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在Re=3.0×103~1.0×105的范围内实验研究了流线型轴对称钝体尾迹特性,并采用声激励手段对尾迹进行控制.研究表明,自然状态下流线型轴对称钝体尾涡无量纲脱落频率在Re=5.0×104~1.0×105的范围内具有普适性,适当频率的声激励可以减小回流区,该结果对工程减阻具有实际应用价值.实验中脉冲热线的成功应用为复杂流场的测量提供了新的技术手段.
In the range of Re = 3.0 × 103-1.0 × 105, the characteristics of streamlined axial symmetrical bluff bodies were experimentally studied, and the wake was controlled by acoustic excitation. The results show that the natural shedding frequency of axisymmetric bluff-body tail vortex is universal in the range of Re = 5.0 × 104-1.0 × 105. The acoustic excitation with proper frequency can reduce the backflow zone, The result has practical application value for project drag reduction. The successful application of the pulse hotline in the experiment provides a new technical measure for the measurement of complex flow fields.