A study of the mixing of hydrogen injected normal to a supersonic airstream
Jet to free-stream dynamic pressure ratio effects on penetration and mixing of hydrogen injected normal to supersonic airstreams
Rogers, R. C.↗
SEARCH · Engineering Papers
Results for “PENETRATION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Space radiation protection - Space vehicle design criteria
Criteria and procedures for determining dosage of penetrating space radiation and design of appropriate protection for space vehicles
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A study of low velocity impacts into thin sheet aluminum and nylon cloth
Simulation of secondary meteoroid flux by impact of single projectiles on thin sheet aluminum and nylon cloth to define penetration mechanics of spacecraft structures and space suit material
Flaherty, R. E.↗
The Lunar Orbiter meteoroid experiments - Description and results from five spacecraft
Rate of meteoroid penetration of thin beryllium copper detector measured in near-lunar environment by Lunar Orbiter spacecraft
Grew, C. W.↗
Method of making pressurized panel Patent
Method for making pressurized meteoroid penetration detector panels
White, E. C.↗
Changes in the frequency distribution of energy deposited in short pathlengths as a function of energy degradation of the primary beam
Frequency distributions of event size in deposition of energy over small pathlengths measured after penetration of 44.3 MeV protons through thicknesses of tissue-like material
Baily, N. A.↗
Extraterrestrial Lyman alpha
Extraterrestrial Lyman alpha radiation source attributed to solar Lyman alpha scattering on cold interplanetary hydrogen penetrating to inner solar system
Tinsley, B. A.↗
Elastic launch vehicle response to sinusoidal gusts
Separated flow and time lag effects on sinusoidal gust penetration loads and elastic launch vehicle response of Apollo-Saturn class
Ericsson, L. E.↗
OGO 5 observations of the polar cusp on November 1, 1968
OGO 5 polar cusp observations showing dayside magnetosheath plasma penetration during magnetic storm
Chappell, C. R.↗
Experimental study of surface cracks
Analysis of plastic zones surrounding surface cracks in stressed steel and titanium plates subjected to tensile loading shows that back surface dimpling develops at stress levels considerably lower than those predicted by theoretical models of yield zone penetration into back surface.
Source record↗
Main tank injection pressurization program
Computer program predicts performance of fluorine-hydrogen main tank injection pressurization system for full range of liquid-hydrogen-fueled space vehicles. Analytical model includes provisions for heat transfer, injectant jet penetration, and ullage gas mixing. Analysis predicts GF2 usage, ullage gas and tank wall temperatures, and LH2 evaporation.
Cady, E. C.↗
Survey of information concerning large diameter deep hole drilling
Data are presented, covering drilling techniques, factors affecting penetration rates, cost estimation, and system improvement. Various drill bits are also discussed.
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Explosive cord
Device, jetcord, is metal-clad linear explosive of sufficient flexibility to allow forming into intricate shapes. Total effect is termed ''cutting'' with jetcord consistently ''cutting'' a target of greater thickness than can be penetrated. Applications include sheet metal working, pipe cutting and fire-fighting.
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Water impact loads
Computer program to generate time history of load factor and pressure on conical body of revolution during impact with water is discussed. Program calculates depth of penetration, velocity, force, load factor, maximum pressure at water line, and average pressure. Program is written in FORTRAN 4 Level H for IBM 360/85/195 Release 20.1 computer.
Sanders, D. H.↗
Experiment D008: Radiation in the Spacecraft
The ionization and penetration power of various primary and secondary radiations that were present within the Gemini spacecraft was studied. This was accomplished by measurement of the contributions to dose according to profile, particle type, time, and position (location) within the spacecraft. Both active- and passive-dosimetry data collected in this experiment showed that no radiation hazard was associated with manned space operations within the Gemini spacecraft at altitudes as great as 310 kilometers in the South Atlantic anomaly region. This conclusion is warranted also by theoretical calculations.
Schneider, M. F.↗
Experiment T001: Entry communication on the Gemini 3 mission
Water addition to the Gemini 3 exhaust plasma was studied to determine its effectiveness in the establishment of communication links during the entry portion of the flight. Attenuation levels were measured with and without water injection at uhf frequencies of 230.4 and 296.8 megahertz and at the C-band frequency of 5690 megahertz. Ultrahigh frequency signals that had been blacked out were restored to significant levels, during early portions of the water-injection sequence, by the high flow rate injection. The C-band signal was enhanced by medium and high flow rate injections during the latter portion of the injection period. The uhf signal recovered during water injection resulted in an antenna pattern that was beamed in the radial direction of injection from the spacecraft. Postflight analysis showed that the uhf recovery data were consistent with injection-penetration theory.
Schroeder, L. C.↗
Study of aircraft in intraurban transportation systems, San Francisco Bay area
The nine-county San Francisco Bay area is examined in two time periods (1975-1980 and 1985-1990) as a scenario for analyzing the characteristics of an intraurban, commuter-oriented aircraft transportation system. Aircraft have dominated the long-haul passenger market for some time, but efforts to penetrate the very-short-haul intraurban market have met with only token success. Yet, the characteristics of an aircraft transportation system-speed and flexibility-are very much needed to solve the transportation ills of our major urban areas. This study attempts to determine if the aircraft can contribute toward solving the transportation problems of major metropolitan areas and be economically viable in such an environment.
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A seismic survey of the Manson disturbed area
The region in north-central Iowa referred to as the Manson disturbed area was investigated with the seismic refraction method and the bedrock configuration mapped. The area is approximately 30 km in diameter and is not detectable from the surface topography; however, water wells that penetrate the bedrock indicate that the bedrock is composed of disturbed Cretaceous sediments with a central region approximately 6 km in diameter composed of Precambrian crystalline rock. Seismic velocity differences between the overlying glacial till and the Cretaceous sediments were so small that a statistical program was developed to analyze the data. The program developed utilizes existing 2 segment regression analyses and extends the method to fit 3 or more regression lines to seismic data.
Sendlein, L. V. A.↗