The man-related activities of the Gulf Stream Drift Mission
NASA program for evaluating underwater vehicle crew performance as space station operational analog
May, C.↗
SEARCH · Engineering Papers
Results for “STREAMS”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Hot corrosion of TD nickel chromium in a high velocity gas stream
Hot corrosion of TD nickel and TD nickel chromium in jet engine exhaust
Proust, H. B.↗
The Anacostia River, ecological imbalance of an urban stream valley
Poor land use and hydrologic practices and physical and chemical pollution of Anacostia river valley
Lahn, R. M.↗
A survey of techniques for recognizing parallel processable streams in computer programs
Computer programs parallel processable tasks recognition techniques survey, discussing algorithms
Gonzalez, M. J.↗
Anomalous streaming of cosmic rays
Cosmic rays anomalous diurnal variations, describing proton excess flux from direction outside geomagnetic field
Lindgren, S.↗
Diagnostics of a supersonic plasma stream using an immersed microwave probe
Electron density profiles in supersonic plasma jet, using immersed microwave probe
Baker, F. A.↗
The mixing of homogeneous co-axial streams
Series solution for unbounded mixing of two incompressible homogeneous coaxial fluids with constant properties, using successive approximations method
Montealegre, A. P.↗
Calculation of obstruction effects on rarefied particle streaming through short tubes
Obstruction effects in rarefied gas flow through cylindrical ducts by numerical analysis, considering specular reflection, adsorption, absorption and finite molecular mean free path
Choong, P. T.↗
Effects of free-stream Reynolds number, engine installation, and model scale on stability characteristics of a translating- spike inlet at Mach 2.0
Explore the source record for details and available documents.
Bowditch, D.↗
Effects of wall cooling and angle of attack on boundary layer transition on sharp cones at free stream Mach 7.4
Tests were conducted on 5 deg and 15 deg half-angle sharp cones at wall-to-total-temperature ratios of 0.08 to 0.4, and angles of attack from 0 deg to 20 deg. The results indicate that (1) transition Reynolds numbers decrease with decreasing temperature ratio, (2) local transition Reynolds numbers decrease from the windward to the leeward side of the model, and (3) transition data on the windward ray of cones can be correlated in terms of the crossflow velocity gradient, momentum thickness Reynolds number, local Mach number, and cone half-angle.
Mateer, G. G.↗
The turbulent boundary layer on a porous plate: An experimental study of the fluid mechanics for adverse free stream pressure gradients
An experimental investigation of transpired turbulent boundary layers in zero and adverse pressure gradients has been carried out. Profiles of: (1) the mean velocity, (2) the three intensities of the turbulent fluctuations, and (3) the Reynolds stress were obtained by hot-wire anemometry. The friction coefficients were measured by using an integrated form of the boundary layer equation to extrapolate the measured shear stress profiles to the wall.
Anderson, P. S.↗
Radio-auroral aspect sensitivity and the two-stream instability.
The possibility is explored that the auroral electrojet current motions may be sufficiently great not only to introduce some distortion in the magnetic field, but also to substantially increase the maximum deviation from orthogonality permitted by Farley's mechanism. These two effects are then combined to give an approximate indication of how the aspect sensitivity should vary with current strength and direction.
Moorcroft, D. R.↗
Evidence from Stream Meteoroids
The physical behavior and composition of shower meteors were examined in an effort to establish the structure of its parent comet. Properties considered include degree of fragmentation and density.
Mccrosky, R. E.↗
Nonequilibrium combustion effects in supersonic streams
This research program is a theoretical and experimental investigation of the effect of nonequilibrium conditions upon the performance of combustors employing supersonic flows. Calculations and experiments are made regarding the effects on the ignition of hydrogen of the nonequilibrium species (free radicals, atoms, water vapor, etc.) obtained using vitiated air. Results of this investigation show that the nonequilibrium free-radical content from a supersonic vitiated air source will cause early ignition of the hydrogen. An analysis of heated air expended from a high temperature source to test section conditions also indicates that there is sufficient free radical content in the incoming flow to cause early ignition. Water vapor, an inherent contaminant in the generation of vitiated air, was found to reduce the ignition delay period under the experimental conditions considered.
Jensen, R. M.↗
Ion streaming instabilities with application to collisionless shock wave structure
The electromagnetic dispersion relation for two counterstreaming ion beams of arbitrary relative strength flowing parallel to a dc magnetic field is derived. The beams flow through a stationary electron background and the dispersion relation in the fluid approximation is unaffected by the electron thermal pressure. The dispersion relation is solved with a zero net current condition applied and the regions of instability in the k-U space (U is the relative velocity between the two ion beams) are presented. The parameters are then chosen to be applicable for parallel shocks. It was found that unstable waves with zero group velocity in the shock frame can exist near the leading edge of the shock for upstream Alfven Mach numbers greater than 5.5. It is suggested that this mechanism could generate sufficient turbulence within the shock layer to scatter the incoming ions and create the required dissipation for intermediate strength shocks.
Golden, K. I.↗
Free turbulent mixing in a coflowing stream
The major points are described of a turbulent transport model of the classical, gradient transport, eddy viscosity type. The relationship is discussed of the developed model to the Prandtl (jet mixing) model, the Schlichting (wake) model, and the Clauser (boundary layer) model. Limitations of the model and test cases are summarized.
Schetz, J. A.↗
Free-stream temperature, density, and pressure measurements in an expansion tube flow
An experimental study was conducted to determine test-flow conditions in the Langley pilot model expansion tube. Measurements of temperature, density, wall pressure, pitot pressure, and shock and interface velocities were compared with theoretical calculations based on various models of the flow cycle. The vibrational temperature and integrated density of the molecular oxygen component of the flow were measured by use of vacuum ultraviolet absorption techniques. These measurements indicate both the presence and possible degree of nonequilibrium in the flow. Data are compared with several simplified models of the flow cycle, and data trends are discussed.
Haggard, K. V.↗
Experimental investigation of a large-scale, two-dimensional, mixed-compression inlet system: Internal performance and drag at transonic conditions, free stream Mach equals 0.6 to 1.28
A large scale, variable-geometry inlet system with a design Mach number of 3.0 was tested at Mach numbers from 0.6 to 1.28. Variable features for off-design operation are an adjustable-height ramp system and a translating cowl. Experimental results are presented for transonic ramp and cowl positions showing the effect of throat boundary layer bleed and vortex generators on engine-face performance. Detailed pressure and force-balance data are used to evaluate transonic drag characteristics.
Wong, N. D.↗