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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Damping insert materials for settling chambers of supersonic wind tunnels
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Damping insert materials for settling chambers of supersonic wind tunnels

机译：用于安装超音速隧道腔室的阻尼插入材料

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摘要

This study describes the application of a novel damping insert material for reducing the flow fluctuations in a tandem nozzle supersonic wind tunnel. This new damping material is composed of multi-layer stainless steel wired meshes. The influences of the multi-layer mesh, such as the quantity of the mesh layer and the installed location in the settling chamber, to the freestream quality have been investigated. A Pitot probe instrumented with a Kulite pressure sensor and a hot-wire probe are employed to monitor the flow fluctuation in the test section of the wind tunnel. Thereafter, a combined modal analysis is applied for the disturbance qualification. Additionally, the transient Mach number in the test section is measured. The disturbance qualification indicates that the multi-layer mesh performs well in providing reduction of vorticity reduction and acoustic fluctuations. Comparable flow quality of the freestream was also obtained using a combination of flexible damping materials. However, the life-span of the new damping materials is much longer. The time transient of the Mach number measured in the test section indicates that the mean flow is rather constant over run time. Furthermore, the time-averaged pressure along the settling chamber is recorded and it shows the distribution of pressure drop by settling chamber inserts.
机译：该研究描述了一种新型阻尼插入材料的应用来减少串联喷嘴超声波风洞中的流量波动。这种新的阻尼材料由多层不锈钢有线网格组成。已经研究了多层网格的影响，例如网格层的数量和安装在沉降室中的安装位置，已经进行了自由流质量。采用具有谨慎压力传感器和热线探针的皮包探针，用于监测风洞的试验部分中的流量波动。此后，施加干扰资格的组合模态分析。另外，测量测试部分中的瞬态马赫数。干扰鉴定表明，多层网格在提供涡流减少和声波的降低方面表现良好。使用柔性阻尼材料的组合也可以获得自由流的可比流量。然而，新阻尼材料的寿命要长得多。在测试部分中测量的马赫数的时间瞬态表明，在运行时平均流量相当恒定。此外，记录沿沉降室的时间平均压力，并显示通过沉降室插入物的压降分布。

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