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颗粒速度

颗粒速度的相关文献在1991年到2020年内共计109篇,主要集中在化学工业、能源与动力工程、力学 等领域,其中期刊论文58篇、会议论文23篇、专利文献28篇;相关期刊37种,包括太原科技大学学报、兰州理工大学学报、四川理工学院学报(自然科学版)等; 相关会议19种,包括全国第十二届非均相分离学术交流会暨2015厦门台湾两地过滤与分离技术交流大会、第十七届国际热喷涂研讨会暨第十八届全国热喷涂年会(CNTSC`2014)、2013年中国工程热物理学会多相流学术年会等;颗粒速度的相关文献由276位作者贡献,包括卢春喜、金涌、刘梦溪等。

颗粒速度—发文量

期刊论文>

论文:58 占比:53.21%

会议论文>

论文:23 占比:21.10%

专利文献>

论文:28 占比:25.69%

总计:109篇

颗粒速度—发文趋势图

颗粒速度

-研究学者

  • 卢春喜
  • 金涌
  • 刘梦溪
  • 吴诚
  • 成有为
  • 李希
  • 林海波
  • 范怡平
  • 鄂承林
  • 黄卫星
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 边京; 赵凤静; 范怡平; 卢春喜
    • 《石油学报(石油加工)》  | 2018年
    • 摘要: 优化现有的油、剂逆流接触催化裂化提升管进料段结构,将进料喷嘴倾斜向下与内径变化相耦合.通过大型冷模实验装置,考察了在逆流变径耦合催化裂化提升管进料段不同轴向高度,固含率和颗粒速度的径向分布及操作条件对其产生的影响,并分别与前人所用的同径结构内的分布结果进行比较.结果表明,与对应的油、剂逆流接触催化裂化提升管进料段同径结构相比,变径结构进料段内,射流控制区域范围约缩短45.2%,且变径结构进料段内局部固含率分布更加均匀,有利于油、剂两相均匀混合.在实验操作范围内,提高预提升气速和适当提高进料喷嘴气速可使催化剂颗粒在径向分布更加均匀.
    • 钟富建; 曾涛; 刘龙
    • 《矿山机械》  | 2017年
    • 摘要: 试验采用粒子图像测速系统(PIV),研究了循环湍动流化床(C-TFB)在不同静止床层高度、不同操作气速、不同截面高度下颗粒速度分布及变化规律.试验在主体尺寸为2.00 m×0.40 m的C-TFB上进行,采用PIV系统对提升管不同截面高度进行测试,根据试验得到的最终速度矢量图对颗粒的速度进行分析.结果表明:操作气速U0越大,则轴向正方向速度越大,轴向负方向速度减小,说明适当增加U可减少颗粒返混,提高反应器工作效率;静止床层高度Ho的增加对颗粒速度影响较小,而床内物料含量增加,说明C-TFB反应器对物料的处理能力大;不同截面高度的颗粒运动变化差别较大,截面越高颗粒速度越趋于平缓,说明颗粒速度变化特征与提升管的尺寸密切相关.%PIV (Particle Image Velocimetry) system was applied to study the velocity distribution and the variation laws of the particles in the circulating turbulent fluidized bed (C-TFB) at various height of stationary bed,various operating gas velocity and various section height.Test was conducted on the C-TFB whose main body size was 2.00 m × 0.40 m,and PIV system was applied to test the riser at various section height.According to the final velocity vector diagram obtained from the test,the particle velocity was analyzed.The results showed:the greater the operating gas velocity U0 was,the greater the forward axial velocity was and the less the backward axial velocity was,which indicated that appropriate addition of U0 decreased the back mixture of particles so as to enhance the reactor productivity.The increase in the height H0 of stationary bed had slight impact on particle velocity,while the material content in the bed increased,which showed the large processing capacity of the C-TFB reactor.The motion of particles at various section height differed greatly,the higher the section was,the gentler the particle velocity was,which indicated the particle velocity was closely related to the riser dimension.
    • 陈彬; 刘阁
    • 《西南交通大学学报》  | 2017年
    • 摘要: 为了控制油液中颗粒物,降低对设备运行的危害,基于液固两相流的连续介质理论建立了含悬浮颗粒油液的伪均质流数学模型,研究悬浮颗粒油液的动态特性;利用所建模型对不同颗粒浓度情况下油液的速度、压力以及颗粒物的速度、浓度分布进行分析.研究结果表明,特征线法求解结果与实验数据吻合较好;油液速度、压力的跃变幅值随着颗粒浓度增大而减小,颗粒速度、浓度随着浓度的增大而增大;颗粒浓度分布受油液压力影响较大;伪均质流在管路始端、中段、终端发生跃变时刻分别为1/4脉动周期的奇数倍、1/8脉动周期的奇数倍和1/4脉动周期的偶数倍.