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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Simulation of Axisymmetric Jet Issuing from a Nozzle with Collar
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Simulation of Axisymmetric Jet Issuing from a Nozzle with Collar

机译：带有颈圈的喷嘴对轴对称射流的模拟

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摘要

The evolution of a round turbulent jet issuing from a nozzle with a collar is simulated by using a discrete vortex method under the constraint of axial symmetry. The vortex sheets shed from the nozzle and the edge of the collar are represented by vortex ring elements. The collar is represented by vortex rings of appropriate strengths to satisfy the no-through-flow condition. The effect of the collar on the development of the jet shear layer is investigated with and without harmonic excitation. When harmonic excitation in the range of St = 0.3 to 0.7 is applied to the model jet issuing from a nozzle without a collar, large-eddy structures corresponding to the frequency of the excitation are formed. When St ≧ 0.5, these eddies coalesce immediately and are converted into eddies of St/2. The evolution of the jet shear layer is greatly affected by the collar. The preferred frequency varies with the dimensions of the collar.
机译：在轴向对称性的约束下，采用离散涡旋方法模拟了从带颈喷嘴产生的圆形湍流射流的演变过程。从喷嘴和套环的边缘流下的涡流片由涡流环元件表示。套环由具有适当强度的涡流环表示，以满足不流通的条件。在有和没有谐波激励的情况下，研究了套环对射流剪切层发展的影响。当将St = 0.3到0.7范围内的谐波激励应用于从无轴环的喷嘴发出的模型射流时，会形成与激励频率相对应的大涡结构。当St≥0.5时，这些涡旋立即聚结，并转换为St / 2的涡旋。颈圈极大地影响了射流剪切层的演化。优选的频率随轴环的尺寸而变化。

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