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A description of the active and passive sidewall-boundary-layer removal systems of the 0.3-meter transonic cryogenic tunnel
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Murthy, A. V. Ray, E. J. Johnson, C. B. |
| Copyright Year | 1986 |
| Description | Results are presented for an operational checkout and shakedown of the active sidewall-boundary-layer removal system newly installed in the Langley 0.3-meter Transonic Cryogenic Tunnel (0.3-m TCT). Prior to the installation of this active removal system, the sidewall-boundary layer was removed passively by exhausting directly to the atmosphere (i.e., no reinjection). With the active removal system using the reinjection compressor, the removal capability is greatly expanded to cover the entire operating envelope of the 0.3-m TCT. Details of the active removal system are presented including the compressor reinjection circuit, the compressor pressure ratio/surge control, and the compressor recirculation loop. The control logic and features of the compressor surge control are explained. Initial tests covering critical operating conditions show mass flow removal rates of about 5 percent at lower Mach numbers can be obtained with the active system. Measured performance characteristics of the compressor are presented. As part of the validation of the active system, limited airfoil tests were made using the new system. |
| File Size | 10593860 |
| Page Count | 21 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870002368 |
| Archival Resource Key | ark:/13960/t8tb60p42 |
| Language | English |
| Publisher Date | 1986-11-01 |
| Access Restriction | Open |
| Subject Keyword | Research And Support Facilities (air) High Reynolds Number Mass Flow Rate Transonic Wind Tunnels Wind Tunnel Tests Airfoils Wind Tunnel Walls Boundary Layer Control Cryogenic Wind Tunnels Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
