SIMULATION OF NUCLEAR THERMAL PROPULSION SYSTEMS

Accurate simulation of nuclear thermal propulsion systems using
computational methods will permit reductions in testing and, thus, the
time and cost of achieving a flight ready status for systems utilizing
this advanced technology. An accurate simulation must maintain a
"balance-of-plant" where the required pump work equals the supplied
turbine work. This turbopump assembly balancing must be integrated into
the overall system analysis models. TPA was developed to balance turbine
and pump work using performance maps. It requires the inlet properties,
performance maps, and shaft speed. TPA then computes the exit conditions
and work terms. The work terms can then be balanced by varying the input
shaft speed.

TPA is written in FORTRAN 77 to be machine independent. TPA has been
successfully implemented on a DEC VAX series computer running VMS, a Sun4
series computer running SunOS, and an IBM PC compatible computer running
MS-DOS. Lahey F77L3 EM/32 v. 5.01 or higher is required for compilation on
an IBM PC compatible computer; however, a PC executable is included on the
distribution diskette. The standard distribution medium for this program
is one 5.25 inch 360K MS-DOS format diskette. Alternate distribution media
and formats are available upon request. TPA was developed in 1993.

NASA's Software Technology Transfer Center
COSMIC, The University of Georgia
382 East Broad St, Athens, GA 30602-4272
(706) 542-3265;  Fax: (706) 542-4807
Internet Email: service@cossack.cosmic.uga.edu

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