| Pollutant Concentration Distribution Behind Peninsular Models |
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| 作者姓名： | 梁东方 李玉樑 李云生 江春波 |
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| 作者单位： | LIANG Dongfang，LI Yuliang LI Yunsheng，JIANG Chunbo Department of Hydraulic and Hydropower Engineering，Tsinghua University，Beijing 100084，China |
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| 基金项目： | Supported by the National Natural Science Foundationof China(No.5 0 0 790 10 ) |
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| 摘 要： | IntroductionUnstable large- scale vortex structures are knownto exist in the wake region behind bluff bodies.Conventional measurement instruments such asPitot tubes,hot wires and light absorption probeshave great difficulties in measuring such unstableflows because they are single- point instrumentswhich will also disturb the flow.However,therapid developmentofelectronicsand signal analysistheory has greatly improved the ability of classicalflow visualization methodswhich were traditionallyonl…
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Pollutant Concentration Distribution Behind Peninsular Models |
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| LIANG Dongfang,LI Yuliang LI Yunsheng,JIANG Chunbo.Pollutant Concentration Distribution Behind Peninsular Models[J].Tsinghua Science and Technology,2002,7(6). |
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| Authors: | LIANG Dongfang LI Yuliang LI Yunsheng JIANG Chunbo |
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| Institution: | LIANG Dongfang,LI Yuliang LI Yunsheng,JIANG Chunbo Department of Hydraulic and Hydropower Engineering,Tsinghua University,Beijing 100084,China |
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| Abstract: | Planar laser-induced fluorescence (PLIF) was used to study the characteristics of pollutant mixing and transport in wakes behind peninsula-type bodies. Fluorescein sodium was introduced 40 cm upstream of the peninsula as a tracer. The concentration field was measured behind semicircula-shape and sinusoid-shape peninsulas for steady inlet flows for a distance of seven radii downstream of the bodies. Analysis of the mean concentration and root mean square concentration fields showed that two factors mainly affected the concentration field in the near wake, the convection of pollutants with the main flow and the entrainment in the mixing shear layer. The impact of the shape on the concentration distribution is complex because of these two factors. In the present experiments, the semicircular peninsula caused better pollutant mixing, while the sinusoidal peninsula resulted in higher concentrations in the near wake region. |
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| Keywords: | wake concentration field planar laser-induced fluorescence (PLIF) |
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