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OALib Journal期刊
ISSN: 2333-9721
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风沙流中不同粒径组沙粒的输沙量垂向分布实验研究
DOI: 10.11821/xb200711008, PP. 1194-1203
Keywords: 非均匀风沙流,不同沙粒输沙量分布,粒度分析实验,数值模拟
Abstract:
在非均匀沙床面上,风沙流中不同粒径组沙粒的输沙量垂向分布,是非均匀风沙运动研究的重点。研究首先通过风洞实验,收集了风洞中垂线垂向输沙量分布沙样,然后对集沙沙样进行了沙粒粒度分析实验,实验分析结果得出了不同粒径组沙粒的输沙量垂向分布规律,基于稳定平衡风沙跃移运动模型和本文实验结果,最后数值模拟研究了不同粒径组沙粒输沙量垂向分布,与沙粒起跳速度和角度之间的关系。本文研究结果得出,在非均匀风沙流中,粗粒径组沙粒垂向输沙量上部符合指数递减分布但近床面区偏离指数分布,呈现为偏大型分布,粗粒径组对应的沙粒起跳速度和角度分布均为指数函数；细粒径组沙粒垂向输沙量在整个高度上均符合指数递减规律,细粒径组沙粒对应的起跳速度分布为指数函数,起跳角度分布为高斯函数。沙粒的平均起跳速度,在0.4u*~2.2u*之间变化,随着气流风速(u*)和沙粒粒径的增加而减小。
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