Program uses component performance maps to enable user to do analytical engine cycle calculations. Either convergent or convergent-divergent nozzles may be used

Fishbach, L. H.

Koenig, R. W.

English

NASA Technical Reports Server

November 1973	 B73-10245 
•	 NASA TECH BRIEF 
Lewis Research Center 	 4V 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
A Computer Program for Calculating Design and Off-Design

Performance of Two- and Three-Spool Turbofans with as Many as Three Nozzles 
A computer program, GENENG II, has been developed 
which calculates the performance of two- or three-spool 
turbofan engines with as many as three nozzles (or 
airstreams). The program uses component performance 
maps to enable the user to do analytical engine cycle 
calculations. Through a sealing procedure, each of the 
component maps can be used to represent a family of 
maps (different design values of pressure ratios, efficiency, 
weight flow, etc.). Either convergent or convergent- 
.	 divergent nozzles may be used. 
Notes: 
1. The program is written in FORTRAN IV for the IBM 
7094 Mod 2 computer. With modifications, the pro-
gram can be used on all machines that have a 
FORTRAN compiler. 
2. An antecedent program, GENENG, calculates steady-
state design and off-design performance for turbofan 
and one- and two-spool turbojet engines, Reference: 
LEW-l2010. 
3. Inquiries concerning these programs should be directed 
to:
COSMIC 
Information Services 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30602 
Reference: LEW-1201 1 
Source: L.H. Fishbach and R.W. Koenig

Lewis Research Center

(LEW-1201 1) 
.
Category 09 
This document was prepared under the Sponsorship of the National
	 Government assumes any liability resulting from the use of the 
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
	 will be free from privately owned rights.
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A computer program for calculating design and off-design performance of two- and three-spool turbofans with as many as three nozzles

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