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Journal of Chinese Agricultural Mechanization

Journal of Chinese Agricultural Mechanization ›› 2024, Vol. 45 ›› Issue (5): 253-257.DOI: 10.13733/j.jcam.issn.2095-5553.2024.05.038

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Analysis of influence of secondary flow in sand sampler on the collecting range of sand

Song Tao, Xie Xuehu, Zhang Liang, Liu Honghao, Ni Yuquan   

  • Online:2024-05-15 Published:2024-05-22

集沙仪内二次流对沙尘收集范围的影响分析

宋涛,谢学虎,张良,刘洪豪,倪玉权   

  • 基金资助:
    山东省自然科学基金资助项目(ZR2021QE217);山东省科技型中小企业创新能力提升工程项目(2023TSGC0678);泰安市科技发展计划项目(2021NS087)

Abstract: Secondary flow is a common physical phenomenon in engineering practice, which is a secondary flow relative to the mainstream. In order to study the influence of secondary flow on airflow velocity and different particle sizes of sand particles in a sand sampler, this paper uses a combination of numerical simulation and experimental verification to analyze the flow field characteristics before and after secondary flow is weakened, taking the windsand separator of the shunthedging and multistage expansion sand sampler as the research object. The research results indicate that before secondary flow is weakened, sand with a particle size greater than 0.083 mm are completely collected, while sand with a particle size less than 0.083 mm are mostly collected. After secondary flow is weakened, the distribution range of highspeed airflow becomes larger, and the flow field seems to become unstable. The airflow velocity inside the exhaust pipe significantly increases, and only sand with a particle size greater than 0.12 mm are completely collected, and the range of sand being completely collected is significantly reduced.

Key words: sand sampler, secondary flow, numerical simulation, the windsand separator

摘要: 二次流动是工程实际中普遍存在的物理现象,是一种相对于主流的次要流动。为研究集沙仪内二次流对气流速度、不同粒径的沙尘粒子的影响规律,利用数值模拟和试验验证相结合的方法,以分流对冲与多级扩容式集沙仪的风沙分离器为研究对象,对二次流被削弱前后的流场特性进行分析。研究结果表明:在二次流被削弱前,粒径大于0.083mm的沙尘被完全收集,粒径小于0.083 mm的沙尘被大部分收集;在二次流被削弱后,高速气流分布范围更大,流场似乎变得不稳定,排气管内气流速度明显增高,粒径大于0.12 mm的沙尘才被完全收集,沙尘被完全收集的范围明显缩小。

关键词: 集沙仪, 二次流, 数值模拟, 风沙分离器

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