Accession Number : ADA308753

Title :   Combustor LBO Design Model Evaluation.

Descriptive Note : Final rept. 11 Sep 87-31 May 94,

Corporate Author : PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT ENGINES AND SPACE PROPULSION

Personal Author(s) : Sturgess, G.

PDF Url : ADA308753

Report Date : 01 MAY 1995

Pagination or Media Count : 350

Abstract : Long-term goals of the Air Force are to develop high-performance gas turbine combustors, and the design systems that can produce them. One aspect of an advanced combustor design system is the ability to calculate flame stability under fuel-lean conditions. Towards satisfying this latter desire the program had three principal objectives: (1) design, conduct and analyze experiments that establish a fundamental understanding of lean blowout, (2) provide a data base for evaluating and refining computer models of gas turbine combustion, and, (3) devise a calculation procedure for lean blowout. Two laboratory and one rig-standard combustors were successfully designed, fabricated and operated. A novel procedure using excess nitrogen as a diluent for simulating sub-atmospheric pressures was calibrated and verified. The sequence of events leading to lean blowout was identified, and observed to be common in all the combustors. Advanced diagnostic techniques were applied to enhance understanding of blowout. Some advanced mathematical modeling was shown to be inadequate for calculating blowout. A hybrid calculation procedure was devised that successfully modeled the influences on blowout of many important operating conditions and design variables. In this manner the program objectives were met.

Descriptors :   *GAS TURBINES, *FLAME PROPAGATION, *COMBUSTION STABILITY, *BLOWOUTS, DATA BASES, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, TIME DEPENDENCE, REACTION KINETICS, AIR FLOW, TURBULENT FLOW, COMPUTATIONAL FLUID DYNAMICS, NITROGEN, COMBUSTORS, CORRELATION, FLOW FIELDS, TEMPERATURE GRADIENTS, THERMAL DIFFUSION, FUEL AIR RATIO, SYSTEMS ANALYSIS, FUEL INJECTORS, BURNING RATE, DESIGN CRITERIA, JET ENGINE FUELS, PRESSURE DISTRIBUTION, PROPANE, SHEAR FLOW, HEAT LOSS, LASER VELOCIMETERS, JET MIXING FLOW, FLAME HOLDERS.

Subject Categories : Combustion and Ignition
      Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE