在开口射流风洞中，采用远场麦克风阵列和粒子图像测速仪（PIV）对等直径三圆柱在不同对称/非对称排列方式下的噪声和流场进行了测试，并通过在圆柱后缘安装实心或多孔分离隔板对噪声进行了控制。实验风速U₀=20~50 m/s，基于圆柱直径D的雷诺数Re_D =2.7×10⁴~6.8×10⁴。噪声测试发现，对称中心排列的三圆柱总声压随中心位置圆柱2的流向位置x/H在区间（-2，+2）呈现波峰与波谷的变化。同一风速下，波峰处（x/H=-1.75）与波谷处（x/H=-1.5或+0.5）的峰值噪声最大差值可达20 dB，且圆柱2位于上游位置（x/H<0）时的波峰区间噪声水平也明显高于下游位置（x/H>0）。圆柱2沿圆柱1、3中心点等周长圆弧上布置时，三圆柱的噪声与流向布置角度变化不明显。控制研究发现，对于中心流向布置的三圆柱，在上游圆柱后缘安装合适分离隔板可以改变流场并抑制噪声。流向位置x/H=-2时，圆柱2后缘采用长度L/D=1或穿孔率σ=18.4%，L/D=2的分离隔板可降低三圆柱噪声12 dB，如继续偏转隔板到β=30°甚至可达20 dB。流向位置x/H=-2时，在圆柱1、3上安装同类型分离隔板。对于L/D=1的实心隔板，平均降噪5 dB，降噪效果不明显。L/D=2、σ=18.2%的分离隔板，随着偏转角度β增大，降噪效果逐渐增强。当偏转角度β≥20°以上时可降低噪声10 dB以上。PIV测试以及POD分析表明，实验中三圆柱布置方式下的噪声主要来自于上游圆柱涡脱落与下游表面上的涡-固干扰，分离隔板噪声抑制的机理是由于其显著抑制了上游圆柱的涡脱落，即抑制了流场中卡门涡街的形成。

The characteristics of noise and flow field of equal-diameter three cylinders in different symmetric/asymmetric arrangements were tested in an open-jet wind tunnel using a far-field microphone array and the Particle Image Velocimeter （PIV）， and the flow field and noise were controlled by installing solid or porous splitter plates at the trailing edges of the cylinders. The experimental wind speed U₀=20–50 m/s， and the Reynolds number Re_D =2.7×10⁴–6.8×10⁴ based on the diameter of the cylinders D. Noise tests revealed that the total sound pressure of the three cylinders arranged in symmetric centers showed a variation of wave peaks and valleys with the streamwise position x/H of the center-positioned Cylinder 2 between （-2， +2）. At the same wind speed， the maximum difference between the peak noise at the wave peak （x/H =-1.75） and the valleys （x/H =-1.5 or +0.5） can be up to 20 dB， and the noise level in the wave peak range at the upstream position （x/H <0） was also significantly higher than that at the downstream position （x/H >0）. When Cylinder 2 was arranged on an arc with the center points of Cylinders 1 and 3， the noise of the three cylinders did not change significantly with the flow arrangement angle. The control study found that for the three cylinders arranged in the central-flow direction， installing an appropriate splitter plate at the trailing edge of the upstream cylinder can change the flow field and suppress the noise. At the streamwise position x/H =-2， installing the splitter plate with length L/D=1 or the perforated plate with perforation σ=18.4% and the splitter plate with length L/D =2 at the trailing edge of Cylinder 2 can reduce the noise of the three cylinders by 12 dB， and the reduction can even reach 20 dB if continuing to deflect the splitter pater to β=30°. However， at the same streamwise position， when the same type of splitter plates was installed on Cylinders 1 and 3， the solid plate with L/D =1 can achieve the average noise reduction of 5 dB， which is not significant； for the perforated splitter with L/D =2 and σ=18.2%， the noise reduction was gradually enhanced with the increase of the deflection angle β； when the deflection angle β≥20°， the noise can be reduced by more than 10 dB. PIV test and POD analysis showed that the noise in the experimental three-cylinder arrangement mainly comes from the vortex shedding of the upstream cylinder and the vortex-solid interaction on the downstream surface， and the mechanism of noise suppression of the splitter plate is due to the significant suppression of the vortex shedding of the upstream cylinder， i.e.， the suppression of the Karmen vortex street in the flow field.