%To reduce the damage caused by particulate matter to equipment operation and to effectively control the particle concentration in oil, the pseudo-homogeneousz-flow mathematical model of suspended particles in oil was established using the continuum theory of liquid-solid two-phase flow. The dynamic characteristics of the oil containing particles were studied;the oil velocity and pressure and the distribution of particle velocity and concentration were analysed for varying particle concentration using the model. The results showed a good agreement between the experimental data and the results attained by the characteristic line method. The jump amplitude value of oil velocity and pressure decreases with increase in particle concentration;however,the jump amplitude value of particle velocity and concentration increases with increase in particle concentration. The distribution of particle concentration is substantially influenced by the oil pressure. The jump moments of the pseudo-homogeneous flow velocity and pressure take place are 1 / 4 pulsating period odd times ,1 / 8 pulsating period odd number and 1 / 4 pulsating period even times,respectively,at the beginning,middle,and end of the pipeline.
    • 杨新; 陈鸿伟; 梁占伟; 许文良; 孙超
    • 《化工学报》  | 2017年
    • 摘要: 为研究提升管颗粒循环流率对提升管压降的影响,搭建双循环流化床冷态实验系统,采用差压变送器进行提升管轴向区域压降的实验研究.基于提升管不同的颗粒速度计算方法,充分考虑加速区和充分发展区的不同压降机理,建立加速区、充分发展区和整个提升管压降模型,与实验结果比较发现:加速区颗粒速度采用滑移系数方法所得压降与实验值较吻合,在充分发展区进行压降计算时颗粒速度采用滑移速度等于终端速度计算所得结果较精确;在提升管压降计算时可综合考虑加速区和充分发展区适用的压降模型进行计算,可为实际生产运行中采用压差法进行提升管轴向颗粒浓度的分布提供一定参考,为提升管压降的在线监测提供指导.%In order to study effect of particulate circulating flow rate on pressure drop in riser, a cold experiment system of double circulating fluidized bed was established with differential pressure transmitters to probe axial pressure drop in riser. Based on various calculation methods of particulate velocity and different pressure drop mechanisms in different areas, pressure drop models were built for acceleration area, fully developed area, and whole riser. Pressure drop in the acceleration area by slip coefficient calculation was consistent with experimental value, while pressure drop in the fully developed area was relatively accurate upon assuming particulate slip velocity equal to terminal velocity. Therefore, pressure drop calculation in riser by comprehensive pressure drop models in the acceleration and fully developed areas could be good reference for pressure drop to be used in prediction of axial particulate concentration distribution in riser during production and provide guidance for on-line pressure drop monitoring in riser.
    • 孟振亮; 张博峰; 刘梦溪; 王维; 卢春喜
    • 《化学反应工程与工艺》  | 2017年
    • 摘要: 为了考察无导流筒的非强制环流混合器的颗粒混合效率,强化颗粒沿径向的混合效果,采用计算流体动力学(CFD)方法,基于能量最小化多尺度(EMMS)的非均匀化曳力模型模拟研究了非强制环流混合器中的颗粒混合方式及相关流场.模拟结果所示:由于导流筒限制消失,颗粒在中心区与边壁区之间流入与流出,增加了颗粒的混合;在混合器底部(h=0.04 m),颗粒由边壁处向中心处流动,而其他高度,颗粒沿径向向外侧运动;由于中心下料管进料的偏流作用,使得颗粒在上部下降管区及h为0.16 m附近截面产生了明显的沿周向运动.在上部下降管区,边壁区的范围随着表观气速以及轴向高度的增加而减小.模拟结果为环流混合器结构的进一步优化提供了依据.%In order to investigate the particle mixing efficiency of the unforced air loop mixer without draft tube and to enhance the mixing effect of the particles in the radial direction, a computational fluid dynamics (CFD) method was used to simulate the particle mixing modes and the related flow fields based on the energy minimization multi-scale (EMMS) inhomogeneous drag model. The simulation results showed that particles flowed in and out between the central zone and the side