Development of aero-thermodynamic cycle design code for turboshaft engines and investigation of fouling effects on performance

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Umut Sadikoglu Thesis.pdf

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2022-8-04

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Sadıkoğlu, Umut

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In this thesis, a turboshaft engine performance analysis code is developed on MATLAB. Furthermore, compressor map generation from limited data and deterioration effects on the engine performance are investigated. It is considered that the first step of designing a gas turbine is the selection of the aero-thermodynamic cycle. For this purpose, design point analysis with the parametric design capability is conducted and engine limits are determined. Subsequently, off-design analyses are initiated. During the off-design analyses, component performance maps are scaled according to the design point analysis results. Construction of the performance maps is followed by determining the matching points of the components with varying operating conditions. Then, the engine performance during transitions is examined using the polar moments of inertia of the components and fuel flow outputs of the off-design analyses. Steady-state and transient performance analyses mentioned up to this point is verified by GasTurb 14. For the validation of the code, the General Electric T700 engine is chosen. The developed code is then combined with the compressor performance map generation method called stage-stacking. The General Electric LM2500-30 engine is used for the stage stacking algorithm due to access to its running line and flow field geometry data. Lastly, stage fouling effects on the performance parameters are evaluated for the compressor section. For this purpose, a modified version of the method suggested by MacIsaac is used. Once the clean and fouled maps of the compressor are obtained, steady-state and transient performance analyses are performed to assess the effect of compressor fouling on overall engine performance.

Subject Keywords

Helicopter turboshaft engine, Gas turbine performance modeling, Thermodynamic matching model, Gas turbine performance deterioration, Stage-stacking technique

URI

https://hdl.handle.net/11511/98704

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

U. Sadıkoğlu, “Development of aero-thermodynamic cycle design code for turboshaft engines and investigation of fouling effects on performance,” M.S. - Master of Science, Middle East Technical University, 2022.