Dynamic Analysis of XB-70-1 Inlet Pressure Fluctuations During Takeoff and Prior to a Compressor Stall at Mach 2.5. Technical Report NASA Technical Note TN D-5826, Research Engineering, NASA Dryden Flight Research Center
Martin, Richard A. (1970) Dynamic Analysis of XB-70-1 Inlet Pressure Fluctuations During Takeoff and Prior to a Compressor Stall at Mach 2.5. Technical Report NASA Technical Note TN D-5826, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
Instrumentation in the left inlet of the XB-70-1 airplane was used to record high-response total- and static-pressure data from 0 to 200 hertz during takeoff and immediately prior to a compressor stall at Mach 2.5 and an altitude of 63,100 feet (19,200 meters). Since the statistical assumptions of stationarity, randomness, and normality were found to be approximately valid for the inlet pressure data, random data-analysis techniques were applied. Values of mean turbulence parameter as high as 12 percent were obtained during takeoff and from 14 percent to as high as 31 percent prior to stall. The flight inlet turbulence-producing mechanism, namely, normal-shock boundary-layer interaction, can be simulated successfully in ground test facilities up to at least 40 hertz as evident in the pressure-wave power spectra; however, higher turbulence values were experienced in flight than in model tests by an engine compressor prior to stall.
| EPrint Type: | Other |
|---|---|
| Keywords: | Dynamic distortion, Inlet-engine compatibility, XB-70-1 airplane |
| Subjects: | (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power Aircraft/Project: XB-70 |
| ID Code: | 801 |
| Deposited On: | 16 March 2006 |
| Additional Information: | 58 pages. |
