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 61 for “"Blade tip"”.
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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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Methods for Validation of a Turbomachinery Rotor Blade Tip Timing System
… evaluate the performance of a novel blade tip timing (BTT) system from Prime Photonics, LC. The research focused on creating known blade tip offsets and tip vibrations so that the results from a BTT system can be validated. The topic of validation is important to the BTT field as the …
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Experimental investigation of rotordynamic instabilities caused by rotor blade-tip excitation forces
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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An experimental study of blade tip clearance suction applied to a high speed compressor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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An investigation of flow field perturbation caused by constant blade tip clearance in a turbine
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Experimental and Computational Study of Heat Transfer on a Turbine Blade Tip with a Shelf
… materials. The gap between rotating turbine blades and the stationary shroud provides an unintended flow path for hot gases. Gases that flow through the tip region cause pressure losses in the turbine section and high heat loads to the blade tip. This thesis studies the heat transfer on an …
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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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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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Effects of Tip Clearance and Surface Roughness on Small-Scale Turbopump Impeller Performance
… aims to characterize the impact of impeller blade tip clearance and surface roughness on the performance of small-scale turbopump impellers by assessing the dominant flow features, quantifying the underlying loss mechanisms, and determining the sensitivity of performance losses to changes in …
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A Combined Piezoelectric Composite Actuator and Its Application to Wing/Blade Tips
… bar actuator for a helicopter rotor blade flap or blade tip and mirror rotational positioning. In the wing tip case, the tip deflection angle is different only according to the aerodynamic moment depending on the hinge position of the actuator along the chord and applied voltage …
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Tip leakage flow, heat transfer and blade lifing in a jet engine turbine
… developing flow and heat transfer in turbine tip gaps. Successful calculations of the heat transfer to a model turbine blade tip were obtained with a Prandtl mixing length turbulence model. The calculations revealed details of the flow development including recirculation and reattachment on …
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Formation and Development of the Tip Leakage Vortex in a Simulated Axial Compressor with Unsteady Inflow
The interaction between rotor blade tip leakage vortex and inflow disturbances, such as encountered in shrouded marine propulsors, was simulated in the Virginia Tech Linear Cascade Wind Tunnel equipped with a moving endwall system. Upstream of the blade row, idealized periodic inflow unsteadiness …
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Comparison of the Thermal Performance of Several Tip Cooling Designs for a Turbine Blade
Gas turbine blades are subject to harsh operating conditions that require innovative cooling techniques to insure reliable operation of parts. Film-cooling and internal cooling techniques can prolong blade life and allow for higher engine temperatures. This study examines several unique methods of …
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An assessment of body force representations for compressor stall simulation
… agreement except in the vicinity of the blade tip. In terms of stall inception type and stall point, computations based on both representations exhibit agreement with rig test data. A parametric study is undertaken in which the magnitude of the forces in the blade tip region of both …
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Understanding the Responses of a Metal and a CMCTurbine Blade during a Controlled Rub Event using a Segmented Shroud
… composites, provide several benefits over metal blades including weight and increased temperature capability, which may save performance by significant reduction of the cooling flow bled from the compressor. The turbine inlet temperature has consistently increased over the past 70-years. …
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HIGH-SPEED ROTOR TIP CLEARANCE MEASUREMENTS IN A TRANSONIC COMPRESSOR
… on the size of the region between the rotor blade’s tips and the surrounding casing, the tip clearance, which dynamically changes with rising rotor speed due to rotor blade radial growth from centrifugal loading. Too large a tip clearance introduces disruptive air flow that will lower …
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Eddy current displacement sensor with LTCC technology
… of engine health monitoring such as a blade tip sensing systems in turbo-machinery. <br>In this work, first literature and information were collected and compared. An eddy current displacement sensor using the novel LTCC technology was found to match the related measurement conditions …
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Turbine tip clearance loss mechanisms
… of 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 …
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Film Cooling Predictions Along the Tip and Platform of a Turbine Blade
… typically exceeding the melting point of the blade material. Cooling methods investigated in this computational study included parasitic cooling flow losses, which are inherent to engines, and microcircuit channels. Parasitic losses included dirt purge holes, located along the blade tip, and …
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