Normal impingement loads due to small air jets issuing from a base plate and reflecting off a platform for various jet Mach numbers, separation distances, and ambient pressures
National Aeronautics and Space Administration, 1972 - Science - 23 pages
An investigation was conducted in a 12.5-meter-diameter vacuum sphere to determine the impingement loads due to air jets issuing from and perpendicular to a circular base and reflecting off a square platform, that is, a simulation of rendezvous maneuvering, docking, launch, impact dampers etc. The nozzles had exit Mach numbers of 1, 3, 5, and 7. The ambient pressures were 0.0006, 5, 225, and 760 torr. Under near-field separation distances and at 0.0006 torr, reflections were significant; and ratios of the impingement force to thrust on both plates in the biplane arrangement varied from about 750 for exit Mach number 1 to 120 for exit Mach number 7. The far-field force ratios were near unity for the platform and zero for the base and indicated few, if any, reflections. Some reversals and rapid changes in loads were obtained at transition distances between the near and far fields. In general, increasing the exit Mach number or ambient pressure reduced the impingement loads.
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12.5-meter-diameter vacuum sphere air jets issuing alon e ref ambient pres Ambient pressure apparatus base plate reflections circular base plate comparison dashpot due to air earth pressure altitude exit Mach number far-field loads Flat Plate force ratios force to thrust gross thrust H/dj Helium impact dampers impingement loads due investigation was conducted isentropic itform Janos Jet Impinging JET MACH NUMBERS jet-exit Reynolds numbers kN/m2 gage Langley Research Center load ratios load reversals Mach 1 nozzle magnitude multireflections NACA NASA TN near-field results near-vacuum ambient nominal exit Mach normal force NORMAL IMPINGEMENT LOADS nozzle chamber pressure nozzle exit nozzles tested oscillograph overexpanded Performing Organization perpendicular plat PLATE AND REFLECTING platform alone ref platform O Circular presented in figure pressure to ambient ratio of jet ratio of normal reversals and rapid small separation distances Square platform thrust with separation transition distances Variations of ratio