摘要
采用层流模型对内置同心双螺旋扭旋元件的管内流动特性进行了数值模拟分析,得到了螺旋流场的演化规律、元件宽度比对螺旋流和流动阻力的影响规律以及雷诺数对螺旋流半径和流动阻力的影响关系.结果表明:流体在扭旋元件长度范围内,在扭旋元件的影响下形成与相应扭旋片旋向相同的主螺旋涡流,在内扭旋片径向端面形成两个与内扭旋片旋向相反的次螺旋涡流;流体质点螺旋流半径经历了一个由大、小、大的变化过程,流体径向流动增强,强化流体流动效果;在较小的雷诺数(Re=100~1100)下,元件宽度比R对流体流动有较大影响,在R=1结构下流体径向流动效果最好;元件宽度比R对压力降和摩擦系数影响较小,说明迎流面积不变的情况下,扭旋元件的形体阻力和摩擦阻力几乎保持不变.
The flow characteristics of the novel concentric double twisted element are numerically simulated by using laminar flow model.The evolution law of spiral flow field,the influence of element width ratio on spiral flow and flow resistance,and the influence of Reynolds number on spiral flow radius and flow resistance are obtained.The results show that in the length range of the twisted element,the fluid forms a main spiral vortex under the influence of the twisting element,and the radial end surface of the inner twisting piece forms two secondary spiral eddy current opposite directions to the inner twisting piece.The fluid particle spiral flow radius undergoes a larg-small-large change process,the fluid radial flow is enhanced,and the fluid flow effect is enhanced.Under the smaller Reynolds number(Re=100~1100),the component width ratio R has a great influence on the fluid flow,the radial flow effect of the fluid is the best under the R=1.The element width ratio R has lttle effect on the pressure drop,indicating that the body resistance and frictional resistance of the twisted element remain almost unchanged in the case of the constant flow area.
作者
张春梅
信东明
王宗勇
丁桂彬
ZHANG Chun-mei;XIN Dong-ming;WANG Zong-yong;DING Gui-bin(School of Energy and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《应用化工》
CAS
CSCD
北大核心
2020年第S01期1-5,11,共6页
Applied Chemical Industry
基金
国家自然科学基金项目(51506133,51406125)
关键词
数值模拟
扭旋元件
螺旋流
流动阻力
宽度比
numerical simulation
twisted element
helical flow
flow resistance
width ratio
