![]() ![]() ![]() The program balanced these parameters due to solver iteration until balance was achieved. Initial guessing of seven dependant parameters were chosen. Block modules for the program were built in SIMULINK® using readymade program library or built with the aid of user-defined functions. Numerical, but not realistic, engine components maps were presented to fulfill the matching balance between engine components, thus, scaling these maps to the design point data were carried out. At the design point of GE-CF6-50 engine, the performance characteristics were obtained. ![]() SIMULINK® platform was used to predict the steady-state off-design performance of a separate flow double-Spool turbofan engines. This comprehensive literature document, considering all the aspects of transient behavior and its associated modeling techniques will serve as an anchor point for the future researchers, gas turbine operators and design engineers for effective prognostics, FDD and predictive condition monitoring for variable geometry IGT Among the considered topics are, (i) general transient regimes and pertinent model formulation techniques, (ii) control mechanism for part-load operation, (iii) developing a database of variable geometry inlet guide vanes (VIGVs) and variable bleed valves (VBVs) schedules along with selection framework, and (iv) data compilation of shaft’s polar moment of inertia for different types of engine’s configurations. In the present paper, several critical aspects related to transient behavior and its modeling are reviewed and studied from the point of view of identifying potential research gaps within the context of fault detection and diagnostics (FDD) under dynamic conditions. The transient behavior needs to be accurately predicted since it is highly related to low cycle fatigue and early failures, especially in the hot regions of the gas turbine. In turn, various aero-thermal and mechanical stresses are developed that are adverse for engine’s reliability, availability, and overall health. These transient conditions shift engine thermal equilibrium from one steady state to another steady state. Generally, industrial gas turbines (IGT) face transient behavior during start-up, load change, shutdown and variations in ambient conditions. ![]()
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