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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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At least 19 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1996

Flap Side-Edge Noise: Acoustic Analysis of Sen's Model

The two-dimensional flap side-edge flow model developed by Sen is analyzed to reveal the noise production potential of the proposed mechanism. The model assumes that a vortex will form at the equilibrium position off the side edge of the flap. The vortex is then perturbed away from the equilibrium position by incoming turbulence causing it to oscillate and thus radiate sound. The noise field is calculated three-dimensionally by taking the flap to have a finite chord. Spectra and directivity of the farfield sound are presented. In addition, the effect of retarded time differences is evaluated. The parameters in the model are related to typical aircraft parameters and noise reduction possibilities are proposed.

Hardin, Jay C.↗
DOE OSTI2020

Materials Data on CoHgC4(SeN)4 by Materials Project

CoHgC4(NSe)4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. Co2+ is bonded in a tetrahedral geometry to four equivalent N3- atoms. All Co–N bond lengths are 1.92 Å. Hg2+ is bonded in a tetrahedral geometry to four equivalent Se2- atoms. All Hg–Se bond lengths are 2.73 Å. C4+ is bonded in a single-bond geometry to one N3- and one Se2- atom. The C–N bond length is 1.18 Å. The C–Se bond length is 1.81 Å. N3- is bonded in a linear geometry to one Co2+ and one C4+ atom. Se2- is bonded in an L-shaped geometry to one Hg2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SeN by Materials Project

NSe is red selenium-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four NSe clusters. there are four inequivalent N1+ sites. In the first N1+ site, N1+ is bonded in a bent 120 degrees geometry to two Se1- atoms. Both N–Se bond lengths are 1.81 Å. In the second N1+ site, N1+ is bonded in a bent 120 degrees geometry to two Se1- atoms. There is one shorter (1.80 Å) and one longer (1.81 Å) N–Se bond length. In the third N1+ site, N1+ is bonded in a bent 120 degrees geometry to two Se1- atoms. There is one shorter (1.80 Å) and one longer (1.81 Å) N–Se bond length. In the fourth N1+ site, N1+ is bonded in a bent 120 degrees geometry to two Se1- atoms. There is one shorter (1.80 Å) and one longer (1.81 Å) N–Se bond length. There are four inequivalent Se1- sites. In the first Se1- site, Se1- is bonded in a water-like geometry to two N1+ atoms. In the second Se1- site, Se1- is bonded in a water-like geometry to two N1+ atoms. In the third Se1- site, Se1- is bonded in a water-like geometry to two N1+ atoms. In the fourth Se1- site, Se1- is bonded in a water-like geometry to two N1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnCdC4(SeN)4 by Materials Project

CdZnC4(NSe)4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. Cd2+ is bonded in a tetrahedral geometry to four equivalent Se2- atoms. All Cd–Se bond lengths are 2.71 Å. Zn2+ is bonded in a tetrahedral geometry to four equivalent N3- atoms. All Zn–N bond lengths are 1.97 Å. C4+ is bonded in a single-bond geometry to one N3- and one Se2- atom. The C–N bond length is 1.17 Å. The C–Se bond length is 1.81 Å. N3- is bonded in a linear geometry to one Zn2+ and one C4+ atom. Se2- is bonded in a distorted L-shaped geometry to one Cd2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CdHgC4(SeN)4 by Materials Project

HgCdC4(NSe)4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. Hg2+ is bonded in a tetrahedral geometry to four equivalent Se2- atoms. All Hg–Se bond lengths are 2.74 Å. Cd2+ is bonded in a tetrahedral geometry to four equivalent N3- atoms. All Cd–N bond lengths are 2.20 Å. C4+ is bonded in a single-bond geometry to one N3- and one Se2- atom. The C–N bond length is 1.18 Å. The C–Se bond length is 1.81 Å. N3- is bonded in a linear geometry to one Cd2+ and one C4+ atom. Se2- is bonded in an L-shaped geometry to one Hg2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnHgC4(SeN)4 by Materials Project

MnHgC4(NSe)4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. Mn2+ is bonded in a tetrahedral geometry to four equivalent N3- atoms. All Mn–N bond lengths are 2.03 Å. Hg2+ is bonded in a tetrahedral geometry to four equivalent Se2- atoms. All Hg–Se bond lengths are 2.74 Å. C4+ is bonded in a single-bond geometry to one N3- and one Se2- atom. The C–N bond length is 1.18 Å. The C–Se bond length is 1.81 Å. N3- is bonded in a linear geometry to one Mn2+ and one C4+ atom. Se2- is bonded in an L-shaped geometry to one Hg2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsC3(SeN)3 by Materials Project