wall due to the disappearance of the draft tube, which strengthened the particle mixing. At the bottom of the mixer (h=0.04 m), particles flowed from the side wall to the center, while at the other heights, the particles moved outward along the radial direction. Due to the biased flow of feed to the central feed tube, the cross section of particles in the upper descending zone near h=0.16 m produced a significant circumferential movement. In the upper descending pipe area, the range of the side area decreased with increase of the apparent gas velocity and the axial heights. The simulation results provided the basis for further optimization of the structure of the air-loop mixer.
    • 李成新; 刘森辉; 张惠宇; 李长久; 李露; 黄佳华; 徐攀
    • 《中国表面工程》  | 2019年
    • 摘要: 介绍了一种新型大气等离子喷涂方法,该方法采用特殊内通道结构的直流非转移电弧等离子发生器,可以直接在大气条件下获得长度100~1000 mm之间变化的等离子射流.在大气条件下,等离子射流的流动特性具有“长、直、准”的层流或类层流状态,工作时噪音小于80 dB.在工作参数范围内,等离子射流的长度在固定总气流量条件下可以随输出功率的增加而增长;射流的长度在固定输出功率的条件下随总气流量的增加而减小.当使用在大气等离子喷涂技术中时,会为飞行粉末颗粒带来超长的加热和加速过程.文中详细介绍了大气层流等离子喷涂技术的研究历史和研究现状,以及研究团队利用该新型技术制备的6种涂层的显微结构、颗粒的飞行和加热特点,并对比了目前其他大气等离子喷涂技术的结果.结果 表明,文中介绍的方法在最低的输出功率和气流量条件下,为金属和陶瓷颗粒提供了超长的飞行和加热条件,表现为较低的颗粒飞行速度和超高的颗粒表面温度.可以在不同的射流长度或喷涂距离下,获得不同的颗粒熔化状态或涂层结构,并发现可以直接在大气条件下获得大规模气液共沉积的涂层.
    • 尚灵祎; 吴峰; 马晓迅
    • 《化工学报》  | 2018年
    • 摘要: 针对喷动床内环隙区颗粒缺少横/径向运动的特点,通过实验将纵向涡流发生器及纵向涡流效应引入喷动床.采用粒子图像测速技术研究了在内径为152 mm的喷动床内纵向涡流及颗粒设计参数对喷动床内喷射区及环隙区颗粒相径向速度的影响,研究结果表明,纵向涡发生器在扰流元件上方横截面内颗粒相运动出现大量二次涡流,相比较于无纵向涡流扰流件情况,喷动床内的颗粒径向速度得到了显著增加,表明纵向涡发生器能够增强颗粒相在喷射区及环隙区的径向运动能力.在喷动床稳定喷动范围内,颗粒直径及颗粒密度越小,纵向涡流对颗粒相径向运动的强化效果越佳.
    • 冀宏; 张硕文; 刘新强; 陈晓明; 朱奕
    • 《兰州理工大学学报》  | 2018年
    • 摘要: 针对射流偏转板伺服阀油液中的颗粒在高速射流时对其前置级产生冲蚀磨损的问题,将计算流体动力学和冲蚀磨损理论相结合,对射流偏转板伺服阀前置级进行了数值计算.模拟前置级油液的流动及固体颗粒的运动轨迹,计算了不同直径颗粒的最大运动速度及对前置级冲蚀磨损率的影响,分析了不同偏转板位移、V形导流窗口夹角以及不同偏转板厚度与前置级冲蚀磨损率的关系.结果表明:固体颗粒主要对劈尖冲击发生冲蚀磨损,油液中固体颗粒的直径越大其运动速度越小,但较大直径颗粒对前置级的冲蚀磨损较大;偏转板位移、V形导流窗口夹角以及偏转板厚度增大时前置级冲蚀磨损率减小.
    • 牛方婷; 尚灵祎; 吴峰; 马晓迅
    • 《化学工程》  | 2017年
    • 摘要: The influence of longitudinal vortex generator on the radial velocity of particle phase in cross section of spouted-bed was studied.The Particle Image Velocimetry technology was used to study spouted-bed with 152 mm internal diameter.The effect of shape,diameter and installation spaces of longitudinal vortex generators on radial velocity of the particle phase were investigated.The experimental results show that,the secondary vortex is created near the vortex generator in the spouted bed,and the longitudinal vortex generators enhance the radial velocity of the particle phase.The effect of sphere obstacles installed on the longitudinal vortex generators on strengthen the particle radial movement is better than that of cylindrical obstacles.In addition,there exist most optimal diameter of the sphere and the distance between two spheres,at which the effect of longitudinal vortex generator is best.%探究纵向涡流对喷动床内喷射区及环隙区颗粒相径向速度的影响.采用粒子图像测速技术对内径D=152mm的喷动床进行实验研究,分析对比了不同扰流元件外形,尺寸及安装间距等重要参数对喷动床内颗粒运动的影响.研究结果表明:加入纵向涡发生器后,在扰流元件上方横截面内颗粒相运动出现了大量二次涡流,并且纵向涡发生器增强颗粒相在喷射区及环隙区的径向运动能力.在相同直径尺寸下,球体扰流元件较圆柱体扰流件对喷动床内颗粒径向运动的强化效果更好.存在一个最佳的扰流元件直径及布置间距使得纵向涡流对颗粒径向运动的强化效果达到最佳.
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