Search NASA⌕ Search

SEARCH · Search NASA

Results for “LP”

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.

257 records · Page 15
All sourcesNASA NTRSDOE OSTI
NASA NTRSDate not supplied

Principles of Directed Energy Deposition for Aerospace Applications

Metal Additive Manufacturing is changing how components are being fabricated for rocket propulsion and aerospace applications. Many additive manufacturing technologies are evolving, and active research is being conducted across academia, industry, and government to advance processes, materials, design, post-processing, and applications. While much focus has been on Laser Powder Bed Fusion (L-PBF) techniques, several large-scale techniques are also rapidly evolving using directed energy deposition (DED) techniques. This lecture will provide an overview of various DED technologies, a comparison among the technologies, various materials, parameters used to deposit, and several examples of DED applications for propulsion and aerospace components.

Additive Manufacturing↗
NASA NTRS2022

Tracking the 2022 Hunga Tonga-Hunga Ha'Apai Aerosol Cloud in the Upper and Middle Stratosphere Using Space-Based Observations

On 15 January 2022, the submarine Hunga Tonga volcanic eruption lofted materials high into the upper stratosphere, reaching a record-breaking altitude of ~58 km, unprecedented in the satellite observations era. Within two weeks, the bulk of the injected material circulated the globe between 20 – 30 km altitude, as observed by satellite instruments. We estimate that the stratospheric aerosol optical depth (sAOD) is the largest since the Pinatubo eruption and is at least twice as great as the sAOD after the 2015 Calbubo eruption despite the similar SO 2 injection from that eruption. We use space-based observations to monitor the Hunga-Tonga volcanic plume evolution and transport at different altitudes as it circulates the globe. While the main aerosol layer remains trapped in the tropical pipe, small parts have already made it to both the northern and southern hemisphere poles by April, which is almost certain to influence this year's ozone hole.

Atmospheric science↗