Abstract
Nowadays, gas turbines play a significant role in industry and power generation units. Therefore, any increase in their performance efficiency, is designers’ major concern. Power generation system’s principal considerations are performance, weight and reliability. Gas turbine engine is considered as a probable choice for such applications. This research develops and validates a Bond Graph model based on flow of energy and information of a gas turbine engine. Here, modelling of the gas turbine engine is achieved based on the pseudo Bond Graph approach. Subsequently, by coupling the Bond-Graph component models, a unified framework for model representation is presented. Also, to study the effect of changing external load on turbine’s performance, an industrial two-shaft gas turbine is simulated under large transient loads based on the previously developed component models. Finally, the commercial gas turbine simulation program (GSP) is used to validate the simulation results. Transient response simulations indicate an acceptable error between the GSP and Bond Graph model outputs.
Highlights
Industrial gas turbines have a considerable potential to generate the electrical power and mechanical drive force
One method that is available to the engineers to study the dynamic behavior of gas turbine systems is to develop mathematical models and do simulations in order to better understand the system dynamic behavior
In a two-shaft gas turbine, the dynamic behavior of the gas generator shaft and power turbine shaft can be described by equations (20) and (21), where in these equations, I and N respectively represent the moment of inertia and rotational speed of the gas generator and power turbine shafts
Summary
Industrial gas turbines have a considerable potential to generate the electrical power and mechanical drive force. In 1988, Krikelis and Papadakis [10] modeled a simple cycle of the single-shaft gas turbine using the Bond Graph model and by linearization of the model around an operation point, they designed a PI controller for it They used the pressure, temperature and torque as the effort variables, and the mass flow and engine speed (rpm) as the flow variables. In 2001, Pedersen [1] performed the transient performance modeling of the gas turbine system using the Bond Graph method He developed the energy fields presented by Karnopp and modeled the components of gas turbine system based on them. Up to now, no study on modeling and simulating of the dynamic performance of an industrial gas turbine has been done by the Bond Graph This modeling needs to consider the effects of the inlet guide vanes.
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