A 1:15 3/4 open-jet scaled wind tunnel was used for experimental test. By arranging the synthetic jet actuator around the nozzle, the experimental method was used to analyze the flow field after the active flow control was implemented. The effects of the excitation frequency $f_J$ of different input signals and the excitation velocity $V_0$ of different jet nozzles on the jet shear layer and the flow field in the test section were studied. The obtained results showed that when the excitation frequency of the synthetic jet actuator ($f_J$) was 40 Hz and excitation velocity ${(V}_0)$ equaled to 10 m/s, the turbulence intensity of each measurement point was the highest among all excitation frequencies, and the flow field had a peak near 19–20 Hz, which was the sensitive frequency of buffeting. The highest power spectral density of this frequency peak was nearly ten times higher than the original working condition, which meant that this control scheme will aggravate the buffeting phenomenon. For $f_J$ = 140 Hz and $V_0$ = 15 m/s, it only had a high PSD peak at 19–20 Hz near the measurement point 15 of the collector. The overall control effect of this scheme is better than other schemes. Therefore, it can significantly suppress the buffeting phenomenon of the wind tunnel and improve the flow field quality of the test section.

实验使用了1:15 3/4的开放式比例风洞。通过将合成射流致动器布置在喷嘴周围，在执行主动流量控制后，使用实验方法来分析流场。激励频率的影响$F_{Ĵ}$ 不同的输入信号和激励速度 $V_0$研究了不同射流喷嘴在射流剪切层上的流场和试验区的流场。所得结果表明，当合成射流致动器的激发频率为（$F_{Ĵ}$）为40 Hz，激发速度为 ${（V}_0）$等于10 m / s，每个测量点的湍流强度在所有激发频率中最高，并且流场在19–20 Hz附近有一个峰值，这是抖振的敏感频率。该频率峰值的最高功率谱密度比原始工作条件高出近十倍，这意味着该控制方案将加剧抖振现象。对于$F_{Ĵ}$ = 140 Hz和 $V_0$ = 15 m / s，它仅在收集器的测量点15附近的19-20 Hz处具有较高的PSD峰。该方案的总体控制效果优于其他方案。因此，可以显着抑制风洞的抖振现象，提高测试段的流场质量。