Accession Number : ADA554932


Title :   Injector-Wall Interactions in Gas-Centered Swirl Coaxial Injectors


Descriptive Note : Conference paper


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE


Personal Author(s) : Lightfoot, M D ; Schumaker, S A ; Narayanan, V ; Eilers, B ; Danczyk, S A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a554932.pdf


Report Date : 05 Oct 2011


Pagination or Media Count : 13


Abstract : Tailored injectors near the wall of a combustion chamber are often an integral part of a rocket engine's thermal management. However, most studies of injectors utilize single, isolated elements. The ability of walls to affect the expansion and stability of single-phase jets has already been well established. The effect of a wall on a multiphase flow, a spray, has not been established. Reported here is the impact a single wall has on the behavior of a spray from a single injector. Of specific interest are parameters which may impact engine performance, specifically attachment length, spray growth and stability. The atomizer being studied is a gas-centered swirl coaxial injector which relies on a dominant gas flow to drive the atomization. High-speed images are analyzed to assess the spray's behavior both qualitatively and quantitatively. Three wall offset ratios, 0.57, 0.83 and 1.16, are compared to the free spray. Sprays are qualitatively similar, but the wall has a quantitative effect on spreading rate. The wall is able to decrease the variability in the spray, but not globally-only very near the wall.


Descriptors :   *INJECTORS , COAXIAL CONFIGURATIONS , COMBUSTION CHAMBERS , GAS FLOW , ROCKET ENGINES , TEMPERATURE CONTROL


Subject Categories : Combustion and Ignition


Distribution Statement : APPROVED FOR PUBLIC RELEASE