Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"flow-acoustic"”.
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Effect of Flow-Acoustic Resonant Interactions on Aerodynamic Response of Transitional Airfoils
… study is conducted to examine the impact of flow-acoustic resonant interactions on the aerodynamic response of symmetric and cambered airfoils in the realistic transitional flow regimes with Rec=140,000 and M=0.0465 as well as the low Reynolds number flow regime with Rec=10,000 and M=0.2. The …
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Large eddy simulation of acoustic propagation in turbulent flow through ducts and mufflers
This research involves study of acoustic propagation of pulse in a simple expansion muffler, which is very often used in HVAC or automotive exhausts. A hybrid pressure-based compressible solver is developed and validated for a low Mach number flow simulation of acoustic pulse. This new solver is …
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Development of instrumentation for acoustic monitoring
This thesis describes a source/sink flow acoustic wave sensor for the identification of leaks in gas pipelines. One of the many type of signals associated with the high velocity gas flowing out of a hole in the pipeline is the ramp or step pressure drop.;A large 3-inch diameter diaphragm was …
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Flow-sound interaction mechanism of a single spirally finned cylinder in cross-flow
… the vortex shedding frequency and one of the acoustic cross-modes of the duct housing the finned tubes. This may reduce the service life of the heat exchangers, and adversely affect the health of individuals working in the proximity of such noise. Since the flow-acoustic phenomenon of finned …
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Anwendung des Lattice-Boltzmann-Verfahrens zur Berechnung strömungsakustischer Probleme
… regard to application to numerical solution of flow acoustic problems. In the first part of this study the description of sound wave propagation by common variants of the Lattice-Boltzmann-model is examined by calculation of phase velocity and effective viscosity for sound waves. Schemes with …
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Prediction of Tonal Acoustic Radiation Due to Feedback-Loop Resonant Interactions in Transitional Airfoils
… study the far-field noise propagation from the flow acoustic resonant interactions of the transitional airfoil. The Potential-Theoretic Method (PTM) as an advancement to traditional Kirchhoff methods is presented. The PTM eliminated the need to calculate the normal derivatives of pressure and an …
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Optimization of indentification of particle impacts using acoustic emission.
… at severe operating conditions such as high-flow velocity can cause concerns for structural integrity, through wear originating from particle impacts with the structure. To apply Acoustic Emission (AE) in particle-impact monitoring, previous researchers focused primarily on dry particle …