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仪器网/ 行业应用/ 解决方案/ 空气水界面两侧破碎波的高速PIV测量研究

空气水界面两侧破碎波的高速PIV测量研究

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This paper presents high speed Particle Image Velocimetry (PIV) experiments on small-scale, steep,
breaking waves forced by shoa领 the waves up an angled slope to a level plateau, in a lidded tank with an initially
quiescent air-side. Both spil领 and plunging breakers are considered. A PIV system, using a high speed digital
video camera at up to 500 frames per second, was used to obtain quantitative data on both the air and water side of
the free surface interface. Waves are generated by a computer controlled, paddle-type wave maker at one end of
long, narrow acrylic tank. In order to obtain breaking waves on a small scale, surface tension was lowered by
mixing isopropyl alcohol with distilled water. Surface tension characteristics of the water-IPA mixture are also
presented herein. To perform high speed PIV measurements, a low-cost, Lasiris Magnum, near-IR, TTL diode line
generator laser is used to form the light sheet. To seed the water, traditional silver coated hollow-glass spheres
were used. While seeding in the water was quite straight-forward, seeding in the air was quite complex. In order
not to adversely affect the surface tension, a water-based fog was used to seed the air. Qualitative visualizations and
PIV show the formation of the vortex aft of the breaking wave and reveal strong counterclockwise vorticity in the air
side of the interface. Results for the plunging breaking wave case are presented herein and compared with
numerical results from Hendrickson (2004). 德国LaVision PIV/PLIF粒子成像测速场仪 时间分辨粒子成像测速系统(TR-PIV) HighSpeedStar PIV相机
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