Tutorials Manual

Chapter 2: Combustion in Gas-phase Processes
Tutorials Manual
Figure 2-33
Shock Tube Experiment—NO Mole Fraction
2.6 Combustion in Complex Flows
2.6.1 Gas Turbine Network
2.6.1.1 Problem description
2.6.1.2 Problem setup
This tutorial utilizes a PSR-PFR network to predict NO x emission from a gas turbine
combustor.
A PSR network or a hybrid PSR-PFR network is commonly used to simulate mixing
and flow characteristics of a gas turbine combustor. 16,17 This reactor network
approach can greatly reduce the computational burden yet provide reasonable
solutions for a complicated combustion process. However, constructing such a
reactor network is rather empirical. Slight changes in combustor operating conditions
often lead to a new reactor network configuration with a different number of reactors
and connectivity. To speed up the time-consuming trial-and-error process, the
CHEMKIN Interface provides a Diagram View that facilitates building and modification
of a reactor network. A gas turbine reactor network is shown in Figure 2-35. Typically,
a gas turbine reactor network consists of a flame/ignition zone, a recirculation zone,
and a post-flame zone. However, depending on how the fuel and oxidizer are
delivered and the complexity of the flow field, additional reactors and inlets may be
needed to properly represent the combustor. The reactor network shown in
16. A. Bhargava et al., J of Engineering for Gas Turbines and Power 122:405-411 (2000).
17. T. Rutar and P.C. Malte, J of Engineering for Gas Turbines and Power 124:776-783
(2002).
RD0411-C20-000-001 57 © 2007 Reaction Design