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Tech Talk Topic: Mathematical Modeling and Analysis of the Turbojet Engine Dynamic Parameters

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Over the years, the aircraft turbojet engine has evolved into one of the most intricate multivariable systems, pivotal in human transportation. It serves not only as a thermodynamic power converter but also as a constant arena for technological advancement. Achieving optimal control and addressing diagnostic challenges necessitates a comprehensive understanding of these engines’ parameters and performance aspects. Often, critical technical details of jet engines remain elusive, with only limited information available in manufacturer catalogs. The primary challenge lies in calculating and extrapolating vital performance parameters, relying solely on data such as fuel flow, jet exhaust temperature, and turbine rotation speed. The impetus for this study stemmed from the need to investigate a recurring issue with several turbojet engines experiencing severe failures during operation. The turbine blades suffered extensive damage in each instance due to excessive heat exposure. The initial step in addressing these problems was developing a mathematical model and dynamic analysis of the turbojet engine. A transfer function for the turbojet engine was defined from operational characteristics and experimental test data. This transfer function described the turbine rotation speed as a controlled parameter, with fuel flow as the controlling parameter. Determining total gain and time constant parameters revealed them as nonlinear functions, primarily reliant on the turbojet engine’s mechanical characteristics and thermodynamic processes. Subsequent to establishing consistent initial conditions, the simulation results were scrutinized and compared with experimental test data. In terms of dynamic behavior, this study underscores the high fidelity of the presented mathematical model for turbojet engines. The simulation results demonstrated a numeric accuracy exceeding 1.5%, highlighting the model’s effectiveness in replicating real-world performance. Co-sponsored by: Seattle University Student Chapter Speaker(s): Neno Novakovic P.E. Agenda: 5.30 Pm to 6.00 PM Networking and Dinner 6.00 PM to 6.05 Welcome by Seattle Section Chair 6.05 PM to 6.50 PM Tech Talk and Question hour. Room: Bannan 629, Bldg: Bannan Engineering Building, Seattle University, 901 12th Ave, Seattle, WA 98122, Seattle, Washington, United States, 98122, Virtual: https://events.vtools.ieee.org/m/373071

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