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Close-in characteristics of LH2/LOX reactionsIn deriving shock overpressures from space vehicles employing LH2 and LOX, separate methods of analyses and prediction are recommended, as a function of the distance. Three methods of treatment are recommended. For the Far Field - where the expected shock overpressure is less than 40 psi (lambda = 5) - use the classical PYRO approach to determine TNT yield, and employ classical ordnance (Kingery) curve to obtain the overall value. For the Close-In Range, a suggested limit is 3D, or a zone from a distance of three times the tank diameter to the tank wall. Rather than estimate a specific distance from the center of explosion to the target, it is only necessary to estimate whether this could be within one, two, or three diameters away from the wall; i.e., in the 1, 2, or 3D zone. Then assess whether mixing mode is by the PYRO CBGS (spill) mode or CBM (internal mixing) mode. From the zone and mixing mode, the probability of attaining various shock overpressures is determined from the plots provided herein. For the transition zone, between 40 psi and the 3D distance, it is tentatively recommended that both of the preceding methods be used, and to be conservative, the higher resulting value be used.
Document ID
19860007940
Document Type
Conference Paper
Authors
Riehl, W. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Ullian, L. J. (Eastern Space and Missile Command Florida, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1985
Publication Information
Publication: Johns Hopkins Univ. The 1985 JANNAF Propulsion Meeting, Volume 1
Subject Category
SPACECRAFT PROPULSION AND POWER
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.