Date of Award

1-1-2013

Document Type

Open Access Thesis

Department

Mechanical Engineering

First Advisor

Jamil A Khan

Abstract

Gas Turbine is a complex system and highly non linear in its overall performance. For power generation applications, it is essential to develop a reliable gas turbine model for simulating the impact on electric power generated under various load conditions. This research focuses on development of a dynamic gas turbine model to simulate both single shaft and twin shaft engines. The model is developed on a virtual test bed platform which is an advanced dynamic multidisciplinary simulation environment. The modeling approach starts by developing mathematical models for individual components of gas turbines based on the thermodynamic laws and is coupled together based on the Brayton-gas turbine cycle. Specifically, the compressor and turbine components are represented by manufacturer field test data and utilization of this data has increased the effectiveness of this simulation model. The developed gas turbine model is validated for the design, off-design and transient cases with available data from the literatures. Following the validation, the gas turbine model is applied to a cross-disciplinary co-simulation study. This is done by integrating the gas turbine model with a power generation and distribution system, and a thermal system. The purpose is to investigate the dynamic potential interaction that exists between the operation of the gas turbine engine and the electrical and thermal systems. Finally a variable speed parametric study is performed utilizing the developed gas turbine model. This study is done to demonstrate the opportunities available to improve part load efficiency of gas turbine, when it is operated under variable speed. Comparison of variable speed operation results of single shaft and twin shaft gas turbine engine show that the efficiency increases as load decreases and the improvement is larger for single-shaft engines than for twin-shaft engines.

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