An experimental study of pulsating turbulent flow in a pipe
An experimental study of pulsating turbulent flow in a pipe
复制标题
DOI：
10.1016/j.euromechflu.2008.05.004
复制
发表时间：
2009-03-01
影响因子：
2.6
通讯作者：
Jackson, J. D.
中科院分区：
文献类型：
--
作者：
He, S.;Jackson, J. D.
本文报道了用双分量激光多普勒测速系统测量脉动湍流瞬时速度的实验研究。由测量结果得到了整体平均轴向速度的局部值以及均方根湍流速度脉动的径向和轴向分量。施加的流速脉动的频率在宽范围内系统地变化，该宽范围覆盖从0.004至0.04的内标度无量纲频率ω v/u（r）（2）。就外标度频率ω D/u（T）而言，相应的值从1.8变化到18。此外，还研究了改变平均流量和流量脉动幅度的影响。径向分布的整体平均轴向速度和RMS湍流脉动的轴向和径向分量的调制的幅度，以及它们的相移相对于施加的流量脉动，提出的条件，其中包括低，中，高频率范围。这些增加和加强了从早期实验工作中获得的信息，并使在评估和验证用于关联这些数据的方法方面取得了有益的进展。通过将所观察到的行为与湍流产生的基本过程、湍流能量在其分量之间的重新分配以及湍流的径向传播联系起来，对结果有了很好的理解。(C)2008年，Elsevier Masson SAS。All rights reserved.
An experimental study of pulsating turbulent flow in a pipe is reported in which measurements of instantaneous velocity were made using a two-component Laser Doppler Anemometer system. Local Values of ensemble-averaged axial velocity, and radial and axial components of root-mean-square turbulent velocity fluctuation were obtained from the measurements. The frequency of the imposed pulsation of flow rate was varied systematically over a wide range covering inner scale dimensionless frequency omega v/u(r)(2) from 0.004 to 0.04. In terms of outer scale frequency omega D/u(T) the corresponding values varied from 1.8 to 18. In addition, effects of changing the mean flow rate and the amplitude of flow rate pulsation were studied. Radial distributions of the amplitude of the modulation of ensemble-averaged axial velocity and the axial and radial components of RMS turbulent fluctuation, and their phase shifts relative to the imposed flow pulsation, are presented for conditions which include the low, intermediate and high frequency ranges. These add to and reinforce the body of information available from earlier experimental work and have enabled useful progress to be made in evaluating and validating approaches used for correlating such data. By relating observed behaviour to the fundamental processes of turbulence production, redistribution of turbulence energy between its components and radial propagation of turbulence, a good understanding of the results has been obtained. (C) 2008 Elsevier Masson SAS. All rights reserved.