Boundary-layer stabilization by an ultrasonically absorptive material on a cone in hypersonic flow: numerical investigations

被引：6

作者：

Wartemann, Viola ^{[1
]}

Wagner, Alexander ^{[2
]}

Giese, Tobias ^{[1
]}

Eggers, Thino ^{[1
]}

Hannemann, Klaus ^{[2
]}

机构：

[1] German Aerosp Ctr DLR, Braunschweig, Germany

[2] German Aerosp Ctr DLR, Gottingen, Germany

来源：

CEAS SPACE JOURNAL | 2014年 / 6卷 / 01期

关键词：

Hypersonic boundary-layer stabilization; Cone experiments; Ultrasonically absorptive material; Linear stability theory; High enthalpy shock tunnel; Gottingen;

D O I：

10.1007/s12567-013-0053-6

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The damping of acoustic second mode instabilities by passive porous surfaces is investigated numerically and compared with experiments for different hypersonic boundary-layer flows. The used geometry is a blunt 7(circle) half-angle cone model with exchangeable nose. The cone surface consists partly of an ultrasonically absorptive material, which has a natural, random porosity. For the analyses of the second modes, the DLR stability code NOLOT, NOnLocal Transition analysis code, is used. The influence of the nose radius and the unit Reynolds number on the second modes is investigated using a smooth surface. These results of the smooth surface are compared with those of the porous surface to study the damping effect on the second modes and the transition shift. The numerical results are compared with wind tunnel measurements, which were performed in the DLR High Enthalpy Shock Tunnel Gottingen.

引用

页码：13 / 22

页数：10

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