Accession Number : ADA487085


Title :   Hypermixer Pylon Fuel Injection for Scramjet Combustors


Descriptive Note : Doctoral dissertation


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Doster, Jason C.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA487085


Report Date : 11 SEP 2008


Pagination or Media Count : 187


Abstract : Fueling the core airflow of a circular or elliptical scramjet combustor cross-section often requires intrusive geometries. Intrusive geometries can distribute the fuel evenly across the combustor cross-section and act as a flameholder for the fuel/air mixture. Compared to conventional transverse or angled wall injection, intrusive geometries allow easier penetration into the core combustor airflow and reduced fuel injection pressures. The design and testing of an intrusive pylon geometry for scramjet combustor fueling is the subject of this research. Three pylon configurations are compared: a basic pylon, a ramp pylon, and an alternating wedge pylon. All three pylon configurations exhibit the same frontal area and inject fuel parallel to the combustor airflow with long, thin rectangular injection ports (thin film fueling). However, the three pylon configurations incorporate different aft shapes to facilitate fuel/air mixing. A cold flow fuel injection study is accomplished to compare mixing capabilities and total pressure losses of the three pylon configurations. The ramp and alternating wedge pylons show decisive increases in mixing capability compared to the basic pylon. They also exhibit a slight increase in total pressure loss compared to the basic pylon.


Descriptors :   *RAMAN SPECTROSCOPY , *AIR FLOW , *JET ENGINE FUELS , *SUPERSONIC COMBUSTION , *FUEL INJECTORS , *MIXING , *COMBUSTORS , FUEL AIR RATIO , WIND TUNNELS , REFUELING , STRUTS , FUEL INJECTION , FLAME HOLDERS , SUPERSONIC COMBUSTION RAMJET ENGINES , COMPUTATIONAL FLUID DYNAMICS , THESES , THIN FILMS , CROSS SECTIONS


Subject Categories : ATOMIC AND MOLECULAR PHYSICS AND SPECTROSCOPY
      COMBUSTION AND IGNITION
      FUELS


Distribution Statement : APPROVED FOR PUBLIC RELEASE