管道風流PIV實驗中示蹤粒子特性
發(fā)布時間:2018-12-18 15:42
【摘要】:為選擇適合巷道風流PIV實驗的示蹤粒子,以6種不同物理屬性的固體微粒為實驗粒子,利用PIV系統(tǒng)采集管道突擴模型下隅角附近的粒子圖像.用粒子圖像的曝光度、信噪比及處理后得到的矢量、流線圖來反映粒子的光學和動力學特性.研究結果表明:粒徑是影響示蹤粒子跟隨性、散射性、均勻性和信噪比的主導因素;粒徑越小,粒子跟隨效果越好而散射性和信噪比越差;當測試區(qū)域較大時,示蹤粒子適宜的粒徑范圍為0.2~2μm,可選擇光擴散劑或二氧化硅;當對流場細節(jié)要求較高時,可選擇粒徑0.2μm以下的祭祀燃香煙霧粒子.
[Abstract]:In order to select tracer particles suitable for wind flow PIV experiment in roadway, six kinds of solid particles with different physical properties were used as experimental particles. The particle images near the corner of pipe expansion model were collected by PIV system. The optical and dynamic properties of the particles are reflected by the exposure of the particle image, the SNR, the vector obtained after processing and the streamline diagram. The results show that the particle size is the leading factor affecting the tracer particle's following, scattering, uniformity and signal-to-noise ratio, and the smaller the particle size is, the better the particle follow effect is, and the worse the scattering and signal-to-noise ratio (SNR) are. When the test area is large, the suitable particle size range is 0.2 渭 m, the photodiffuser or silica can be selected, and the sacrificial incense smoke particle with diameter less than 0.2 渭 m can be selected when the detail of flow field is high.
【作者單位】: 遼寧工程技術大學安全科學與工程學院;礦山熱動力災害與防治教育部重點實驗室;
【基金】:國家自然科學基金項目(51574142)
【分類號】:TD721
本文編號:2386065
[Abstract]:In order to select tracer particles suitable for wind flow PIV experiment in roadway, six kinds of solid particles with different physical properties were used as experimental particles. The particle images near the corner of pipe expansion model were collected by PIV system. The optical and dynamic properties of the particles are reflected by the exposure of the particle image, the SNR, the vector obtained after processing and the streamline diagram. The results show that the particle size is the leading factor affecting the tracer particle's following, scattering, uniformity and signal-to-noise ratio, and the smaller the particle size is, the better the particle follow effect is, and the worse the scattering and signal-to-noise ratio (SNR) are. When the test area is large, the suitable particle size range is 0.2 渭 m, the photodiffuser or silica can be selected, and the sacrificial incense smoke particle with diameter less than 0.2 渭 m can be selected when the detail of flow field is high.
【作者單位】: 遼寧工程技術大學安全科學與工程學院;礦山熱動力災害與防治教育部重點實驗室;
【基金】:國家自然科學基金項目(51574142)
【分類號】:TD721
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