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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 45861 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Mazaheri, Karim
- Abstract:
- In this thesis, our aim is to simulate steady and transient operation of a turboshaft engine with a free power turbine. For better understanding of physics of the problem, nested loops method is used in order to simulate the steady state operation. Furthermore, methods based on steady operation are used in simulating transient behavior of the engine. Scaling methods are used to extract performance characteristics of the engine components. It is assumed that performance characteristics have similar behavior in high engine shaft speeds. Bearing this in mind, validity of our simulations are confined to such high shaft speed conditions. In addition, for off design analyzes it is assumed that engine design and geometry is fixed. Thus, first we develop a model for steady state operation and then validate it using GasTurb software. After validation, we focus on effects of input parameters like Mach number, fuel, ambient pressure and temperature on steady state operation of the engine. Also in simulating transient operation of the engine, after developing transient model from steady state ones, engine response is extracted according to different flight envelopes including fuel flow rate time function
- Keywords:
- Turboshaft ; Performance Curve ; Performance Simulation ; Steady State ; Transition State ; Off-Design Performance
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