Term of Award

Spring 2024

Degree Name

Master of Science, Mechanical Engineering

Document Type and Release Option

Thesis (open access)

Copyright Statement / License for Reuse

Digital Commons@Georgia Southern License

Department

Department of Mechanical Engineering

Committee Chair

Sevki Cesmeci

Committee Member 1

Priya Goeser

Committee Member 2

Prakashbhai Bhoi

Abstract

At present, both governmental and private aviation enterprises are trying to develop aircraft that are swifter, more lightweight, and more cost-effective in order to maintain competitiveness on both the domestic and global stage. Continuous innovation and sustainability efforts are necessary to achieve advancements in aviation systems, such as fans, compressors, combustors, and turbines, as well as sub-systems, like engine seals. Advanced engine seals exhibit considerable potential in enhancing the engine's pressure ratio and cycle temperatures, leading to reduced engine weight, increased thrust, and improved fuel economy. In this study, a novel multistage seal idea has been proposed for the supercritical carbon dioxide (sCO2) heat recovery unit for aircraft engines that utilizes the established Elastohydrodynamic (EHD) lubrication theory. This study utilized a physics-based computer simulation modeling technique. Because of the complex and non-linear interactions between the seal and the fluid domain in Fluid-Solid-Interactions (FSI), a design approach that combines Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) was used. Utilizing the latest advancements in commercially accessible software, the COMSOL Multiphysics program was utilized to conduct fully linked FSI simulations. The modeling technique was comprehensively explained, and the findings were fully examined. The leakage was found to be 0.016 kg/s at 19 MPa. The suggested seal system has the potential to serve as a substitute for the current sealing technologies available in the market.

OCLC Number

1436039373

Research Data and Supplementary Material

No

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