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 1799 for “"Tip"”.
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Effects of Tip Clearance Gap and Exit Mach Number on Turbine Blade Tip and Near-Tip Heat Transfer
… on local heat transfer characteristics on the tip and near-tip regions of a turbine blade with a flat tip, tested under transonic conditions in a stationary, 2-D linear cascade consisting of seven blades, the three center blades having a variable tip clearance gap. The effects of tip clearance …
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Turbine tip clearance loss mechanisms
… the actual turbine environment, on turbine blade tip loss. The calculations were carried out for a subsonic high pressure turbine stage. The loss mechanism examined is that due to tip clearance vortex mixing. The effects examined were three-dimensional blade stacking, downstream transition duct …
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Marine propeller blade tip flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1982.
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Optical Fiber Tip Pressure Sensor
… high temperatures, a novel type of optical fiber tip sensor only 125μm in diameter is presented in this thesis. The essential element is a piece of hollow fiber which connects the fiber end and a diaphragm to form a Fabry-Pérot cavity. The all-fused-silica structure fabricated directly on a fiber …
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Unsteady flows in cantilever compressor stator tip clearances and the effect of real tip geometry
… and turbulent flow structure within compressor tip flows. The simulations were performed with clearances of 1.6 and 3.2 percent of chord. The results show that the flow both within the gap and at the exit on the suction side are highly unsteady phenomena controlled by fine-scale turbulent …
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Optimization of the glass fiber forming process for single-tip and small-number-tip positions
… the flow rate of glass through the fiber forming tips. On the small system flow rate is controlled by a combination of changing glass weight and added air pressure. The pressure control system developed in this project uses glass resistance to measure glass depth and outputs a signal to a solenoid …
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Mathematical models of hyphal tip growth
… growth is by the extension of individual hyphal tips only a few microns in diameter. Tip growth is mediated by the incorporation of new wall building materials at the soft apex. Just how this process is controlled (in fungi and in cell elongation in other organisms) has been the subject of …
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Tip-clearance effects in axial compressors
The flow in the tip-clearance gap of a compressor has a profound effect on its performance, but understanding of the actual flow phenomena involved is limited. The current work aims to improve the situation through a comprehensive set of tests on a compressor with different clearance sizes and …
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An experimental investigation of turbine blade tip heat transfer and tip gap flows in the supersonic regime
Gas turbine blade tip heat transfer and tip gap flow phenomena has been explored experimentally in a stationary cascade for blade exit Mach numbers = 1.2 to 1.4. Experimental results were found to agree well with qualitative predictions performed at GE Aircraft Engines. The pressure distribution in …
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Pole tip recession in linear tape systems
The tribology of linear tape storage system including Linear Tape Open (LTO) and Travan5 was investigated by combining X-ray Photoelectron Spectroscopy (XPS), Auger Electron Spectroscopy (AES), Optical Microscopy and Atomic Force Microscopy (AFM) technologies. The purpose of this study was to …
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Vortical structures in turbomachinery tip clearance flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Tip steering of the Atomic Force Microscope.
… a need for methods to actively steer the probe tip of the AFM in order to greatly reduce the time required to image certain samples. This paper proposes a tip steering method that utilizes the vertical feedback information from the AFM sensor as well as the dimensions of the sample object to …
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Loss mechanisms in turbine tip clearance flows
Numerical simulations of tip clearance ow have been carried out to dene the loss generation mechanisms associated with tip leakage in unshrouded axial turbines. Mix- ing loss between the leakage, which takes the form of a strong embedded streamwise vortex (u=ux 1 in the vortex core), and the …
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Studies in Tip Vortex Formation, Evolution and Control
… is used to study the formation and evolution of tip vortices from fixed wings and rotary blades. The numerical error is reduced by using high order accurate schemes on appropriately refined meshes. For vortex evolution problems, the equations are solved on multiple {\em overset} grids that ensure …
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Heat Transfer Enhancement Using Tip and Junction Vortices
This research is important in compact heat exchanger design. Enhancing heat transfer can lead to smaller, more efficient heat exchangers in a broad range of applications. A simplified heat exchanger performance evaluation method is considered to explore the heat transfer benefit and pressure-drop …
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Tip-based nanomanufacturing and metrology of heterogeneous nanostructures
… spectroscopy (AFM-IR). In tDPN, the heated tip of an atomic force microscope cantilever deposits polymer nanostructures onto a surface, where the cantilever heating controls the deposition rate. The nanometer-scale polymer transport between the tip and surface is investigated by controlling …
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Effects of asymmetric tip clearance on compressor stability
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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