NNEPEQ—Chemical Equilibrium Version of the Navy/NASA Engine Program

[+] Author and Article Information
L. H. Fishbach

NASA Lewis Research Center, Cleveland, OH 44135

S. Gordon

Sanford Gordon & Associates, Cleveland, OH 44135

J. Eng. Gas Turbines Power 111(1), 114-116 (Jan 01, 1989) (3 pages) doi:10.1115/1.3240205 History: Received March 10, 1987; Online October 15, 2009


The Navy NASA Engine Program, NNEP, developed in 1975, currently is in use at a large number of government agencies, commercial companies, and universities. This computer code has been used extensively to calculate the design and off-design (matched) performance of a broad range of turbine engines, ranging from subsonic turboprops to variable cycle engines for supersonic transports. Recently, there has been increased interest in applications that NNEP was not capable of simulating, namely, high Mach applications, alternate fuels including cryogenics, and cycles such as the gas generator air-turbo-rocket (ATR). In addition, there is interest in cycles employing ejectors such as for military fighters. New engine component models had to be created for incorporation into NNEP, and it was also found necessary to include chemical dissociation effects of high-temperature gases. This paper discusses the incorporation of these extended capabilities of NNEP and illustrates some of the effects of these changes.

Copyright © 1989 by ASME
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