Numerical Studies of a Fluidic Diverter for Flow Control
Numerical Studies of a Fluidic Diverter for Flow Control
复制标题
用于流量控制的流体分流器的数值研究
DOI：
10.2514/6.2009-4012
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. Raghu
中科院分区：
文献类型：
--
作者：
S. Gokoglu;M. Kuczmarski;Dennis E. Culley;S. Raghu
通过时间相关的数值分析，研究了从低亚音速到音速进口条件范围内特定射流转向器的内部流动结构。这种理解将有助于开发具有最小压力损失的流体分流器和先进的流量控制执行器设计。计算了亚音速条件下的速度场、温度场和压力场，并成功地预测了流动的自激振荡行为。我们的数值研究结果与我们的振荡频率的实验测量有很好的一致性。在气体介质中的声速被确定为是一个关键因素，在管理发起振荡的机制，以及确定其频率的声波条件。采用等离子体致动与最小的扰动水平的可行性证明在稳态计算中也产生振荡频率的我们自己的选择，而不是依赖于固定的几何形状的流体装置。
The internal flow structure in a specific fluidic diverter is studied over a range from low subsonic to sonic inlet conditions by a time-dependent numerical analysis. The understanding will aid in the development of fluidic diverters with minimum pressure losses and advanced designs of flow control actuators. The velocity, temperature and pressure fields are calculated for subsonic conditions and the self-induced oscillatory behavior of the flow is successfully predicted. The results of our numerical studies have excellent agreement with our experimental measurements of oscillation frequencies. The acoustic speed in the gaseous medium is determined to be a key factor for up to sonic conditions in governing the mechanism of initiating the oscillations as well as determining its frequency. The feasibility of employing plasma actuation with a minimal perturbation level is demonstrated in steadystate calculations to also produce oscillation frequencies of our own choosing instead of being dependent on the fixed-geometry fluidic device.