Accession Number : ADA187898

Title :   Application of System Identification Techniques to Combustor Poststall Dynamics.

Descriptive Note : Final rept. Dec 84-Sep 86,

Corporate Author : PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV

Personal Author(s) : Steele, L L ; Grant, J R , Jr ; Harrold, D P ; Erhart, J J ; Anex, R P

PDF Url : ADA187898

Report Date : Sep 1987

Pagination or Media Count : 141

Abstract : The combustor (main burner) of gas turbine engines has been identified as a significant contributor to the degree of recoverability of engine surge events. Whether or not the combustor blows out and if so, whether it rapidly relights, can determine whether or not rotating (nonrecoverable) stall will occur. Component stall investigations have traditionally concentrated on the compression system and experience has shown that traditional methods of obtaining data are generally inadequate in identifying poststall characteristics. The objective of this program is to apply system identification techniques to design experiments which will be suitable for extracting combustor poststall characteristics. The program was entirely analytical in nature. During the combustor model survey many models, modeling approaches, and combustion physics were examined. The objective was to provide an improved combustor dynamic model. The model derived under the Air Force Nonrecoverable Stall Investigation (F33615-79-C-2087) was selected as a starting point since it represented state of the art. Physics improvements were incorporated, including characteristic time approaches for ignition and stability. During the test configuration definition, the planned United Technologies Research Center Transient Combustion Facility was selected as the only cost-effective, flexible test vehicle of all candidates screened.

Descriptors :   *COMBUSTION, *COMBUSTORS, COST EFFECTIVENESS, DYNAMICS, IDENTIFICATION, IGNITION, MODELS, PHYSICS, SURVEYS, TEST VEHICLES, TIME

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE