Analytical Fuel Property Effects-Small Combustors
Abstract
This report describes an analytical assessment of the consequences of using broad-property fuels in both conventional and advanced state-of-the-art small gas turbine combustors. Four combustor concepts were chosen for detailed analysis. These included the dual orifice injector baseline combustor (a current production 250-c30 engine combustor) two baseline airblast injected modifications, short and piloted prechamber combustors, and an advanced airblast injected, variable geometry air staged combustor. Final predictions employed the use of the STAC-I computer code. This quasi two dimensional model includes real physical properties, of fuels, effects of injector type on atomization, detailed droplet dynamics, and multistep chemical kinetics. In general, fuel property effects on various combuster concepts can be classified as chemical or physical in nature. Predictions indicate that fuel chemistry has a significant effect on flame radiation, liner wall temperature, and smoke emission. Fuel physical properties that govern atomization quality and evaporation rates are predicted to affect ignition and lean-blowout limits, combustion efficiency, unburned hydrocarbons, and carbon monoxide emissions. Nitric oxide formation is predicted to be dependent primarily on the combustion gas temperature and available oxygen concentration. Finally, STAC-I predicted results clearly indicate that any deteriorated performance characteristics of the alternate fuels are primarily due to the physical properties of the fuels as they affect atomization.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1984
- Accession Number
- ADA239250
Entities
People
- D. L. Troth
- G. A. Miles
- R. D. Sutton
Organizations
- General Motors