2 0 0 0 D232 PIV のキャビテーション流れへの応用
We propose the new PIV image processing method to apply to the cavitation flow field. Two CCD cameras take each image shots of good quality utilizing the difference of the scatter light intensity between the seeding particles and the bubbles. From the image of the seeding particles, the cavitation aspect information such as the void fraction and the cavity boundary is obtained by using the binary process of the light intensity. From both images of the seeding particles and the bubbles, two velocity informations are obtained individually inside or outside area of the cavity by using the cross correlation method and composed into one. For the evaluation of this PIV measurement and processing, the experiment was carried out about the wake vortex cavitation flow behind a wedge. And also, the cavity area and the void fraction map, the vector map and the vorticity map were discussed in detail
1 0 0 0 OA 地下鉄駅構内の空気流動に関する実験的研究(第1報,駅内部空気流と列車風緩和)
- 著者
- 白鳥 敏正 松平 晏明 小西 奎二 桜井 忠一
- 出版者
- 社団法人日本機械学会
- 雑誌
- 日本機械学会論文集(B編) (ISSN:03875016)
- 巻号頁・発行日
- vol.58, no.546, pp.182-187, 1992-02-25
Scale model experiments were made to investigate the steady and unsteady airflow characteristics in an underground railway station. The experimental apparatus consists of a scale model of a two-layer underground railway station and train wind generators that simulate the steady and unsteady airflow caused by trains. The steady and unsteady airflows were measured with hotwire anemometers at several points of the station for several cases. The unsteady airflow patterns were almost identical to the estimated airflow patterns obtained from steady values. The method of reducing the train wind effect in a station by means of tunnel ventilation dynamic control was considered and its effectiveness was confirmed through experimentation.