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Technical Paper

Secondary Power System Evaluations for an Unmanned Air Vehicle Configuration

1999-08-02
1999-01-2497
A Thermodynamic analytical program has been developed to help investigate the impact of power system requirements on Tactical Aircraft (TA) and Unmanned Aerial Vehicle (UAV) performance. The Visual Basic for Applications (VBA) program has a user interface that operates in MS-Excel, linking several subsystem analysis programs for execution and data transfer in the power systems analysis. The analytical model is configured to include a UAV encoded propulsion engine cycle code, which allows the inspection of power extraction effects on engine performance. The model was benchmarked by validating the results of the encoded engine program for a TA with an investigation of the separate effects of shaft power extraction and pneumatic bleed air power extraction of power. The selected engine cycle for this purpose was that of the standard TA fighter. The altitude was varied from sea level (SL) to 40,000 ft with a constant Mach number of 0.9.
Technical Paper

Preliminary Thermodynamic Analysis of Power System Impact on Tactical Aircraft Performance

1998-04-01
981288
A computerized thermodynamic analytical program is being developed to help investigate the impact of power system requirements on aircraft performance. The Visual Basic for Applications (VBA) program has a user interface that operates in MS-EXCEL, linking several subsystem analysis programs for execution and data transfer in the power systems analysis. The program presently includes an encoded propulsion engine cycle code, which allows the inspection of power extraction effects on engine performance. To validate the results of the encoded engine program, a study was conducted to investigate the separate effects of shaft power extraction and pneumatic bleed. The selected engine cycle was that for a standard tactical fighter, with a flight condition of varied altitude (sea level to 40k-ft.) and constant Mach Number(0.9). As expected, the resultant data showed that the engine performance was more sensitive to pneumatic bleed than to shaft power extraction.
Technical Paper

Thermal Characteristics of Advanced Thermionics Technology Programs at Wright Laboratory

1992-08-03
929306
This paper summarizes two thermionic technology programs being managed at Wright Laboratory: The Advanced Thermionics Initiative (ATI) Program, and The Thermionics Critical Technology (TCT) Investigation. These programs are supported by Strategic Defense Initiative Organization (SDIO) and United States Air Force, respectively. The described programs contain thermionics technology improvement efforts for both in-core and out-of-core reactor concepts; including, creep resistant emitter materials, cesium reservoirs, diamond film development, design analysis codes, and collector surface physics. This paper describes the current status of these programs, as well as, program goals for future evolutionary improvements in thermionic converter technology.
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