Experimental characterization of the transonic test section flow in a Ludwieg tube

Experimental characterization of the transonic test section flow in a Ludwieg tube
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路德维格管中跨音速测试段流动的实验表征

DOI:
10.1016/j.ast.2018.05.038
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发表时间:
2018
影响因子:
5.6
通讯作者:
Olivier H.
Olivier H.
中科院分区:
工程技术1区
文献类型:
--
作者:
Hammer B;Olivier H.

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一个新的用于跨音速试验的路德维希管已经投入使用。为此,现有的激波管已被修改为路德维希管。通过理论描述了理想的工作原理,并将相应的理论值与实验值进行了比较。压力历史以及试验段流场显示表明,与以前的激波管相比,该激波管在流动质量和试验时间方面具有更好的性能。在试验段内进行了静态和总压测量。皮托管倾角测量显示了试验段流场的均匀性。附加的边界层剖面测量给出了试验段壁边界层随时间增长的证据。这些结果进行了比较,从理论推导出的膨胀波后面的边界层的理论方法。边界层和皮托管倾角测量都允许讨论湍流边界层对这些测量的影响。试验段入口处的饼干切割器作为边界层排放,部分避免管壁边界层进入试验段。并讨论了它们对试验段水流的影响。
A new Ludwieg tube for transonic testing has been put into operation. For this, an existing shock tube has been modified to a Ludwieg tube. The ideal operating principle is described by theory and corresponding theoretical values are compared to experimental ones. Pressure histories as well as test section flow visualization demonstrate a better performance concerning flow quality and testing time compared to the former shock tube. Static as well as total pressure measurements have been performed within the test section. Pitot rake measurements show the homogeneity of the test section flow field. Additional boundary layer profile measurements give evidence of the temporal growth of the test section wall boundary layer. These results are compared with theoretical ones deduced from a theoretical approach for a boundary layer behind an expansion wave. Both, boundary layer and Pitot rake measurements allow to discuss the influence of a turbulent boundary layer on these measurements. Cookie cutters at the entrance to the test section act as boundary layer bleed which partially avoid the entering of the tube wall boundary layer into the test section. Their influence on the test section flow is discussed as well.
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