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A throat-bypass stability-bleed system using relief valves to increase the transient stability of a mixed-compression inlet. [yf-12 aircraft inlet tests in the lewis 10 by 10 ft supersonic wind tunnel
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Cole, G. L. Dustin, M. O. Neiner, G. H. |
| Copyright Year | 1979 |
| Description | A stability-bleed system was installed in a YF-12 flight inlet that was subjected to internal and external airflow disturbances in the NASA Lewis 10 by 10 foot supersonic wind tunnel. The purpose of the system is to allow higher inlet performance while maintaining a substantial tolerance (without unstart) to internal and external disturbances. At Mach numbers of 2.47 and 2.76, the inlet tolerance to decreases in diffuser-exit corrected airflow was increased by approximately 10 percent of the operating-point airflow. The stability-bleed system complemented the terminal-shock-control system of the inlet and did not show interaction problems. For disturbances which caused a combined decrease in Mach number and increase in angle of attack, the system with valves operative kept the inlet started 4 to 28 times longer than with the valves inoperative. Hence, the stability system provides additional time for the inlet control system to react and prevent unstart. This was observed for initial Mach numbers of 2.55 and 2.68. For slow increase in angle of attack at Mach 2.47 and 2.76, the system kept the inlet started beyond the steady-state unstart angle. However, the maximum transient angles of attack without unstart could not be determined because wind-tunnel mechanical-stop limits for angle of attack were reached. |
| File Size | 2524663 |
| Page Count | 50 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790020005 |
| Archival Resource Key | ark:/13960/t7wm63682 |
| Language | English |
| Publisher Date | 1979-07-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Flow Stability Fluid Mechanics Air Intakes Yf-12 Aircraft Throats Supersonic Wind Tunnels Wind Tunnel Tests Supersonic Inlets Angle of Attack Bypasses 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 |
