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On Evolution of Flow Structure and Vortex Dynamics for Right-Angle and Sharp-Edged Orifice Plane Jet

机译:直角和尖角孔口平面射流的流动结构和涡旋动力学的演变

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摘要

The dynamics of flow structures in the near field of orifice plane jets with sharp-edged and right-angle exit profiles are studied experimentally. The operating velocities of the jet flow are within U_0 = 5-20 m/s. Test results show that the evolution of the jet flow is significantly influenced by the initial orifice exit profiles. The initial fluctuating velocities of orifice plane jets are higher than the case of contoured nozzle plane jets. The vena contracta effect plays a crucial role in the flow development of the orifice plane jet. The length of potential core, mixing characteristics and turbulence properties are also extensively investigated in this paper. The energy transfer characteristics can be aptly characterized by the evolution of coherent structures. The kinetic energy gained at the immediate orifice exit is contributed to by mean energy advection. The fluctuation kinetic energy implants into the turbulent flow through turbulent energy advection at the vortex merging process because no positive value for turbulent energy production is observed there.
机译:实验研究了具有尖锐边缘和直角出口轮廓的孔口平面射流近场中的流动结构动力学。射流的工作速度在U_0 = 5-20 m / s之内。测试结果表明,射流的演变受到初始孔口出口轮廓的显着影响。孔口平面射流的初始波动速度高于轮廓喷嘴平面射流的情况。静脉收缩效应在孔口平面射流的流动发展中起着至关重要的作用。本文还对潜在核的长度,混合特性和湍流特性进行了广泛的研究。能量传递特性可以通过相干结构的演化来恰当地表征。在平均孔口平流作用下,在孔口出口处获得的动能。波动动能在涡流合并过程中通过湍流能量平流注入湍流中,因为在那里未观察到产生湍流能量的正值。

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