Subsonic jet noise reduction by fluidic control: The interaction region and the global effect
Subsonic jet noise reduction by fluidic control: The interaction region and the global effect
复制标题
通过流体控制降低亚音速射流噪声：相互作用区域和全局效应
DOI：
10.1063/1.3006424
复制
发表时间：
2008
影响因子：
4.6
通讯作者：
E. Lamballais
中科院分区：
文献类型：
--
作者：
E. Laurendeau;P. Jordan;J. Bonnet;J. Delville;P. Parnaudeau;E. Lamballais
一种包括穿透（或浸没）和汇聚（射流定向使得一对射流中的两个射流相互作用）的微射流布置用于控制亚音速湍流射流，以降低噪声。就降噪而言，所谓流控系统的声学效果可与线形和非会聚微射流相媲美。对马赫数为0.3、雷诺数为31万的主射流进行了详细的实验测量。利用浸入边界法对平面混合层问题模型进行了直接数值模拟研究，以帮助理解流控器-混合层相互作用的拓扑特征。在流动中产生的变化方面，确定了两个相对不同的区域：近喷嘴区域，在这里，射流恢复了许多不受控制的射流。
A microjet arrangement comprising both penetration (or immersion) and convergence (jets oriented such that two jets of a pair interact with one another) is used to control a subsonic turbulent jet with a view to noise reduction. The acoustic effect of the so-called fluidevron system is comparable to chevrons and nonconverging microjets as far as the noise reduction is concerned. Detailed experimental measurements are performed for a main jet with Mach and Reynolds numbers of 0.3 and 310 000, respectively. A direct numerical simulation study is performed for a model, plane mixing-layer problem using the immersed-boundary method, in order to help understand the topological features of the fluidevron–mixing-layer interaction. In terms of modifications produced in the flow, two relatively distinct regions are identified: the near-nozzle region, 0 1, where the jet recovers many of the uncontrolled-jet flow ch...