粉尘密度对20L球罐内粉尘分散规律影响

发布时间：2018-08-08 13:10

【摘要】：为分析不同粉尘因密度的差异对20 L球形爆炸装置球罐内粉尘分散过程流场变量变化和点火延迟时间的影响,利用CFD数值模拟的方法,研究了3种不同密度的粉尘在球罐分散过程中湍流动能、流场速度、粉尘浓度3种流场变量在球心处的变化规律。研究结果表明:在其他条件一致的情况下,粉尘密度越小,湍流动能的峰值越小,粉尘云浓度和流场速度的峰值则越大;粉尘密度对湍流动能的增值速率没有影响,而粉尘密度越小,流场速度和粉尘浓度的增值速率越快,粉尘浓度衰减至稳定值的时间也越短。表明粉尘密度越小,点火延迟时间也越小,因此,建议铝粉点火延迟时间在50~60 ms之间,锆粉和锌粉在60~80 ms之间。
[Abstract]:In order to analyze the influence of different dust density on the variation of flow field variables and ignition delay time during dust dispersion in a 20L spherical explosive device, the CFD numerical simulation method was used. The variations of turbulent kinetic energy, velocity of flow field and dust concentration in the spherical center of three kinds of dust with different densities in the spherical tank were studied. The results show that under the same conditions, the smaller the dust density is, the smaller the peak value of turbulent kinetic energy is, and the greater the peak value of dust cloud concentration and flow velocity is, and the dust density has no effect on the increase rate of turbulent kinetic energy. The smaller the dust density, the faster the velocity of flow field and the increment rate of dust concentration, and the shorter the time of dust concentration decay to stable value. The lower the dust density, the smaller the ignition delay time. Therefore, it is suggested that the ignition delay time of aluminum powder is between 50 ~ 60 Ms, and that of zirconium powder and zinc powder is between 60 ~ 80 Ms.
【作者单位】：重庆科技学院安全工程学院;
【基金】：国家安监总局2017年安全生产重大事故防治关键技术科技项目(chongqing-0003-2017AQ) 重庆科技学院研究生科技创新计划项目(YKJCX1620713;YKJCX1620721);重庆科技学院安全工程学院学生科技创新项目(2015207012)
【分类号】：X932

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