Graduate Student
Advisor: Philip Smith
380 INSCC
155 South, 1452 East
University of Utah
Salt Lake City, Utah 84112-1114
Phone: 801-585-1244
Fax:801- 585-1456
E-mail: nivedita[@]crsim.utah.edu
Office: 380 INSCC
Research Topic: Subgrid reaction models for turbulent non-premixed combustion and identification of suitable reaction coordinates to bridge the batchelor and resolved scales.
Canonical models currently being studied:
1) Equilibrium using CANTERA
2) Perfeclty Stirred Reactor using CHEMKIN
3) Flamelet model (1-D counter flow configuration)
4) One-Dimensional Turbulence model(ODT)
Brief decription of the work:
The long-term observable dynamics of a reacting system evolve on a low-dimensional, strongly attracting manifold in chemical state space. Thus the physico-chemical state of a reaction flow system at long temporal (and large spatial) scales can be mapped onto a space characterized by a fewer number of parameters than necessary for the fully detailed system. Based on the concept, look-up tables constructed for simple flame configurations using detailed chemisty and transport are coupled to resolved scales to incorporate complex chemical kinetics into the computation. This technique provides the bridging between the Batchelor and resolved scales. My work is focused on an a priori validation of reaction models that are used to construct these look up tables by using the experimental data from various turbulent non-premixed flames. The configurations considered here are different canonical reaction systems such as equilibrium, the perfectly stirred reactor, laminar flamelets and the one-dimensional turbulence model. The predictability of the state of the reacting system by these models when the mapping parameters for the state relationship are mixture fraction and heat loss (normalized enthalpy) will be illustrated by comparison with the experimental data. Results
