Accession Number : ADA317107

Title :   Active Control of Combustion Instability in a Ramjet Using Large-Eddy Simulations.

Descriptive Note : Final rept. 1 Sep 92-31 Jul 95,

Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING

Personal Author(s) : Menon, Suresh

PDF Url : ADA317107

Report Date : JUL 1995

Pagination or Media Count : 157

Abstract : This study has developed a large-eddy simulation model for active control. The basic simulation control was extended for general applications, the simulation code was implemented on a massively parallel processor, and two active control techniques (acoustic feedback control and secondary fuel injection control) were investigated. However, the primary focus for active control in this study was on secondary fuel injection techniques, as it had been demonstrated in past experimental studies that this method was more practical. Numerical simulations of fuel injection control were carried out and, in addition, a theoretical model for secondary fuel injection control was developed along with a method to couple the theoretical model to the simulation model. Finally, to implement a robust controller, a fuzzy logic based controller for fuel injection was studied using a simplified problem geometry. To investigate the effects of three-dimensionality, full 3D LES of combustion instability was also carried out.

Descriptors :   *SIMULATION, *COMBUSTION STABILITY, *EDDY CURRENTS, CONTROL, EXPERIMENTAL DATA, THEORY, MATHEMATICAL LOGIC, NUMERICAL ANALYSIS, EDDIES(FLUID MECHANICS), PARALLEL PROCESSORS, CODING, FEEDBACK, GEOMETRY, FUZZY SETS, ACOUSTICS, SIMPLIFICATION, SECONDARY INJECTION, FUEL INJECTION.

Subject Categories : Fluid Mechanics
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE