声衬流动声性能测量的流管实验装置设计及调试

Design and Adjustment of Flow Duct Facility for Acoustic Liner Measurement

管道风扇声衬优化设计的重要环节是实验验证所设计的声衬结构在设计的流动工况下能否具有所要求的声学性能,本文回顾了验证实验装置流管设备的发展历史,介绍了北京航空航天大学所建立的流管装置的结构和工作原理,以及初步的调试,实验说明工作段流场均匀,无流动的声场满足波导管理论,初步调试表明该装置基本满足设计要求,调试是初步的,有、无流动条件的管口的声阻抗测量及其它有关流管的实验研究还有待进一步进行。

An important problem in the liAbstract.An important problem in liner optimization of ducted fan is to verify whether a designed liner construct possess the desired acoustical properties at presence of flow by experiment. The paper reviews the development of flow ducts facility,introduces the flow ducts facility built up in BUAA,and its configuration,operating principle and an initial test. It shows the flow is uniform in the test section,the sound field without inflow obey the rule of guided duct theory ,all of that illustrate the facility satisfy the request for the device fundamentally. The test is only initial ,further work for the impedance measurement of the terminals either with flow or without flow and other experimental research works about flow duct facility will be continued.