Benchmark Database for Input and Validation of Multiphase Combustion Models.
Benchmark Database for Input and Validation of
Multiphase Combustion Models.
(261 K)
Widmann, J. F.; Charagundla, S. R.; Presser, C.
Chemical and Physical Processes. Combustion
Institute/Eastern States Section. Proceedings. October
11-13, 1999, Raleigh, NC, 1999.
Keywords:
combustion models; databases; validation; interferometry
Abstract:
Control of process efficiency and the formation of
species byproducts from industrial thermal oxidation
systems (e.g., power generation and treatment of liquid
chemical wastes), is generally based on a priori
knowledge of the input stream physical and chemical
properties, desired stoichiometric conditions, and
monitoring of a few major chemical species in the
exhaust. Optimization of the performance of these
systems is relying increasingly on computational models
and simulations that help provide relevant process
information in a cost-effective manner. Although
computational fluid dynamics (CFD) offers a
cost-effective alternative to experiments, the accuracy
of the CFD model must first be assured. This should be
accomplished in two ways: verification and validation,
Verification involves, ensuring that the algebraic and
differential equations within the model have been
accurately solved. In addition to verifying that the
numerical code arrives at the correct solution, it is
also necessary to determine if the chosen model
accurately represents the physical process of interest.
This is the validation step. The objective of this paper
is to provide benchmark experimental data for CFD model
and submodel validation. This paper presents data
obtained from a baseline spray flame within the
reference spray combustion facility at NIST. The spray
data presented were collected non-intrusively using
phase Doppler interferometry (PDI). The size and
velocity distributions of the fuel droplets, droplet
number density, and volume flux of fuel droplets within
the spray have been obtained. The enclosed combustion
chamber provides well-characterized boundary conditions,
and wall and ceiling temperature profiles have been
measured. Gas temperature and species measurements
obtained at the reactor exit can be used for boundary
conditions or validation of computational results. The
inlet combustion air has been characterized using a 3-D
CFD simulation to determine the velocity and turbulence
intensity profiles, and the simulation has been
validated with experimental data. Gas-phase velocity,
temperature, and heat flux measurements are planned for
completing this baseline case.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899