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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Helical Instability Wave Excitation in Swirling Jets by a Novel Mechanical Device
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Helical Instability Wave Excitation in Swirling Jets by a Novel Mechanical Device

机译：新型机械装置在旋流喷射中激发螺旋不稳定性波

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摘要

The purpose of this investigation is to explore the possibility of using artificial mechanical means for excitation of shear layers with application in swirling jet mixing enhancement. For this purpose, a novel mechanical device for excitation of the helical instabilities of swirling jets is designed, fabricated, and used in these experiments. The device consists of a rotating cylinder with internal lobes of small height to induce small perturbations. The number of lobes and the direction of rotation can be varied to induce helical waves at az-imuthal wave numbers of m = +0, ±1, ±2, ±3, and +4. The m = +0 denotes the plane-wave excitation, m = ± 1 identifies the first helical mode with one lobe, m = ±2 is the second helical wave with two lobes and so on. The positive and negative signs imply helical perturbation waves that spin in the same or opposite direction to the swirl direction, respectively. Swirl is induced in the airflow by a 45° vane-type swirl generator. Time mean axial velocity and turbulence measurements of the swirling jet, with and without excitation, are measured by hot-wire anemometer. The results are compared with the baseline (plane-wave excitation) at various helical modes. The acquired data is presented in 3D mesh plots and 2D contour plots. It is observed that new device is effective in excitation of the helical instability waves and in mixing enhancement of the swirling jet.
机译：这项研究的目的是探索使用人工机械方法激发剪切层并在涡流喷射混合增强中的应用。为此，设计，制造了一种新颖的机械装置，用于激发旋流的螺旋不稳定性，并在这些实验中使用了该装置。该设备由一个旋转圆柱体组成，该圆柱体的内部凸角较小，可引起较小的扰动。可以改变波瓣的数量和旋转方向，以在m = + 0，±1，±2，±3和+4的z角波数处感应螺旋波。 m = +0表示平面波激励，m =±1表示具有一个波瓣的第一螺旋模，m =±2是具有两个波瓣的第二螺旋波，依此类推。正号和负号表示分别以与旋流方向相同或相反的方向旋转的螺旋摄动波。 45°叶片式涡流发生器在气流中引起旋流。用热线风速仪测量在有或没有激励的情况下旋流射流的时间平均轴向速度和湍流测量值。将结果与各种螺旋模式下的基线（平面波激发）进行比较。采集的数据以3D网格图和2D轮廓图显示。可以看出，新装置在激发螺旋不稳定性波和增强旋流喷射的混合效率方面是有效的。

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