【摘要】 应用激光相位多普勒测速仪进行减阻流体的湍流特性实验研究,测量了不同减阻工况下的减阻流体的横向速度脉动,得到了多种工况下的速度剖面曲线.在对激光测试结果同减阻性能实验结果进行分析的基础上,对速度剖面曲线的形状与减阻率的关系进行了探讨,并对垂直于流体流动方向的速度脉动与减阻性能的关系进行了研究.将减阻流体和牛顿流体的雷诺应力进行了比较,结果表明减阻流体的雷诺应力显著减小.更多还原

【Abstract】 Phase Doppler anemometry (PDA) was applied to the measuring of the turbulent char-acteristics of drag-reducing fluid, and the mean velocity profiles were gained. The relation be-tween the profile shape and the drag reduction ratio was discussed. The effects of the velocity fluctuations in normai direction on the drag reduction were investigated. The Reynolds stresses of drag-reducing fluid were contrasted with those of Newtonian fluid, which showed that the Reynolds shear stresses of drag-reducing fluid decreased drastically.更多还原