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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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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on S2N by Materials Project

NS2 crystallizes in the tetragonal P4_2nm space group. The structure is zero-dimensional and consists of four 1,2,3,5,4,6-tetrathiadiazinane molecules. N3+ is bonded in a bent 120 degrees geometry to two S+1.50- atoms. There is one shorter (1.58 Å) and one longer (1.66 Å) N–S bond length. There are three inequivalent S+1.50- sites. In the first S+1.50- site, S+1.50- is bonded in a distorted single-bond geometry to one N3+ and one S+1.50- atom. The S–S bond length is 2.08 Å. In the second S+1.50- site, S+1.50- is bonded in a water-like geometry to two equivalent S+1.50- atoms. In the third S+1.50- site, S+1.50- is bonded in a bent 120 degrees geometry to two equivalent N3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mo(S2N)2 by Materials Project

MoS4N2 is Iron carbide-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four 4sm molecules and eight ammonia molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgC6(S2N)2 by Materials Project

HgC6(NS2)2 crystallizes in the monoclinic C2/c space group. The structure is one-dimensional and consists of two HgC6(NS2)2 ribbons oriented in the (0, 0, 1) direction. Hg2+ is bonded in a distorted linear geometry to six S2- atoms. There are a spread of Hg–S bond distances ranging from 2.45–3.44 Å. There are three inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a distorted trigonal planar geometry to one N3- and two S2- atoms. The C–N bond length is 1.44 Å. There is one shorter (1.65 Å) and one longer (1.71 Å) C–S bond length. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.35 Å. In the third C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.35 Å. N3- is bonded in a 3-coordinate geometry to three C2+ atoms. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted single-bond geometry to two equivalent Hg2+ and one C2+ atom. In the second S2- site, S2- is bonded in an L-shaped geometry to one Hg2+ and one C2+ atom.

36 MATERIALS SCIENCE↗
NASA NTRS2024

Hybrid Thermally Efficient Core (HyTEC) HyTEC Phase 1 – Advanced Aerodynamics Final Report

The objective of the Hybrid Thermally Efficient Core (HyTEC) – Advanced High Pressure Turbine (HPT) Aerodynamics project is to develop technology for a compact core that contributes to significant fuel burn reductions of 5-10% over current generation technologies. To accomplish this, the HPT is incorporating a range of aerodynamic features and technologies to improve component efficiency and provide favorable systems level trades. In particular, this project explored low solidity airfoils, advanced tip treatments, platform contouring, and advanced ceramic matrix composite (CMC) Stage 2 Nozzle (S2N) airfoils to eliminate the need for post throat cooling in a compact core environment. The maturation of these technology areas is expected to provide a significant improvement in component efficiencies, and consequently reductions in fuel burn, over the current state of the art (SoA). To mature these technologies to Technology Readiness Level (TRL) 4, a test campaign was performed that consisted of four tests at three facilities. TRL 3 testing was performed in the CW22 linear cascade at NASA Glenn for blade and nozzle technologies, TRL 4 nozzle testing was performed at GE Aerospace (GEA) Test Cell A8, and TRL 4 blade testing was performed at the Notre Dame Turbomachinery Laboratory (NDTL) using the Transonic Research Turbine (TRT) rig. Low solidity was successfully demonstrated to a TRL 4 level. Low solidity nozzles showed benefits in line with pre-project expectations, while low solidity blades were shown to have an aerodynamic penalty. Crucially, this program only considered the aerodynamic losses, and systems trades such as reductions in cooling flows are expected to continue to make low solidity blades a net positive. By successfully quantifying the aerodynamic performance in this project, these trades can be conducted to determine where in the engine architecture low solidity blades will contribute positively to system operation. Platform contouring was demonstrated to a TRL 4 level, with performance in line with the lower end of the pre-project expected range. Advanced tip treatments performance levels were indeterminate, showing the expected improvements to flow physics but with a performance level confounded by several rig issues including whirl mode induced variation in tip clearance. The elimination of post-throat cooling on the S2N was successfully demonstrated to provide a performance benefit, however that benefit was approximately half the level that was expected in pre-project predictions. Overall, the technology maturation plan for HyTEC Phase 1 was successful, bringing the suite of technologies to TRL 4.

High pressure turbine↗