管内插螺旋液固两相流流场特征影响因素试验

Experiment on influence factors on flow field characteristics of intercalated spiral liquid-solid two-phase flow in tube

为探究雷诺数、颗粒体积分数和颗粒粒径对内插螺旋液固两相流复合技术流场特征的影响,采用粒子图像处理技术试验研究管内流体涡量、径向速度及湍动能分布规律。结果表明:整体平均涡量、近壁区域平均涡量、径向速度峰值均与雷诺数、颗粒体积分数呈正相关,但与颗粒粒径呈负相关;径向速度均呈正负波动,且近壁区域平均涡量比整体平均涡量增幅大;在试验范围内,Re为33000比Re为26400的平均湍动能提高81.7%,颗粒体积分数为5%比体积分数为1%的平均湍动能提高16.7%,颗粒粒径为1.5 mm比颗粒粒径为5 mm的平均湍动能提高9.83%。

In order to explore the effects of the Reynolds number,the particle volume concentration and the particle size on the flow field characteristics of the intercalated spiral liquid-solid two-phase flow composite technology,the particle image processing technology was used to study the vorticity,the radial velocity and the turbulent kinetic energy distribution of the fluid in the tube.The results show that the average vorticity of the whole system,the average vorticity of the near-wall region and the radial peak velocity are positively correlated with the Reynolds number and particle volume fraction,but negatively correlated with the particle size.The radial velocity fluctuates positively and negatively,and the average vorticity in the near-wall region increases more significantly than the overall average vorticity.In the experimental range,the average turbulent kinetic energy of Re=33000 is increased by 81.7%compared with that when Re=26400,the average turbulent kinetic energy of the particle volume concentration being 5%is increased by 16.7%compared with that being 1%,and the average turbulent kinetic energy of the particle size being 1.5 mm is increased by 9.83%compared with that being 5 mm.