【摘要】 通过对CTAC溶液的减阻性能的测量,得到了CTAC溶液的减阻性能随伴随盐浓度变化的特性。研究结果表明,即使对同种减阻方式,减阻也存在极限和优选。同时,应用激光相位多普勒测速仪进行减阻流体的湍流特性试验研究,得到了50种工况下流体的速度脉动曲线。研究还发现,减阻流体的横向和轴向速度脉动及雷诺应力明显小于牛顿流体;减阻流体的轴向和横向速度脉动之间的关联被明显抑制。更多还原

【Abstract】 Through the measurement of the drag reducing properties of a CTAC (cetyl trimethyl ammonium chloride) solution obtained were the characteristics of variation of these properties with the change in salt concentration. The results of an investigation indicate that even for one and the same drag reduction mode there exists a limiting value and an optimized selection for drag reduction. Meanwhile, a laser phase Doppler anemometer was employed to investigate the turbulent flow characteristics of a drag reducing fluid and, as a result, speed pulse curves were obtained for 50 kinds of operating conditions. It has also been discovered through the investigation that the transverse and axial speed pulses as well as Reynolds stress of the drag reducing fluid are markedly smaller than those of a Newtonian fluid. The correlation between the axial and transverse speed pulsation of the drag reducing fluid has been conspicuously suppressed.更多还原