Development of flowpath design tool for gas turbine engines

Date

2025-6-20

Author

Kündeş, Necmettin Anıl

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The conceptual design phase of a gas turbine engine involves a significant number of iterations between thermodynamic cycle analysis and turbomachinery aerodynamic designs to satisfy all performance requirements. These iterations are performed to ensure that design and off-design thermodynamic cycle requirements are satisfied, design and off-design component performance requirements are met, and the cycle and component designs are consistently integrated. In this thesis, Multi-Level Multi-Design Point (MLMDP) analysis method is developed to eliminate these iterations. This methodology consists of thermodynamic cycle Multi-Design Point (MDP) analyses, turbomachinery MDP analyses, and coupling equations to link these analyses. Requirements and constraints at different operating conditions can be evaluated simultaneously with MDP analysis method in the design phase. Initially, cycle MDP analysis method is studied. NPSS framework, which is used to perform thermodynamic cycle analysis, is also used in the development of cycle MDP analysis method. Subsequently, turbomachinery MDP analysis method is developed. A multi-streamline design and analysis tool for axial compressor and axial turbine is developed within NPSS framework for this purpose. Thereafter, coupling equations are determined to match the results of thermodynamic cycle analyses with the results of turbomachinery analyses. Finally, optimization studies are performed using the models developed for MLMDP analyses. To complete all the tasks required for conceptual design of a gas turbine engine, a component based layout generation and weight estimation tool is developed. Using the developed methodology, a design space that satisfies all performance requirements and constraints can be generated without iterations during the conceptual design phase.

Subject Keywords

Conceptual design, Multi-design point, Multi-level, Optimization

URI

https://hdl.handle.net/11511/115131

Collections

Graduate School of Natural and Applied Sciences, Thesis