conical diffuser together with a three-dimensional hot-wire velocimeter. It is noted that the nonuniform decay of the vortices generated by the jets was predominant in the latter case. Further experiments show that the vortex generator jet (VGJ) method is effective to control the separation in a diffuser, and they provide the useful information on the various parameters for designing VGJ.2. A longitudinal vortex generated by a jet in a pipe is also confirmed numerically in the results with coarse grids, though further refinement of the computation is desirable.3. A quasi 3-D mathematical model for a spiral vortex core in an axisymmetric conduit was demonstrated to calculate both axial and peripheral components of velocity in the flow with swirl. Its usefulness is examined by the comparison between the experiment and the calculation.4. A new measurement method for fluctuating wall-pressure has been developed by using pressure conductive rubber sheet. Further development will be expected by its application to various vortex flows.5. Concerning the unsteady flow in a turbopump, it is shown that the reasonable prediction will be made by a numerical analysis based on the vortex method.

为了在理论上和实验上扭曲涡流的各个方面，三年的研究计划题为“关于涡流流量机制的合作研究”，基于这个想法成功地进行了成功，以促进kyushu kyushu研究所在技术研究所和旧研究人员之间进行的每个研究人员进行的相关个人研究。本财政年度的主要贡献如下：1。一项协作研究，旨在通过实验阐明由壁上发行的倾斜弱喷射产生的纵向涡流的行为，是使用卷心管和14摄氏度的锥形扩散器以及三维热线速度计的。值得注意的是，在后一种情况下，喷气机产生的涡旋的非均匀衰变主要是主导。进一步的实验表明，Vortex Generator Jet（VGJ）方法有效地控制扩散器中的分离，并且它们提供了有关设计VGJ.2的各种参数的有用信息。射流在管道中产生的纵向涡流在具有粗网格的结果中也得到了数值的确认，尽管需要进一步的计算细化。3。证明了轴对称导管中螺旋涡流芯的准3-D数学模型，可以用旋流计算流动速度的轴向和外围成分。通过实验与计算之间的比较来检查其有用性。4。通过使用压力导电橡胶片，已经开发了一种新的用于波动壁压的测量方法。将其应用于各种涡流流5。关于涡轮机中不稳定流的流动，这表明合理的预测将通过基于涡旋方法的数值分析进行。