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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.

为了从理论上和实验上阐明涡旋的各个方面，在九州理工大学和老道明大学的合作研究的基础上，成功地开展了为期三年的“涡旋力学合作研究”的研究项目。本财政年度的主要捐款如下：利用圆形管道和14度锥形扩压器，结合三维热线测速仪，对从壁面发出的倾斜弱射流产生纵向涡的行为进行了实验研究。值得注意的是，在后一种情况下，射流产生的涡的非均匀衰减占主导地位。进一步的实验结果表明，涡流发生器射流（vortex generator jet， VGJ）方法可以有效地控制扩散器内的分离，并为设计VGJ.2的各参数提供了有用的信息。射流在管道中产生的纵向涡在粗网格上也得到了数值证实，但需要进一步的细化计算。建立了轴对称管道内螺旋涡芯的准三维数学模型，用于计算旋流中的轴向和外周速度分量。通过实验与计算的比较，验证了其有效性。提出了一种利用导压橡胶板测量壁压波动的新方法。将其应用于各种涡旋流动，可望进一步发展。针对涡轮泵内部的非定常流动问题，提出了基于涡旋法的数值分析可以对其进行合理的预测。