Accession Number : AD1012910


Title :   Experimental Investigation of Turbulence-Chemistry Interaction in High-Reynolds-Number Turbulent Partially Premixed Flames


Descriptive Note : Technical Report,30 Sep 2014,29 Mar 2016


Corporate Author : Clemson University, Department of Mechanical Engineering Clemson United States


Personal Author(s) : Tong,Chenning


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1012910.pdf


Report Date : 23 Jun 2016


Pagination or Media Count : 29


Abstract : The project focused on implementing the photo dissociation-based method for simultaneous two-dimensional imaging of mixture fraction and temperature in turbulent non-premixed/partially premixed flames. Mixture fraction is an important variable in understanding and modeling turbulent mixing and turbulence-chemistry interaction, two key processes in such flames. Previous techniques are limited by one or more factors including the assumption of simplified flame chemistry, the use of non-inert tracer species, and the use of Raman scattering, thereby incapable of providing two-dimensional mixture fraction imaging in flames. Recently, a new method based on photo dissociation of iodine containing species, two-photon laser-induced fluorescence (LIF) of atomic iodine, and Rayleigh scattering was developed by the PI and colleagues at Clemson University, enabling accurate simultaneous two-dimensional imaging in turbulent flames for the first time. The research activities focused on the technical issues in implementing the method, including achieving accurate iodine seeding level, eliminating the interference from LIF of molecular iodine excited at 532 nm and from OH excited at 298 nm, and determination of the system response. Two-dimensional imaging was performed in laminar and turbulent partially premixed methane flames to demonstrate the capability of the new measurement system.


Descriptors :   PHOTODISSOCIATION , flames , turbulence , mixing , REYNOLDS NUMBER


Distribution Statement : APPROVED FOR PUBLIC RELEASE