NASA Scientific and Technical Aerospace Reports

materials were suggested options to reduce system development risk. Carbon-carbon sheeting or foam proved an attractive
option to improve overall performance.
Author
Performance Prediction; Closed Cycles; Brayton Cycle; Heat Exchangers; Spacecraft Power Supplies; Nuclear Electric
Power Generation
20040120977 NASA Glenn Research Center, Cleveland, OH, USA
Method for Forming MEMS-Based Spinning Nozzle
Okojie, Robert S., Inventor; August 03, 2004; 9 pp.; In English; Original contains black and white illustrations
Patent Info.: Filed 13 Aug. 2002; US-Patent-6,770,208; US-Patent-Appl-SN-219385; US-Patent-Appl-SN-816722;
NASA-Case-LEW-17110-2; No Copyright; Avail: CASI; A02, Hardcopy
A nozzle body and assembly for delivering atomized fuel to a combustion chamber. The nozzle body is rotatably mounted
onto a substrate. One or more curvilinear fuel delivery channels are in flow communication with an internal fuel distribution
cavity formed in the nozzle body. Passage of pressurized fuel through the nozzle body causes the nozzle body to rotate.
Components of the nozzle assembly are formed of silicon carbide having surfaces etched by deep reactive ion etching utilizing
MEMS technology. A fuel premix chamber is carried on the substrate in flow communication with a supply passage in the
nozzle body.
Author
Fabrication; Spray Nozzles; Microelectromechanical Systems; Fuel Injection; Atomizers; Fuel Sprays
20040120983 NASA Langley Research Center, Hampton, VA, USA
A Hardened CARS System Utilized for Temperature Measurements in a Supersonic Combustor
Antcliff, Richard R.; Smith, Michael W.; Jarret, Olin, Jr.; Northam, G. Burton; Cutler, Andrew D.; Taylor, David J.; [1990];
7 pp.; In English; Original contains black and white illustrations; Copyright; Avail: CASI; A02, Hardcopy
A coherent anti-Stokes Raman scattering (CARS) system has been hardened for use in a NASA Langley supersonic
combustion test cell. The system can obtain temperature cross sections of the flow at three locations. The system is
environmentally protected and remotely operated. Measurements were made in a scram-jet combustor model consisting of a
rear- ward-facing step, followed by an expansion duct. The duct is nominally 4 feet in length. The free stream conditions were
Mach 2, with static pressure which ranged from 0.8 to 1.9 atm, and a static temperature of approximately 800K. Three vertical
slots were machined into each side of the duct to allow optical access. The CARS system utilized a planar BOXCARS beam
arrangement. This arrangement allowed the laser beams to pass through the vertical slots in the tunnel. Translation stages were
utilized to move the focussing volume within the tunnel. These stages allowed complete cross sections to be obtained at each
slot location. A fiber optic carried the signal to a remotely located monochrometer and reticon detector.Data for two different
flow conditions were taken at each of the three slot locations. These two conditions provided a comparison between reacting
and non-reacting mixing of injected hydrogen fuel with the combustion heated supersonic stream.
Author
Combustion Chambers; Gas Streams; Supersonic Combustion; Temperature Measurement
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CHEMISTRY AND MATERIALS (GENERAL)
Includes general research topics related to the composition, properties, structure, and use of chemical compounds and materials as they
relate to aircraft, launch vehicles, and spacecraft. For specific topics in chemistry and materials see categories 25 through 29. For
astrochemistry see category 90 Astrophysics.
20040111147 Lawrence Livermore National Lab., Livermore, CA
Primary Polymer Aging Processes Identified from Weapon Headspace Chemicals
Chambers, D. M.; Bazan, J. M.; Ithaca, J. G.; Mar. 25, 2002; In English
Report No.(s): DE2004-15005694; UCRL-JC-147870; No Copyright; Avail: National Technical Information Service (NTIS)
A current focus of our weapon headspace sampling work is the interpretation of the volatile chemical signatures that we
are collecting. To help validate our interpretation we have been developing a laboratory-based material aging capability to
simulate material decomposition chemistries identified. Key to establishing this capability has been the development of an
automated approach to process, analyze, and quantify arrays of material combinations as a function of time and temperature.
Our initial approach involves monitoring the formation and migration of volatile compounds produced when a material
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