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 20 of 37 for “"Turbomachines"”.
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Vorticity and vortex sheets in axial turbomachines
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1954.
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Is the Weis-Fogh principle exploitable in turbomachines?
In this dissertation we ask whether the Weis-Fogh effect, by which a hovering insect flies with an aerodynamic performance superior to anything previously known, can be exploited in turbomachinery. We think the answer is yes. Normal turbomachinery design is based on the analysis of isolated …
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Reduced-order aerodynamic models for aeroelastic control of turbomachines
Aeroelasticity is a critical consideration in the design of gas turbine engines, both for stability and forced response. Current aeroelastic models cannot provide high-fidelity aerodynamics in a form suitable for design or control applications. In this thesis low-order, high-fidelity aerodynamic …
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Modélisation des tensions circonférentielles en simulation méridienne d'écoulements en turbomachines
… étant trop exigeant en phase de conception de turbomachines, la simulation méridienne, bidimensionnelle, plus simple et plus rapide, est utilisée de manière intensive à l'échelle industrielle. Cependant, sa limitation réside dans son besoin en information empirique pour reproduire l'action des …
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Investigations into rapid aeroelastic stability estimation in turbomachines for preliminary design
Turbomachines are a vital part of today’s energy and transportation industry. They need to perform reliably in order to maximize profit and minimize costs. Fuel efficiency and exhaust gas property demands need to be considered in order to meet ecological concerns. To meet all these criteria, rotor …
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A two-dimensional design method for highly-loaded blades in turbomachines
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1983.
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Effect of vortex core stagnation pressure on tip clearance flow blockage in turbomachines
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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An analytical and numerical study of the second-order effects of unsteadiness on the performance of turbomachines
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Attributes of Bi-Directional Turbomachinery for Pumped Thermal Energy Storage
… the aerodynamic performance of bi-directional turbomachines for pumped thermal energy storage, i.e., turbomachines designed to operate with both forward and backward flow, (ii) carry out performance computations for such turbomachines, and (iii) propose principles for conceptual design of these …
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Optimization of an industrial centrifugal blower using gradient-free and gradient-based (adjoint) approaches
Les progrès réalisés dans la conception des turbomachines aérodynamiques ont suscité un intérêt croissant en raison de la demande pour un avenir plus durable. Bien que les méthodes d’optimisation sans gradient soient couramment utilisées pour optimiser la forme aérodynamique des turbomachines, leur …
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Méthodologie de conception numérique d'un ventilateur hélico-centrifuge basée sur l'emploi du calcul méridien
… méridien pour la conception préliminaire de turbomachines hélico-centrifuges (ou flux-mixte) et l'utilisation du calcul numérique d'écoulement fluide (CFD) pour la conception détaillée. La méthode de calcul méridien à la base du processus de conception proposé est d'abord présentée. Dans un …
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Evaluation of optical techniques applied to online turbomachinery blade vibration measurements
… affect the integrity of measurements captured. Turbomachines typically operate under the adverse conditions of high temperatures, high flow rates and sometimes wet environments. This significantly reduces the life of contact transducers installed to capture the blade dynamics. Installation of …
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Labyrinth Seal Preprocessor and Post-Processor Design and Parametric Study
… cause severe limitation to the performance of turbomachines. The force resulting from the non-uniform pressure distribution within the labyrinth cavity is identified as a major source of this excitation. In order to perform rotor dynamic evaluation of rotor-bearing-seal system, accurate …
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The effects of periodic wake disturbances on flat-plate turbulent boundary layers
Compressor and turbine sections of axial flow turbomachines are subject to periodically disturbed flows. The phenomenon is due to upstream blades creating unsteady periodic wakes that interact with the boundary layer and free stream flows about downstream blades. This study modelled these flow …
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Computational Fluid Dynamics Simulations of Hydraulic Energy Absorber
… may be described as high-loss centrifugal turbomachines arranged to operate as stalled torque converters. The device absorbs the kinetic energy of a vehicle in motion and dissipates the energy into water. A steady, single-phase, Computational Fluid Dynamics (CFD) simulation has been …
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Large Eddy Simulation of Labyrinth Seals and Rib Shapes for Internal Cooling Passges
… important in the design process of future turbomachines, particularly for flows with strong parameter interactions, with an aim to further improve the overall efficiency of gas turbines.
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Investigation of Particle Trajectories for Wall Bounded Turbulent Two-Phase Flows
… flow remains a significant problem for modern turbomachines. The purpose, therefore, is to develop experimental methods for investigating multi-phase flows relevant to the cooling of gas turbine components. Initially, several generic components representing turbine cooling designs were …
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A physics-informed neural network modelling methodology to analyse integrated thermofluid systems
… closed Brayton cycle containing various turbomachines and heat exchangers, and (iii) a simplified boiler consisting of a furnace and radiative convective superheater. The predictions of the three PINN models were compared to benchmark solutions generated via conventional, physics-based …
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Méthodes de prévision acoustique semi-analytiques pour un doublet d'hélices contrarotatives isolé
… dans un outil de prévision de bruit de turbomachines : Optibrui. Une étude paramétrique préliminaire sera faite sur cette source. Les retombées de cette étude sont doubles. Tout d'abord, une meilleure compréhension des mécanismes d'interactions entre un tourbillon et une pale tournante …
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