CsC3(NSe)3 crystallizes in the monoclinic C2/c space group. The structure is two-dimensional and consists of two CsC3(NSe)3 sheets oriented in the (0, 1, 0) direction. Cs1+ is bonded in a 6-coordinate geometry to six N+2.33- atoms. There are a spread of Cs–N bond distances ranging from 3.29–3.36 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a single-bond geometry to one N+2.33- and one Se2- atom. The C–N bond length is 1.17 Å. The C–Se bond length is 1.84 Å. In the second C4+ site, C4+ is bonded in a distorted single-bond geometry to one N+2.33- and one Se2- atom. The C–N bond length is 1.18 Å. The C–Se bond length is 1.83 Å. There are two inequivalent N+2.33- sites. In the first N+2.33- site, N+2.33- is bonded in a distorted single-bond geometry to two equivalent Cs1+ and one C4+ atom. In the second N+2.33- site, N+2.33- is bonded in a single-bond geometry to two equivalent Cs1+ and one C4+ atom. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted single-bond geometry to one C4+ atom. In the second Se2- site, Se2- is bonded in a 1-coordinate geometry to one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgC2(SeN)2 by Materials Project

HgC2(NSe)2 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of two HgC2(NSe)2 ribbons oriented in the (1, 0, 0) direction. Hg2+ is bonded in a 6-coordinate geometry to two equivalent N3- and two equivalent Se2- atoms. Both Hg–N bond lengths are 2.93 Å. Both Hg–Se bond lengths are 2.53 Å. C4+ is bonded in a distorted single-bond geometry to one N3- and one Se2- atom. The C–N bond length is 1.17 Å. The C–Se bond length is 1.84 Å. N3- is bonded in a distorted single-bond geometry to one Hg2+ and one C4+ atom. Se2- is bonded in a 2-coordinate geometry to one Hg2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SeN by Materials Project

NSe is red selenium-derived structured and crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of four NSe clusters. there are three inequivalent N1+ sites. In the first N1+ site, N1+ is bonded in a bent 120 degrees geometry to two equivalent Se1- atoms. Both N–Se bond lengths are 1.80 Å. In the second N1+ site, N1+ is bonded in a bent 120 degrees geometry to two Se1- atoms. There is one shorter (1.80 Å) and one longer (1.81 Å) N–Se bond length. In the third N1+ site, N1+ is bonded in a bent 120 degrees geometry to two equivalent Se1- atoms. Both N–Se bond lengths are 1.81 Å. There are two inequivalent Se1- sites. In the first Se1- site, Se1- is bonded in a water-like geometry to two N1+ atoms. In the second Se1- site, Se1- is bonded in a water-like geometry to two N1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn3(SeN)2 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2022

Porous Colloidal Nanoparticles as Injectable Multimodal Contrast Agents for Enhanced Geophysical Sensing

Injecting fluids into underground geologic structures is crucial for the development of long-term strategies for managing captured carbon and facilitating sustainable energy extraction operations. Here, we have previously reported that the injection of metal–organic frameworks (MOFs) into the subsurface can enhance seismic monitoring tools to track fluids and map complex structures, reduce risk, and verify containment in carbon storage reservoirs because of their absorption capacity of low-frequency seismic waves. Here, we demonstrate that water-based Cr/Zn/Zr MOF colloidal suspensions (nanofluids) are multimodal geophysical contrast agents that enhance near-wellbore logging tools. Based on experimental fluid-only measurements, MIL-101(Cr), ZIF-8, and UiO-66 nanofluids have distinct complex conductivity and/or low-field nuclear magnetic resonance (NMR) signatures that are relevant to field-deployed technologies, implying the potential to enhance near-wellbore monitoring of CO 2 injection and associated processes with downhole logging tools. Small- and wide-angle X-ray scattering characterization of ~0.5 wt % MIL-101(Cr) suspensions confirmed phase stability and provided insight into the fractal nature of colloidal nanoparticles. Finally, low-field (2 MHz) NMR measurements of MIL-101(Cr) nanofluid injection into a prototypical Berea sandstone demonstrate how paramagnetic high-surface area MOFs may dominate the relaxation times of hydrogen-bearing fluids in porous geologic matrices, enhancing the mapping of near-surface and near-wellbore transport pathways and advancing sustainable subsurface energy technologies.

NMR↗
NASA NTRS1975

SENS-5D trajectory and wind-sensitivity calculations for unguided rockets

A computational procedure is described which numerically integrates the equations of motion of an unguided rocket. Three translational and two angular (roll discarded) degrees of freedom are integrated through the final burnout; and then, through impact, only three translational motions are considered. Input to the routine is: initial time, altitude and velocity, vehicle characteristics, and other defined options. Input format has a wide range of flexibility for special calculations. Output is geared mainly to the wind-weighting procedure, and includes summary of trajectory at burnout, apogee and impact, summary of spent-stage trajectories, detailed position and vehicle data, unit-wind effects for head, tail and cross winds, coriolis deflections, range derivative, and the sensitivity curves (the so called F(Z) and DF(Z) curves). The numerical integration procedure is a fourth-order, modified Adams-Bashforth Predictor-Corrector method. This method is supplemented by a fourth-order Runge-Kutta method to start the integration at t=0 and whenever error criteria demand a change in step size.

Singh, R. P.↗