仿生导流叶片管路降噪特性研究

Noise reduction characteristics of bionic guide vane pipelines

本文基于仿生技术对导流叶片进行再设计,研究其降噪特性。基于水管路系统实验平台,对带导流叶片管路进行实验研究和仿真计算,验证了LES/Lighthill的混合计算方法的可靠性;采用混合计算方法对不同流速下带仿生导流叶片的管路进行流场及声场计算,揭示导流叶片仿生设计对管路流场及声场的影响机理。结果表明:仿生设计后的导流叶片可以有效抑制尾部及壁面涡的产生,从而抑制流噪声;不同流速下的降噪效果不同,其中在2 m/s流速下效果最佳;在计算频段内,2 m/s流速下降噪效果最稳定。这些发现为导流叶片的仿生设计在噪音控制领域的应用提供了重要的参考和指导。

In this paper,we redesigned the guide vane based on bionic technology and studied its noise reduction characteristics.Then,based on the experimental platform of the water piping system,we verified the reliability of the LES/Lighthill hybrid calculation method by conducting experimental research and simulation calculation of the pipeline with guide vanes.The hybrid calculation method was used to calculate the flow field and sound field of pipelines with bionic guide vanes at different flow speeds,thus revealing the influence mechanism of the bionic guide vane on the pipeline flow field and sound field.The results indicated that the bionic guide vane can effectively suppress the generation of tail and wall vortices,thereby suppressing flow noise.Furthermore,the noise reduction effect varied under different flow speeds,with the best effect observed at less than 2 m/s flow velocity.Meanwhile,in the calculation frequency band,the most stable noise reduction effect was observed at the flow velocity of 2 m/s.These findings provide valuable insights and guidance for the application of biomimetic diffuser blade design in the field of noise control.