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 11 of 11 for “"leakage flows"”.
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Control of tip-leakage flows using periodic excitation
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
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An Experimental Characterization of Tip Leakage Flows and Corresponding Effects on Multistage Compressor Performance
… smaller blade aspect ratios, for which endwall flows are more important, and the rotor tip clearance height represents a larger fraction of blade span. As a result, data sets collected with large relative rotor tip clearance heights are necessary to facilitate these future small core design …
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Adiabatic Effectiveness Measurements of Leakage Flows along the Hub Region of Gas Turbine Engines
… the hub of a first stage turbine blade caused by leakage flows are discussed in detail. Additionally, this study examines a novel cooling feature, called a microcircuit, which combines internal convective cooling with external film cooling. For the experimental investigation, scaled up blades were …
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Mechanisms of hot gas ingestion in turbine disk cavities
… an experimental study of the effects of rotor leakage flows on hot gas ingestion. It is shown that the presence of leakage flows increases the purge flow required to maintain desired cavity temperatures, and amplifies local variations in surface temperature. A simple, semi-empirical model for …
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Shock formation in overexpanded flow: a study using the hydraulic analogy
… flow in long orifices to gain insight into the leakage flow of turbine tip gaps. The flow was modeled on a water table using a sharp-edged rectangular channel. The hydraulic analogy between free surface water flows and compressible gas flows was used to study the implications of the water table …
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Computational study of 3D turbulent air flow in a helical rocket pump inducer
… and were quantitatively studied. The tip leakage flow observed has velocities of the order of the blade tip speed and is partially convected across the entire passage. The important boundary layer development on the blade pressure side and suction side creates radial outward flows, whereas …
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A row-by-row axial turbine process model based on a one-dimensional thermofluid network approach
… coefficients for turbine stators, rotors and leakage flows which were characterised using correlations available in the literature. Several of the commonly applied loss calculation methods were investigated. A test case of a real turbine obtained in the literature was used to validate the …
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Flow and mixing studies in a co-rotating intermeshing twin screw extruder
… clockwise and is made up of main and small side leakage flows and a portion of the main tetrahedron flows together with a central flow. The flow studies show conclusively that the melt from a particular site ahead of the intermeshing zone occupies a predestined site after passing through the …
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Computational Fluid Flow Analysis of the Enhanced-Once through Steam generator Auxiliary feedwater system
… the fluid analysis, the losses in the bypass leakage flow and broached hole leakage flow were first quantified and then used to model a 1/8th sector of the EOTSG. Using user defined functions (UDF), the loss coefficients of the leakage flows were implemented on the 1/8th sector of the EOTSG …