Investigation of a Digital Simulation of the XB-70 Inlet and its Application to Flight-Experienced Free-Stream Disturbances at Mach Numbers of 2.4 to 2.6. Technical Report NASA Technical Note TN D-5827, Research Engineering, NASA Dryden Flight Research Center
Gallagher, Robert J. (1970) Investigation of a Digital Simulation of the XB-70 Inlet and its Application to Flight-Experienced Free-Stream Disturbances at Mach Numbers of 2.4 to 2.6. Technical Report NASA Technical Note TN D-5827, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
The capability of a digital inlet simulation program to predict both the performance of the started XB-70 inlet system at free-stream Mach numbers of 2.4 to 2.6 and the dynamic aspects of an inlet unstart at these Mach numbers was analyzed. The simulation-predicted performance was compared with flight measurements, and reasonable agreement was obtained for started and unstarting inlet modes. The agreement between empty-fill (buzz) simulations and flight data was less precise. This was attributed to the need for additional information on the boundary-layer-separation process during this mode of inlet operation. The simulation program was used to determine the reaction of the started inlet over a range of performance levels to free-stream temperature gradients in smooth air and in clear-air turbulence. Atmospheric-temperature variations were found to be nearly as significant as severe turbulence for operation of that type of inlet. Unstart margins for the manually controlled XB-70 inlet in the presence of these disturbances were obtained through use of the simulation program.
| EPrint Type: | Other |
|---|---|
| Keywords: | Atmospheric turbulence, Inlets, Propulsion, System dynamic simulation |
| Subjects: | (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power Aircraft/Project: XB-70 |
| ID Code: | 798 |
| Deposited On: | 16 March 2006 |
| Additional Information: | 28 pages. |
