种子颗粒群的悬浮速度模拟预测方法

发布时间：2018-04-10 01:20

本文选题：种子　切入点：颗粒群　出处：《华南农业大学学报》2016年01期

【摘要】：【目的】模拟预测三七种子颗粒群的悬浮速度,为气固两相流的模拟仿真提供参考依据。【方法】利用PS-20物料漂浮速度试验台测量悬浮速度;采用离散元和计算流体力学相耦合的方法模拟台架试验,并模拟颗粒体积分数对流场影响;借助普拉诺夫斯基修正式验证各体积分数下颗粒群悬浮速度模拟值。【结果】体积分数对流场影响显著。体积分数接近0时,台架试验颗粒群悬浮速度范围为7.14~9.32 m·s-1、平均值为8.23 m·s-1,模拟结果为7.08~9.30 m·s-1、平均值为8.19 m·s-1;当体积分数在2.58%、3.87%、5.16%、7.74%时,模拟试验的悬浮速度分别为8.52、8.72、8.96、9.46 m·s-1,悬浮速度的理论计算值分别为8.53、8.79、9.06、9.71 m·s-1,最大误差为2.6%。【结论】采用模拟技术可建立体积分数低于9.03%时的悬浮速度预测模型;在未出现较大涡流的情况下,可利用离散元和计算流体力学相耦合的方法模拟预测不同体积分数下颗粒群的悬浮速度。
[Abstract]:[objective] to simulate and predict the suspension velocity of panax notoginseng seed particles, and to provide a reference for simulation of gas-solid two-phase flow. [methods] the suspension velocity was measured by PS-20 material floating velocity test rig.The method of discrete element coupled with computational fluid dynamics is used to simulate the bench test, and the effect of particle volume fraction on the flow field is simulated.With the help of Prenovsky's amendment, the simulated velocity of particle group suspension under various volume fractions is officially verified. [results] the volume fraction has a significant effect on the flow field.When the volume fraction is close to 0, the suspension velocity range of the particle group in the bench test is 7.149.32 m ~ (-1), the average is 8.23 m ~ (-1), the simulation result is 7.08 ~ 9.30 m ~ (-1), the average value is 8.19 m ~ (-1), and when the volume fraction is 2.58 ~ 3.87 ~ 5.16, 7.74 ~ (th),The suspension velocity of the simulation test is 8.52 / 8.72 / 8.966 / 9.46ms-1.The theoretical calculation value of the suspension velocity is 8.53 / 8.79 / 9.06ms-1, respectively, and the maximum error is 2.60.Conclusion A model for predicting the suspension velocity with volume fraction lower than 9.03 can be established by using the simulation technique.In the absence of large eddy currents, the discrete element coupled with computational fluid dynamics can be used to simulate and predict the suspension velocity of particle groups with different volume fractions.
【作者单位】：昆明理工大学现代农业工程学院;
【基金】：国家自然科学基金(51305187) 云南省科技计划项目青年项目(2015FD011) 云南省重点新产品开发计划项目(2014BC007) 云南省教育厅科学研究基金(2015Y079) 昆明理工大学自然科学研究基金(KKSY201323067;KKSY201323025;14118940)
【分类号】：O35;S567.236

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