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首页> 外文期刊>International Journal of Heat and Fluid Flow >Numerical investigation of plasma-controlled turbulent jets for mixing enhancement
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Numerical investigation of plasma-controlled turbulent jets for mixing enhancement

机译：等离子控制湍流射流增强混合的数值研究

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Plasma-controlled turbulent jets are investigated by means of Implicit Large Eddy Simulations at a Reynolds number equal to 460,000 (based on the diameter of the jet and the centreline velocity at the nozzle exit). Eight Dielectric Barrier Discharge (DBD) plasma actuators located just before the nozzle exit are used as an active control device with the aim to enhance the mixing of the jet. Four control configurations are presented in this numerical study as well as a reference case with no control and a tripping case where a random forcing is used to destabilize the nozzle boundary layer. Visualisations of the different cases and time-averaged statistics for the different controlled cases are showing strong modifications of the vortex structures downstream of the nozzle exit, with a substantial reduction of the potential core, an increase of the jet radial expansion and an improvement of the mixing properties of the flow.
机译：等离子控制的湍流射流通过隐性大涡模拟进行研究，其雷诺数等于460,000（基于射流的直径和喷嘴出口的中心线速度）。位于喷嘴出口前的八个电介质阻挡放电（DBD）等离子体致动器用作主动控制设备，目的是增强射流的混合。在此数值研究中介绍了四种控制配置，以及无控制的参考案例和使用随机强制使喷嘴边界层不稳定的跳闸案例。对不同情况的可视化以及对不同受控情况的时间平均统计数据显示，喷嘴出口下游的涡流结构发生了强烈的变化，潜在的岩心显着减少，射流径向膨胀增加，而射流径向改善。流的混合特性。

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