锥形改流体下部孔径对筒仓卸料流态的影响

发布时间：2018-04-26 08:54

  本文选题：筒仓 + 模型　； 参考：《农业工程学报》2016年19期

【摘要】：为了获取锥形改流体(cone-in-cone)下部孔径对筒仓内卸料流态和仓壁压力的影响,实现中心流筒仓内物料流态从中心流到整体流的转变,改善筒仓内物料流动环境,建立模型,用试验验证模型是正确的,该文采用离散元法对三维筒仓中ABS球卸料过程进行了数值模拟。数值模拟结果表明:筒仓卸料口尺寸不变时,减小锥形改流体下部孔径,整体流系数增大,筒仓内物料流态能够从中心流转变为整体流,筒仓壁峰值压力减小且峰值压力位置上移。改流体倾角为120°、135°时,当锥形改流体距筒仓锥形壁面的距离与锥形改流体下部孔径的比值大于等于1时,能实现从中心流到整体流的转变。该研究基于数值模拟结果提出了锥形改流体的设计标准,可为工程上确定改流体结构、位置参数提供参考。
[Abstract]:In order to obtain the effect of the lower aperture of cone-cone) on discharge flow and wall pressure in silo, to change the material flow state from center flow to integral flow in central flow silo, to improve the material flow environment in silo, and to establish a model. The method of discrete element is used to simulate the unloading process of ABS ball in three dimensional silo. The numerical simulation results show that when the size of the discharge port of the silo is constant, the lower aperture of the tapered fluid is reduced, the overall flow coefficient increases, and the material flow pattern in the silo can be changed from the central flow to the whole flow. The peak pressure of silo wall decreases and the position of peak pressure moves up. When the inclination angle of the modified fluid is 120 掳/ 135 掳, when the ratio between the distance from the tapered fluid to the tapered wall of the silo and the lower aperture of the tapered modified fluid is greater than or equal to 1, the transition from the center flow to the whole flow can be realized. Based on the numerical simulation results, the design criteria of conical fluid modification are proposed, which can provide a reference for determining the structure and position parameters of the modified fluid in engineering.
【作者单位】： 湘潭大学机械工程学院;华侨大学制造工程研究院;
【分类号】：S229+.3
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本文编号：1805322