不同角度圆锥冲击射流的噪声特性研究

Noise Characteristics of Impinging Jet on Conical Obstacle With Different Cone Angles

本文针对射流冲击不同角度圆锥体的噪声特性进行了研究。通过声学测量实验获得了总声压级和噪声频谱等声学数据,分析结果表明,锥角对冲击射流噪声特性的影响随着冲击距离的变化而变化。同时,对冲击射流的流场进行了数值模拟,结合流场模拟结果与声场测量结果,对不同冲击距离与圆锥角度下冲击射流的主要噪声源进行了分析。此外,还进行了噪声指向性研究,给出了不同冲击距离、监测点位置及圆锥角度下冲击射流总声压级的分布情况。

In this paper,the noise characteristics of impinging jet on conical obstacle with different cone angles are investigated.Acoustical data such as overall sound pressure level and noise spectrum are obtained by acoustic measurement experiments.The analysis results show that the influence of cone angle on the noise characteristics of impinging jet varies with the change of impinging distance.At the same time,the flow field of the impinging jet is simulated.The main noise sources of the impinging jet with different impinging distances and cone angles are analyzed combined with the simulation results of flow field and experimental results of acoustic field.In addition,the noise directivity of impinging jet is investigated.The distribution of overall sound pressure level of impinging jet is presented with different impinging distance,location of monitoring point and cone angles.