Mathematical equations simulate the operation of a rocket engine, simulate destructive and nondestructive tests to verify engine design feasibility, and investigate nonlinear variations in engine performance

Philyaw, B. K.

Randazzo, G. J.

English

NASA Technical Reports Server

November 1968
	 Brief 68-11511 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Rocket Engine Analog Simulation 
Mathematical equations have been developed for 
use in simulating the operation of a rocket engine, 
simulating destructive and nondestructive tests to 
verify engine design feasibility, and investigating 
nonlinear variations in engine performance. The 
mathematical models represent all major engine com-
ponents, including start tank, gas generator, pumps, 
turbines, valves, main combustion chamber, and in-
jectors. The equations, which define the operation of 
the engine system, are scaled for analog computer 
simulation. The analog simulation data include data 
for diode function generators and potentiometer set-
tings required to generate equation constants. The 
simulation system uses three electronic consoles and 
nine recorders capable of recording 72 engine param-
eters simultaneously. Total recording capability with 
the three consoles is 96 channels, which can simul-
taneously record any combination of engine param-
eters during a single run. 
Although the simulation was designed specifically 
for a rocket engine, a portion of the information,
specifically that dealing with pump design feasibility 
and cavitation characteristics, should be of interest to 
pump design engineers in nonaerospace industries. 
Note: 
Documentation for the innovation is available from: 
Clearinghouse for Federal Scientific 
and Technical Information 
Springfield, Virginia 22151 
Price $3.00 
Reference: B68-10511 
Patent status: 
No patent action is contemplated by NASA 
Source: B. K. Philyaw
and G. J. Randazzo
of The Boeing Company
under contract to

Marshall Space Flight Center

(MFS-1451 1) 
Category 01 
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.
https://ntrs.nasa.gov/search.jsp?R=19680000467 2020-03-12T06:03:14+00:00Z


Rocket engine analog simulation

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