In this thesis, development of a generic transient aero-thermal gas turbine model
is presented. A simulation code, gtSIM is developed based on an algorithm which
is composed of a set of differential equations and a set of non-linear algebraic
equations representing each gas turbine engine component. These equations are
the governing equations which represents the aero-thermodynamic process of
the each engine component and they are solved according to a specific solving
sequence which is defined in the simulation code algorithm. At each time step,
ordinary differential equations are integrated by a first-order Euler scheme and
a set of algebraic equations are solved by forward substitution. The numerical
solution process lasts until the end of pre-defined simulation time. The objective
of the work is to simulate the critical transient scenarios for different types of
gas turbine engines at off-design conditions. Different critical transient scenarios
are simulated for two di® / erent types of gas turbine engine. As a first simulation,
a sample critical transient scenario is simulated for a small turbojet engine. As
a second simulation, a hot gas ingestion scenario is simulated for a turbo shaft
engine. A simple proportional control algorithm is also incorporated into the
simulation code, which acts as a simple speed governor in turboshaft simulations.
For both cases, the responses of relevant engine parameters are plotted and
results are presented. Simulation results show that the code has the potential to
correctly capture the transient response of a gas turbine engine under different
operating conditions. The code can also be used for developing engine control
algorithms as well as health monitoring systems and it can be integrated to
various flight vehicle dynamic simulation codes.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12609642/index.pdf |
| Date | 01 June 2008 |
| Creators | Kocer, Gulru |
| Contributors | Uzol, Oguz |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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