Two-channel feed system - A dual channel circularly polarized system. II
Dual channel circularly polarized feed of monopulse tracking antenna system, noting axial ratio and gain and open loop mode autotracking
Chadwick, G. G.↗
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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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Radial rotating antenna-feed system
System incorporating two or more radial feed assemblies tracks and communicates with multiple moving transmitters, receivers, or transponders. System utilizes a fixed parabolic reflector or other beam-forming device such as a lens or spherical reflector.
Dodd, L. R.↗
Dual-frequency feed-horn antenna
Antenna with novel two-port diplexer separates high power /31.65 GHz/ transmitted signal from low power /15.2 GHz/ received signal. Two-port network feeds dual-frequency horn and excites antenna with minimal loss in power. Isolation between transmit port and receive port ranges from 60 db to 80 db.
Schuchardt, J. M.↗
Multi-feed cone Cassegrain antenna Patent
Design and operation of multi-feed cone Cassegrain antenna
Katow, M. S.↗
Horn feed having overlapping apertures Patent
Characteristics of antenna horn feeds consisting of central horn with overlapping peripheral horns
Clark, R. T.↗
Changes and improvements in the construction of large Cassegrain antennae with parabolic hornreflector feeds
Beam equalization in large Cassegrain antennas with parabolic horn reflector feeds
Trentini, G. V.↗
Low noise single aperture multimode monopulse antenna feed system Patent
Development and characteristics of low-noise multimode monopulse antenna feed system for use with microwave communication equipment
Jensen, P. A.↗
Tracking and data acquisition elements research - Polarization diverse S band feed cone
Polarization diverse S band feed cone for DSIF reflector antennas
Freiley, A. J.↗
Propellant feed isolator Patent
Internal labyrinth and shield structure to improve electrical isolation of propellant feed source from ion thrustor
Nakanishi, S.↗
Liquid fluorine feed system component design criteria
Liquid fluorine feed system valves, seals and seats, discussing design criteria for flight weight components
Endicott, D. L.↗
Boiler feed EM pump for a Rankine cycle space power system
Helical induction boiler feed electromagnetic pump design, fabrication and testing for potassium Rankine cycle space power system
Couch, J. P.↗
Fabrication and test of a space power boiler feed electromagnetic pump. Part 2: Test facility and performance test
A three-phase helical induction electromagnetic pump, designed for the boiler-feed pump of a potassium Rankine-cycle space power system, was built and tested. The pump was tested over a range of potassium temperatures from 900 to 1400 F, flow rates from 0.75 to 4.85 lb/sec, developed pressures up to 340 psi, net positive suction heads (NPSH) from 1 to 22 psi, and NaK coolant temperatures from 800 to 950 F. The maximum efficiency at the pump design point of 3.25 lb/sec flow rate, 240 psi developed pressure, 1000 F potassium inlet temperature, and 800 F NaK coolant temperature was 16.3 percent. The tests also showed successful operation of the pump at an NPSH as low as 1.5 psi without cavitating.
Powell, A. H.↗
Fabrication and test of a space power boiler feed electromagnetic pump. 3: Endurance and final performance tests
A three-phase helical induction electromagnetic pump designed for the boiler feed pump of a potassium Rankine cycle space power system was developed and built. It was mounted in a liquid metal test loop and successfully tested over a range of potassium temperatures from 900 to 1400 F, flow rates from 0.75 to 4.85 lb/sec, developed pressures up to 340 psi, net positive suction head from 1 to 22 psi, and NaK coolant temperatures from 800 to 950 F. Maximum efficiency at design point conditions of 3.25 lb/sec flow rate, 240 psi developed head, 1000 F potassium inlet temperature, and 800 F NaK coolant inlet temperature was 16.3 percent. After the performance tests the pump was operated without any difficulty at design point for 10,000 hours, and then a limited number of repeat performance tests were made. There was no appreciable change in pump performance after 10,000 hours of operation. A supplementary series of tests using the quasi-square wave power output of a dc to three-phase ac inverter showed that the pump would operate without difficulty at a frequency as low as 25 Hz, with little loss in efficiency.
Powell, A. H.↗
Fabrication and test of a space power boiler feed electromagnetic pump. Part 1: Design and manufacture of pump
A three-phase helical induction electromagnetic (EM) pump has been designed and built. This pump was designed for use as the boiler-feed pump of a potassium Rankine-cycle space electric power system. The pump is constructed of high temperature materials including a T-111 duct, Hiperco 27 magnetic material, nickel clad silver conductor wire, and a completely inorganic insulation system. The pump is designed to deliver 3.25 lb/sec potassium at 1000 F with a developed head of 240 psi while being cooled by 800 F NaK. At these conditions, the overall pump efficiency is expected to be 18%.
Gahan, J. W.↗
Centaur space vehicle pressurized propellant feed system tests
Engine firing tests, using a full-scale flight-weight vehicle, were performed to evaluate a pressurized propellant feed system for the Centaur. The pressurant gases used were helium and hydrogen. The system was designed to replace the boost pumps currently used on Centaur. Two liquid oxygen tank pressurization modes were studied: (1) directly into the ullage and (2) below the propellant surface. Test results showed the two Centaur RL10 engines could be started and run over the range of expected flight variables. No system instabilities were encountered. Measured pressurization gas quantities agreed well with analytically predicted values.
Source record↗
Dual frequency microwave reflex feed
A dual frequency feed system for a Cassegrainian antenna is provided wherein two frequencies may be transmitted along a single boresight or received simultaneously using a single antenna.
Bathker, D. A.↗
Contamination damage avoidance concepts for propulsion feed system components.
The potential gain in the reliability of reusable long-term mission vehicles through the minimization of component damage due to the ingestion of particulate contamination by feed system components has been recognized by the NASA-LeRC and MDAC, and a program to investigate these problems has been completed. This investigation covered the determination of the cycle life of a typical 2-in. poppet type of shutoff valve in an uncontaminated GH2 environment and then compared this component performance with simulated operation with GN2 and LN2 containing controlled amounts of AL2O2 contaminant particles. The original valve design was tested for contamination damage tolerance characteristics under full flow and cyclic operating conditions, redesigned to improve the damage tolerance to contaminants and then retested. A second method of approach to damage tolerance control was investigated through the evaluation of various types of particulate separation devices. The study included various types of dynamic separators but did not cover conventional filter assemblies.
Endicott, D. L.↗