基于不同储粮品种的双层浅圆仓中心卸料动压力分析

    Analysis of dynamic pressure during central discharging in double-storey squat silo for different grain storage varieties

    • 摘要: 双层浅圆仓作为一种新的粮食储藏结构,具有节约用地、节能减碳等优势,能有效保证储粮品质。为研究储粮品种对双层浅圆仓中心卸料的影响,采用离散元方法构建了双层浅圆仓中心卸料动压力的数值分析模型,并以大豆、玉米、稻谷、小麦为研究对象,分析了不同贮料颗粒对双层浅圆仓中心卸料动压力的影响;采用灰色关联度方法对中心卸料动压力的影响因素进行了分析。结果表明:小麦和稻谷在进行卸料时呈现漏斗状流动,卸料动压力震荡幅度较小;大豆和玉米的卸料则呈现整体流动趋势,卸料动压力在连续震荡中逐渐减小;稻谷和小麦卸料口两侧的颗粒速度分布呈现明显的竖向分层现象,颗粒速度由上到下呈逐渐增大的趋势,而大豆和玉米颗粒速度分布则不规则;双层浅圆仓卸料过程中,动压力与滚动摩擦系数、与仓体滚动摩擦系数、静摩擦系数的关联度较大,关联度在0.8以上。本研究可为双层浅圆仓的结构分析提供理论支持,有助于其推广应用。

       

      Abstract: As a new grain storage structure, the double-story squat silo (DSSS) ensures the quality of grain storage and offers the advantages of land saving, energy saving and carbon reduction, etc. In this paper, a discrete element approach was used and a numerical analysis model for the center discharge of DSSS was constructed. Research objects of soybean, corn, rice and wheat were used to investigate the effect of different storage particles on the dynamic pressure of discharging at the center of DSSS, and the grey relational analysis method was also used to investigate the influencing factors of the dynamic pressure of the central discharge. The results firstly showed that wheat and rice present a funnel-shaped flow when discharging, and the amplitude of the discharging dynamic pressure oscillation is smaller. The unloading of soybean and corn showed an overall flow trend, and the discharging dynamic pressure show a trend of decreasing in continuous oscillation. Secondly, the particle velocity above the discharging port of rice and wheat was greater than the particle velocity on both sides, and the particle velocity distribution on both sides of the discharging port showed an obvious vertical stratification phenomenon, with each layer showing a gradual increase in particle velocity from top to bottom, while the distribution of particle velocity of soybean and maize showed a more irregular distribution. Thirdly, It was concluded that during the discharging process of DSSS, the dynamic pressure was greatly correlated with the rolling friction coefficient of the particle, the rolling friction coefficient between the silo body and the particle, the static friction coefficient of the particle, the correlation values were all above 0.8. This paper provides a theoretical guidance and technical support for the structural analysis of DSSS, which has important engineering application value and helps to promote the application of DSSS.

       

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