【摘要】 用两个X型热膜探针对内径为35mm的水平管内气液两相泡状流的三维紊流结构进行了准三维测量,得出了沿不同直径的轴向、径向和周向的紊流脉动速度和雷诺应力分布。发现在水平管下部脉动速度和雷诺应力与单相流动时的分布规律相似;在管子上部由于空气泡的存在增强了脉动速度;在某些区域内,周向的脉动值甚至比径向和轴向的相应值还要高。水平气液两相泡状流中雷诺应力-uw不为零,在管子的上部甚至和-uv有相同的量级。给出了由于气泡引起的紊流脉动与总素流脉动比值沿径向的分布。更多还原

【Abstract】 Measurements of 3-D turbulence structure of air-water bubbly flow in a horizontal tube with 35mm ID were implemented using two TSI X-type hot-film probes, and turbulent fluctuations and Reynolds stresses were obtained in different diametrical directions. It is found that in the lower portion of the tube, the profiles of turbulent fluctuation and Reynolds stresses resemble those of single phase flow; and in the upper portion of the tube the turbulence is substantially enhanced due to large population of bubbles congregated there; the circumferential turbulence is even higher than those in axial and radial, directions in certain region of the upper portion of the tube. Being different from those in single phase flow and vertical air-water bubbly flow in which the Reynolds stress -uw is zero due to the symmetric velocity distribution, the magnitudes of Reynolds stress -uw and -uv are found to be in the same level except in the lower portion of the tube where - uw is close to zero. The ratio of bubble-induced turbulence to total turbulence is also given.更多还原