Modeling of transient processes in gas-turbine compressors and turbines for engine fault

• Main Author: Sheng, Xiao Hong.
• Other Authors: Ho Hiang Kwee
• Format: Theses and Dissertations
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Mechanical engineering::Motors, engines and turbines
• Online Access: http://hdl.handle.net/10356/42633
• Institution: Nanyang Technological University

Transient performance analysis is important and effective for on line fault diagnosis in gas turbine engines. The present transient thermodynamic model for compressor and turbine is developed for this purpose. The algebraic solution and numerical solution are coupled for the different control volumes according to the different physical laws governing these control volumes. A new concept of plenum whose volume incorporates the space from the down stream of the row to the upstream of the next row is introduced. A variable time step is used to solve the equations. The compressor and the turbine are modeled by three sections, that is, the rotor, the stator with lumped parameters, and the polonium with non-uniform parameters. The loss can be predicted either by experimental correlations and the geometry or by isentropic efficiency in the current model.