Program computes specific power output, specific fuel consumption, and cycle efficiency for power systems having any number os shafts up to maximum of five. Maximum temperatures should be no higher than about 2000 K (3140 F) because molecular dissociation is not included in stoichiometry

Glassman, A. J.

English

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March 1975	 B75-10002 
•	 NASA TECH BRIEF 
Lewis Research Center 
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Computer Program for Thermodynamic Analysis 
of Open-Cycle Multishaft Power System 
The Problem:	 Notes: 
A better, more accurate method for thermodynamic	 1. This program is written in FORTRAN IV for use on an 
analysis of an open-cycle, multishaft power system was 	 IBM 7090/7094 computer. 
required for the study of power production applications. 	 2. Inquiries concerning the program should be directed 
to: 
The Solution: 
The first phase in the analysis of any power cycle is the 
determination of the thermodynamic performance as a 
function of the cycle variables; this computer program 
was developed to perform such analyses. 
,.	 How It's Done: 
The program can compute specific power output, 
specific fuel consumption, and cycle efficiency for power 
systems having any number of shafts up to a maximum of 
five. On each shaft there can be any number of compres-
sors and turbines up to a maximum of five each, along 
with any specified number of intervening intercoolers and 
reheaters. A recuperator can be included in the system. 
Turbine coolantflow can be accounted for. The combus-
tion-gas thermodynamic properties are valid for any fuel 
consisting of hydrogen and/or carbon only. The program 
should be used with maximum temperatures no higher 
than about 2000 K (3140'F) because molecular dissocia-
tion is not included in the stoichiometry. 
The analysis determines specific power output, specific 
fuel consumption, and cycle efficiency as functions of 
turbine-inlet temperature, compressor pressure ratio, and 
component performance factors. Improvements in cycle 
performance resulting from the use of intercooling, 
reheating, and recuperation can also be determined. 
Equations are included for the thermodynamic proper-
ties of the gas, analysis of the fluid state changes in each 
component, and computation of the system performance 
in terms of specific power output, specific fuel consump-
tion, and cycle efficiency.
COSMIC 
Information Services 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30602 
Reference: LEW-12324
Source: Arthur J. Glassman
Lewis Research Center
(LEW- 12324) 
.
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This document was prepared under the sponsorship of the National
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Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
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Computer program for thermodynamic analysis of open-cycle multishaft power system

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