Analysis of a Computationally Simulated Three Stream Jet Flow for Noise Mitigation
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Mechanical and Aerospace Engineering Honors Theses; 2018
The energetic flow that emanates from a jet engine is what propels aircrafts to their destinations, but it is also the source of noise that is harmful to humans. Exposure to high levels of jet noise can cause acute symptoms like hearing loss and sleep disturbances, while prolonged exposure can significantly decrease a person's quality of life. Due to the ubiquity of commercial air transportation, the problem of jet noise and jet noise mitigation is an important area of research. It is believed that jet noise is caused by the process of turbulent mixing between slow ambient air and fast air coming from an aircraft engine. A proposed mitigation strategy aims to ease this turbulent transition. The solution involves the addition of a third stream of flow to the conventional dual stream turbofan engines. An additional layer of flow strategically placed between the bypass and ambient air could reduce turbulent noise generation. To assess this proposed solution, high-fidelity computational fluid dynamics (CFD) models have been simulated. In this paper, the data resulting from these simulations will be compared to experimental data and analyzed to determine the sonic characteristics of the flow from a threestream engine.
Academic Major: Aeronautical and Astronautical Engineering