Measurements of Entrainment by Acoustically Pulsed Axisymmetric Air Jets
Measurements of Entrainment by Acoustically Pulsed Axisymmetric Air Jets
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DOI：
10.1115/1.3239933
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发表时间：
1986-06
影响因子：
1.5
通讯作者：
P. Vermeulen;V. Ramesh;W. Yu
中科院分区：
文献类型：
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作者：
P. Vermeulen;V. Ramesh;W. Yu
在一定的小孔尺寸、斯特劳哈尔数和激励功率范围内，对流入周围空气的声脉冲轴对称空气射流的卷吸进行了直接测量。夹带量显著增加，当距离孔口出口平面下游轴向直径大于15直径时，最高可达5.8倍。激射射流的卷吸随下游距离呈线性变化。射流响应随激励强度的变化呈非线性变化，表明卷吸的声学增强可能存在一个实用的上限。响应取决于斯特劳哈尔数，在大约0.25左右似乎是最佳的。
Direct measurements of entrainment by acoustically pulsed axisymmetric air jets flowing into surrounding air have been made for a range of orifice sizes, Strouhal numbers, and excitation powers. The entrainment was considerably increased, by up to 5.8 times at distances greater than 15 diameters axially downstream of the orifice exit plane. The entrainment of the excited jet varied linearly with downstream distance. The jet response varied nonlinearly with excitation strength, indicating that there may be a practical upper limit to the acoustic augmentation of entrainment. The response depends on Strouhal number and appears to be optimum at about 0.25.