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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Turbulence properties in and around the mixing region of the round jet against current
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Turbulence properties in and around the mixing region of the round jet against current

机译：圆形射流的混合区域和周围的湍流性能抵抗电流

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摘要

This paper shows the spatio-temporal variations of the third-order moment of velocity components, turbulent kinetic energy (TKE) fluxes, and contributions of stress fraction into four quadrants of the total shear stress for an axisymmetric turbulent jet issued into an opposing background flow, in addition to the quiescent background. The comparative analysis of round jet issuing in the quiescent background and against current showed modulation in the third-order moments. This difference reveals that the entrainment of the surrounding fluid decreases due to the background current compared to the jet issuing into the quiescent background. Also, the stream-wise TKE flux propagating opposite to the jet flow signifies that the inertia of the fluid layer actuates a back-off effect within the core region of the jet issued into the quiescent background. On the contrary, this creates an accelerating effect on the fluid streak at all regions for jets issued against the current. Simultaneously, joint probability density function is determined for random velocity time series following Gram-Charlier method which shows almost uniform type distribution at the centerline of the jet. However, near the jet boundary the distribution patterns are altered, which depend upon the jet flow parameters and background conditions. Signatures of kolk-boil phenomena are observed which reveal the interaction of bursting events within the mixing region.
机译：本文介绍了速度分量，湍流动能（TKE）通量的三阶时刻的时空变化，以及应力分数的贡献分为四象限的轴对称湍流喷射到相对的背景流入的轴对称湍流射流除了静止背景之外。静止背景下圆射流发出的比较分析及对电流的三阶矩的调制。这种差异显示，与射流发布到静态背景相比，周围流体的夹带减小了由于背景电流。而且，与射流相反传播的流式TKE通量表示，流体层的惯性致动射流的芯区域内发出的静止背景。相反，这会对抵抗电流发出的喷气机的所有区域产生加速效果。同时，针对革兰克 - 查理机的随机速度时间序列确定联合概率密度函数，其在喷射中心线上表示几乎均匀的类型分布。然而，在喷射边界附近改变分布图案，这取决于喷射流参数和背景条件。观察到Kolk-ob煮沸现象的签名，其揭示了混合区域内爆破事件的相互作用。

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