The dynamic characteristics of the gas flow field in a reverse cyclone were investigated experimentally in this study by measuring instantaneous tangential velocity with hot wire anemometry (HWA). The instantaneous tangential velocity was found to continuously fluctuate by both low and high frequencies with time. Further analyses of measured data regarding time and frequency domains by standard deviation and spectral analysis revealed that the fluctuation intensities were stronger in the center region than that near the wall, and stronger still near the dust outlet. One dominant frequency (f₁) prevailed in entire space of the cyclone and remained almost unchanged, while the power spectral density (PSD) of f₁ decreased significantly with increased radial position. To this effect, the low-frequency velocity fluctuation exhibited transfer behavior and attenuation characteristics. Besides, another dominant frequency (f₂) generated by the hopper (the hopper led to a new fluctuation) and emerged just in the local region of the dust outlet. Analyses suggested that both dominant frequencies originated from the sway of the gas swirling flow, f₁ was from the cyclone, and f₂ from the hopper. The dominant frequencies also increased as Re increased, and in the cyclone with a hopper, the region affected by f₂ grew in size as Re increased.

通过热线风速仪（HWA）测量瞬时切向速度，通过实验研究了反向旋风分离器中气流场的动态特性。发现瞬时切向速度随着时间的流逝而在低频和高频下连续波动。通过标准偏差和频谱分析对时域和频域的测量数据进行进一步分析，结果表明，中心区域的波动强度比壁附近的波动强度更大，而粉尘出口附近的波动强度仍然更大。在旋风分离器的整个空间中占主导地位的频率（f ₁）几乎保持不变，而f ₁的功率谱密度（PSD）随着径向位置的增加而显着降低。为此，低频速度波动表现出传递行为和衰减特性。此外，料斗产生的另一个主频（f ₂）（料斗导致了新的波动），并刚好出现在粉尘出口的局部区域。分析表明，两个主频均来自气体旋流的摇摆，f ₁来自旋风分离器，f ₂来自料斗。主频率也随Re的增加而增加，在带有漏斗的旋风分离器中，受f ₂影响的区域随Re的增加而增大。