基于原位风沙流观测的广冲击角的溅射函数构建

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中文摘要：风沙流中沙粒与床面的相互作用机理是风沙物理学研究的关键问题.由于沙粒运动的复杂性,数值模拟的研究结果通常与实际情况存在较大差异,因此,以实验手段得到的击溅函数对于理解粒-床碰撞的物理过程具有重要意义.基于饱和风沙流内气流对碰撞过程的影响可以忽略不计的共识,学者们通过大量的无风碰撞实验进行击溅函数研究.然而,由于测量技术的限制,典型冲击角度(10°)下的粒-床碰撞过程的实测数据很少.鉴于数值模拟和无风碰撞实验都表明击溅函数对冲击角度较为敏感,基于高速摄影技术在风洞内获得了松散沙床表面大量冲击角在10°左右的粒-床碰撞过程,并结合前人沙粒离心发射器(冲击角20°～50°)的实验结果,构建了涵盖广泛冲击角度的溅射函数,这些函数能够适用于前人不同实验条件的风洞实验结果,这对未来的风沙物理学研究具有重要意义.

外文标题：Constructing splash functions with a wide impact angle based on in-situ observation of aeolian sand flow

外文摘要：The interaction mechanism between sand particles and the bed surface in aeolian sand flow consti-tutes a key issue in aeolian physics research.Owing to the complexity of sand particle movement,the research re-sults from numerical simulation typically deviate significantly from the actual situation.Consequently,the splash functions obtained through experimental means holds great significance for understanding the physical process of particle-bed collision.Based on the consensus that the influence of airflow in saturated aeolian sand flow on the collision process can be neglected,scholars conduct splash functions research by means of a large number of windless collision experiments.However,due to limitations in measurement technology,there are scarce mea-sured data of the particle-bed collision process under the typical impact angle of 10°.Considering that both nu-merical simulation and windless collision experiments indicate that the splash functions are sensitive to the im-pact angle,a large number of particle-bed collision processes with an impact angle around 10° on the surface of a loose sand bed are obtained in a wind tunnel by utilizing high-speed photography technology.Combined with the experimental results of predecessors'sand grain centrifugal launcher(with an impact angle ranging from 20° to 50°),the splash functions covering a wide range of impact angles are constructed.These functions can be ap-plied to the wind tunnel experiment results of predecessors under different experimental conditions,which is of great significance for future research in aeolian physics.

外文关键词：

splash functionssaltation movementwind tunnel experimentparticle-bed collision processhigh-speed photography technology

作者：

蒋缠文、董治宝、罗万银、钱广强、张正偲、逯军峰、王晓艳

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作者单位：

渭南师范学院环境与生命科学学院/陕西省河流湿地生态与环境重点实验室,陕西渭南 714000

陕西师范大学地理科学与旅游学院,陕西西安 710119

中国科学院西北生态环境资源研究院,甘肃兰州 730000

关键词：

击溅函数跃移运动风洞实验粒-床碰撞过程高速摄影技术

基金：

国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目中国博士后科学基金项目中国科学院沙漠与沙漠化重点实验室开放课题陕西省教育厅重点实验室项目

项目编号：

4190101241971014419306402019M663615KLDD-2021-00522JS017

出版年：

2024

DOI：

10.7522/j.issn.1000-694X.2024.00122

中国沙漠

中国科学院寒区旱区环境与工程研究所

中国沙漠

CSTPCD北大核心

影响因子：1.504

ISSN：1000-694X

年,卷(期)：2024.44(5)