Self-Aligned Focusing Schlieren at the 0.3-M Transonic Cryogenic Tunnel and the National Transonic Facility

被引：0

作者：

Weisberger, Joshua M. ^{[1
]}

Bathel, Brett F. ^{[1
]}

Danehy, Paul M. ^{[1
]}

Boyda, Matthew T. ^{[1
]}

Tyrrell, Olivia K. ^{[1
]}

Ripley, W. Holt ^{[1
]}

Jones, Gregory S. ^{[2
]}

Burns, Ross A. ^{[3
]}

Kwok, Andy K. ^{[4
]}

Jones, Stephen B. ^{[5
]}

机构：

[1] NASA, Langley Res Ctr, Adv Measurements & Data Syst Branch, Hampton, VA 23681 USA

[2] NASA, Langley Res Ctr, Configurat Aerodynam Branch, Hampton, VA 23681 USA

[3] ViGYAN Inc, Adv Measurements & Data Syst Branch, Hampton, VA 23666 USA

[4] Jacobs Technol Inc, Subson Transon Testing Branch, Hampton, VA 23681 USA

[5] Analyt Mech Associates Inc, Adv Measurements & Data Syst Branch, Hampton, VA 23681 USA

来源：

AIAA SCITECH 2024 FORUM | 2024年

关键词：

D O I：

暂无

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The implementation of a self-aligned focusing schlieren (SAFS) system at two cryogenic wind tunnels at NASA Langley Research Center is discussed. Risk-reduction testing of the SAFS system was first performed at the 0.3-M Transonic Cryogenic Tunnel to evaluate the system's operation in a small-scale characteristic cryogenic facility. Testing was conducted with three models: a three-quarter span 25.4-mm-diameter cylinder, a semi-span 65A006 tapered unswept airfoil, and a full-span SC(3)-0712 airfoil. Testing with the cylinder revealed a highly dynamic shock environment, whereas the shock on the full-span airfoilwas stationary, solidifying the usage of this model for a pre-/post-shock particle tracking velocimetry measurement. Temperature-induced polarization-altering window stresses were encountered during low-temperature testing, and were mitigated using a "non-ideal" quartz/quartz Rochon prism that had largely been neglected since the SAFS system's first introduction in favor of the more favorable "ideal" glass/quartz Rochon prism. The size of the SAFS system was then decreased in order to fit inside an environmentally-controlled camera can enclosure at the National Transonic Facility (NTF) for testing of a sting-mounted aircraft model. The SAFS system was demonstrated to be effective at filtering out the large density gradient flow in the 0.3-M plenum, and the thick, high density turbulent boundary layers on the wind tunnel walls at the NTF. Results of the testing campaigns and improvements to future systems are discussed.

引用

页数：29