Analytical Constraints of Phase Doppler Particle Anemometry in Non-Traditional Environments
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Ramotar, Alexandra Nadini
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Abstract
Phase Doppler Particle Anemometry (PDPA) is an optical diagnostic technique primarily used for evaluating particle size, distribution, and velocity through various mediums. It utilizes phase interference of two laser beams and light scattering to collect data. This non-contact optical method is advantageous in settings where intrusive measurement techniques are undesirable. In the field of aerospace, PDPA is commonly used in combustion, spray dynamics, and fluid mechanics, where understanding particle distribution and motion is essential. PDPA requires careful alignment of its optical components and a controlled environment to ensure accurate results. These ideal conditions include known particle refractive indices, a clearly defined measurement volume, minimal light interference, and an unobstructed laser path. These conditions are attainable in controlled laboratory settings but may not always be ensured when transitioning to industrial and experimental research. PDPA can be a powerful tool to analyze fuel injector properties, where it can be used to optimize the combustion processes. However, there are significant limitations when evaluating these conditions inside a gas turbine combustor. Combustor geometry does not always allow for the appropriate PDPA setup conditions with its complex internal geometry and windows. As fuel particles undergo combustion, the change in particle size can complicate the PDPA measurements more. This experiment aims to investigate the limitations of PDPA in a variety of non-ideal optical configurations for its ultimate implementation in a gas turbine combustor. Assessing the adaptability of PDPA is necessary to determine its efficacy to combustion testing. The findings of this research are applicable not only to aerospace, but to other fields that utilize PDPA as well, such as atmospheric science, pharmaceutical manufacturing, and humidification. By pushing the boundaries of PDPA’s application beyond controlled laboratory settings and factoring in real-world conditions, this research aims to explore the practical challenges of implementing PDPA in industrial settings and contribute to the broader understanding of particle dynamics.
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Undergraduate Research Option Thesis