AIR-BLAST PHENOMENA IN THE HIGH-PRESSURE REGION

Technical Report · Thu Dec 15 04:00:00 EST 1960

OSTI ID:4828929

Swift, L M; Sachs, D C; Kriebel, A R

Surface level and aboveground static overpressures, near-surface differential pressures, and near-surface total pressures were measured on Burst Priscilla. Gages were placed at ground ranges from 450 ft to 4500 ft, with a concentration of measurements in the high-pressure region. Blast swttches, which measured arrival time only, were placed at several ranges, the closest at 100-ft range. A precursor wave formed near 500-ft ground range, and dissipated between 2000 and 2500 ft. Burst Priscilla shock velocity agrees with the ideal except between 500- and 2000-ft ranges where it exceeds the ideal. At high pressures, overpressures agree well with those predicted over an ideal surface, although surface maxima are-depressed below the ideal curve. Total-head pressures obtained in the Mach reflection region agree with the ideal until 850 ft. From 850 to 2500 ft, peak total pressure is significantly higher than the ideal. Miaximum differential pitot-tube pressures are higher than predicted over an ideal suriace. Diiferential pressure wave-form classifications based on the degree of deviation irom the corresponding overpressure wave form indicates that at close-in scaled ground ranges total-head pressure wave forms iollow fairly closely those of the overpressure. Comparison of Hess' stagnation bubble theory with precursor phenomena sug gests that this theory can be used to describe precursor for mation. (auth)

• Research Organization: Stanford Research Inst., Menlo Park, Calif.
• NSA Number: NSA-16-002834
• OSTI ID: 4828929
• Report Number(s): WT-1403
• Country of Publication: United States
• Language: English

Related Subjects

AIR
CONFIGURATION
FLOWMETERS
GAGES
GENERAL AND MISCELLANEOUS
LEVELS
MACH NUMBER
MACH REFLECTION
MEASURED VALUES
PITOT TUBES
PRESSURE
REFLECTION
SHOCK WAVES
SURFACES
SWITCHES
TUBES
VELOCITY