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首页> 外文会议>International Conference on Fluid Mechanics; 20040720-30; Dalian(CN) >MIXING INDICATORS OF LOBE FORCED MIXER FLOW
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MIXING INDICATORS OF LOBE FORCED MIXER FLOW

机译：叶片强制混合器流量的混合指标

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摘要

In the present experimental investigation the characteristics of two types of vortices, namely the normal Kelvin-Helmholtz and streamwise vortices, generated in the near wake of single-lobe forced mixer have been examined and evaluated at two velocity ratios, i. e., r =U_1/U_2 =1:1 and 0.4:1. The single-lobe mixer was designed to eliminate the interaction between the neighboring vortices generated by the adjacent lobes. Hot-Wire Anemometer was used to study the Kelvin-Helmholtz vortices, using spectrum analysis; while Laser Doppler Anemometer was employed to study the streamwise vortices. It was found that there were two main frequencies for the Kelvin-Helmholtz vortex in the wake of the lobe forced mixer; and both of them were higher than the case of plane free shear layer. For the single-lobe forced mixer flow, the Strouhal Numbers increase with the Reynolds Number while increasing the velocity ratios cause the Strouhal Number to decrease gradually. Consequently the Strouhal Numbers would reach certain stable values at high Reynolds Number. The initial mean streamwise vorticity and the subsequent decay were almost the same for the two velocity ratios.
机译：在本实验研究中，已经检查和评估了在单瓣强制混合器近尾产生的两种类型涡旋的特性，即正常开尔文-亥姆霍兹涡流和沿流涡旋的特性，并以两种速度比进行了评估。例如，r = U_1 / U_2 = 1：1和0.4：1。单瓣混合器的设计消除了相邻瓣产生的相邻涡之间的相互作用。使用热线风速计通过频谱分析研究开尔文-亥姆霍兹旋涡。激光多普勒风速仪用于研究流向旋涡。发现在波瓣强制混合器之后，开尔文-海姆霍兹涡流有两个主要频率；两者均高于平面自由剪切层的情况。对于单瓣强制混合器流量，斯特劳哈尔数随雷诺数而增加，而速度比的增加导致斯特劳哈尔数逐渐减小。因此，在高雷诺数下，斯特劳哈尔数将达到某些稳定值。对于两个速度比，初始平均流向涡度和随后的衰减几乎相同。

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