Research Program to Optimize the ST9 Demonstrator Engine IR Suppressor
Abstract
The purpose of this program was to optimize the surface temperature/ emissivity of the ST9 Demonstrator Engine infrared (IR) suppressor to yield the lowest IR signature possible without additional cooling flow requirements. New IR-signature analysis computer programs developed by General Dynamics - Pomona under U.S. Army Air Mobility Research and Development Laboratory (USAAMRDL) contract DAAJ02-69-C-0077 were used to conduct an analytical optimization study. A parametric variation of the temperature and emissivity of the suppressor wall surfaces, divided into many segments, permitted the optimum combination of be chosen. Emissivity-control coatings were then applied to the suppressor surfaces, and the coated suppressor was tested under simulated engine operating conditions. The test results showed that a 22% reduction in the IR signature was achieved and that the measured signature compared favorably with that predicted by the computer programs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1972
- Accession Number
- ADC012517
Entities
People
- C. M. Willard
- Daniel E. Booz Jr.
- Edward B. Thayer
Organizations
- Pratt & Whitney