Accession Number : ADA449915


Title :   High Gravity (g) Combustion


Descriptive Note : Final rept. 10 Feb 1999-28 Feb 2006


Corporate Author : AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE


Personal Author(s) : Zelina, Joseph


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a449915.pdf


Report Date : Feb 2006


Pagination or Media Count : 25


Abstract : Ultra-short combustors to minimize residence time, with special flame-holding mechanisms to cope with increased through-velocities are likely in the future. The Ultra-Compact Combustor (UCC), a novel design based on trapped-vortex combustor (TVC) work that uses high swirl in a circumferential cavity to enhance reaction rates via high cavity g-loading on the order of 3000 g's. Increase in reaction rates translates to a reduced combustor volume. Three combustor geometric features were varied during experiments (1) high-g cavity flame-holding method, (2) high-g cavity to main airflow transport method, and (3) fuel injection method. Results have shown promise for advanced engine applications. Lean blowout fuel-air ratio limits at 25-50% the value of current systems were demonstrated. Combustion efficiency was measured over a wide range of UCC operating conditions. This data begins to build the design space required for future engine designs that may use these novel, compact, high-g combustion systems.


Descriptors :   *COMBUSTORS , VOLUME , AIR FLOW , GAS TURBINES , FUEL AIR RATIO , FUEL INJECTION , GRAVITY , EFFICIENCY , COMBUSTION


Subject Categories : Combustion and Ignition
      Jet and Gas Turbine Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE