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 “"Turbomachinery blades"”.
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Energy Harvesting toward the Vibration Reduction of Turbomachinery Blades via Resonance Frequency Detuning
… of a semi-active technique for reducing turbomachinery blade vibrations, namely resonance frequency detuning. In contrast with the bulk of energy harvesting research, this effort is not focused on maximizing the power output of the system, but rather providing the low power levels …
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Performance evaluation and improvements of CFD-based aerodynamic design optimization
… were performed for transonic airfoils and turbomachinery blades. Constrained design optimization, based on a modified feasible direction methods was used to improve the aerodynamic performance of single and multi-element airfoils with specified design constraints.
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Blade geometry description using B-splines and general surfaces of revolution
… diagrams for the geometric description of turbomachinery blades. Many of the techniques presented are new and cannot be found in the literature. The geometry construction process is broken into several steps. Each of these steps has variations that constrain different design parameters, …
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Analytical prediction of the unsteady lift on a rotor induced by downstream flow obstructions
… is presented for predicting the unsteady lift on turbomachinery blades caused by the upstream potential disturbance of downstream flow obstructions. The method is applied to a particular geometry which consists of a rotor, a downstream stator, and downstream struts which support the engine casing. …
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A multidisciplinary algorithm for the 3-D design optimization of transonic axial compressor blades
… algorithm for the CFD design optimization of turbomachinery blades is presented. It departs from existing techniques in that it uses a simple, previously-developed Bezier geometry representation (BLADE-3D) that can be easily manipulated to achieve true 3-D changes in blade shape. The algorithm …
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Flow Analysis of Vibration Modes in Turbocharger Turbines
… fluid dynamics forces on the fatigue failure of turbomachinery blades. To that end, we conduct computational flow analysis of a turbocharger turbine with 13 rotor blades and 14 stator blades for precomputed time-dependent blade deformation patterns. The flow analysis is carried out for the rotor …
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Evaluation of optical techniques applied to online turbomachinery blade vibration measurements
Understanding the dynamic characteristics of blades is important in the online condition monitoring of turbomachinery. Conventionally contact methods are used for this purpose. However improvements in technology now allow for the use of non-contact methods. Contact measurement techniques for …