摘要
采用阻尼网数值模型和改进的延迟脱落涡(IDDES)湍流模拟方法,计算了阻尼网用于控制圆柱流动和噪声的场景,研究了阻尼网的控制机理和规律。计算中,阻尼网呈圆弧形,放置于圆柱之前,探索了不同开孔率的影响。阻尼网能够通过影响圆柱的分离区和涡脱特性来影响振动和噪声辐射。开孔率为0.55时,阻尼网可以消除由圆柱涡脱引起的主导频率振动,极大降低下游尾迹区的湍流脉动,无量纲湍动能最大值从0.19降到0.09。在远场噪声方面,该阻尼网能在90°方向降低总声压级3.5 dB。
Screens applied to circle cylinder for flow and noise control were studied by a screen model and the improved delayed detached eddy simulation(IDDES)method.The screens were curved and located before the cylinder as a shroud.Different porosities were simulated to investigate the control mechanism.The screen with porosity of 0.55 could suppress the vortex induced vibration(VIV)and reduce the far-field noise by managing the flow separation and vortex shedding.The maximum of non-dimensional turbulent kinetic energy was reduced from 0.19 of baseline to 0.09.At the same time,far-field noise at 90°could be reduced by 3.5 dB due to the presence of screen.
作者
朱文庆
仲唯贵
ZHU Wenqing;ZHONG Weigui(China Helicopter Research and Development Institute,Jingdezhen 333001,China)
出处
《直升机技术》
2022年第1期1-7,共7页
Helicopter Technique
