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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 129 for “"Purge"”.
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Influence of Purge Flow Swirl and Passage Discrete Hole Injection Angle on Turbine Blade Endwall Cooling
… secondary flow structures within blade passages. Purge flow coolant, which passes through the gap between the stator and rotor, and discrete cooling holes, which are positioned strategically within the coolant passage, are often utilized together to provide complete cooling coverage on the blade …
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Experimental Study of the Heat Transfer on a Squealer Tip Transonic Turbine Blade with Purge Flow
… distribution of a squealer tip rotor blade with purge flow cooling and provide a comparison with a basic flat tip rotor blade without purge flow cooling, under transonic conditions and high inlet free stream turbulence intensity. The blade design was provided by Solar Turbines Inc., and consists …
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Aerodynamics of a Transonic Turbine Vane with a 3D Contoured Endwall, Upstream Purge Flow, and a Backward-Facing Step
… a non-axisymmetric endwall contour and upstream purge flow on the secondary flow of an inlet guide vane. Three cases were tested in a transonic wind tunnel with an exit Mach number of 0.93-a flat endwall with no upstream purge flow, the same flat endwall with upstream purge flow, and a 3D …
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Aerodynamics of Endwall Contouring with Discrete Holes and an Upstream Purge Slot Under Transonic Conditions with and without Blowing
… contouring with discrete holes and an upstream purge slot for a high turning (127") airfoil passage under transonic conditions are investigated. The total pressure loss and secondary flow field were measured for two endwall geometries. The non-axisymmetric endwall was developed through an …
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The Effect of Density Ratio on Steep Injection Angle Purge Jet Cooling for a Converging Nozzle Guide Vane Endwall at Transonic Conditions
… rates for a typical nozzle guide vane platform purge jet cooling scheme. An axisymmetric converging endwall with an upstream doublet staggered cylindrical hole purge jet cooling scheme was employed. Nominal exit flow conditions were engine representative and as follows: {rm Ma}_{Exit} = 0.85, …
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Heat Transfer and Film Cooling Performance on a Transonic Converging Nozzle Guide Vane Endwall With Purge Jet Cooling and Dual Cavity Slashface Leakage
… hole jet cooling scheme provides additional purged coolant with consistent conditions throughout the investigation. The effects are measured in engine representative transonic mainstream and coolant flow conditions where Mexit = 0.85, Reexit = 1.5 × 106, freestream turbulence intensity of …
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Secondary air interaction with main flow in axial turbines
Secondary air, known as purge air, is injected through seals in the hub and shroud of axial turbines to prevent hot gas ingestion into the endwall cavities. An investigation into the interaction of purge ow with turbine main ow has been undertaken, to determine where losses are generated, how they …
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Impact of unsteady secondary air flow interaction with main flow on loss generation in axial turbines
Secondary air, often called purge air, is injected through the endwall gap between stationary vanes and rotating rotors in axial turbines to prevent ingestion of the hot working gas into the endwall cavities. Three-dimensional flow computations, unsteady as well as steady, have been carried out to …
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Computational assessment of turbine rim seal system parametric variation on hot gas ingestion and flow pattern
… stage efficiency. The parameters focused on are purge to main mass flow rate ratio, axial gap to rim radius ratio, radial gap to rim radius ratio, normalized axial position of the blade leading edge, and internal purge cavity radius ratios. The results were used to formulate a non-dimensional …
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Measurements of Cooling Effectiveness Along the Tip of a Turbine Blade
… turbine blade tip. Holes on the tip called dirt purge holes expel dirt from the blade, so other holes are not clogged. Wind tunnel tests are used to observe how effectively dirt purge and microcircuit designs cool the tip. Tip gap size and blowing ratio are varied for different tip cooling …
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Step Misaligned and Film Cooled Nozzle Guide Vanes at Transonic Conditions: Heat Transfer
… that upstream step misalignment and upstream purge film cooling have on the endwall heat transfer for nozzle guide vanes in a land based power generation gas turbine at transonic conditions. Endwall Nusselt Number and adiabatic film cooling effectiveness distributions were experimentally …
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Experimental and analytical assessment of cavity modes in a gas turbine wheelspace
… turbine engine operating conditions with purge flow. The experimental results and observations are complemented by computational assessments of cavity modes associated with flow in canonical cavity configurations. The cavity modes identified include Shallow Cavity modes and Helmholtz …
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Diversity and phylogenetic structure of two complex marine microbial communities
(cont.) competitive mechanisms are too weak to purge diversity from within them.
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Simulation studies to profile development and control of mixed-culture static and dynamic biofilms during extended raw beef processing operations using combinations of nanobubble water and peracetic acid
… organic matter added in the form of beef purge and were replenished daily with 20% (v/v) new solution and purge. Two important meat industry scenarios were simulated: static biofilm development (Chapter 3) and dynamic biofilm development using the Centers for Disease and Control (CDC) …
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Assessment of Scaling Rule for Hot Gas Ingestion in Representative Turbine Rim Seal System for Large Industrial Gas Turbines
… sealing parameter consists of the ratio of purge mass flow rate to a characteristic mass flow rate based on the rim seal geometry and rim speed, rotational Reynolds number, purge flow Reynolds number, rim-seal Reynolds number, and Rossby number. The geometry and operating conditions of the …
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Improving and Expanding the Capabilities of the Poly-Picosatellite Orbital Deployer
… capabilities like EMI shielding, an inert gas purge system, and an electrical interface to the CubeSats after they are integrated into the P-POD. Additionally, some mass reduction modifications are made to the P-POD, while its overall strength is increased. The P-POD inert gas purge system …
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A Multi-Site Comparison of Purging-Type Disorders
… of bulimia nervosa (BN), anorexia nervosa-binge/purge subtype (AN-B/P), and purging disorder (PD) patients. Data were collected from large multi-site centers in the US. Subjects (N = 2966) included current anorexia-binge/purge subtype (n = 138), current bulimia nervosa (n = 854), and current …
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The art of rank: a revaluation of John Dryden's satires
… satirist thus leads to his prescription of a purge to restore the State's good health. This burlesque image is in keeping with the traditional elements of satire, the intellectual and social environment of Restoration England, and also the conservative ideology of Dryden, for his purge …
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Film Cooling Predictions Along the Tip and Platform of a Turbine Blade
… channels. Parasitic losses included dirt purge holes, located along the blade tip, and platform leakage flow, which result from gaps between various turbine components. Microcircuits are a novel cooling technique involving small air passages placed near the airfoil surface to enhance …
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Aerodynamic performance of a transonic turbine blade passage in presence of upstream slot and mateface gap with endwall contouring
… operating conditions in presence of upstream purge slot and mateface gap. The upstream purge slot represents the gap between stator-rotor interface and the mateface gap simulates the assembly feature between adjacent airfoils in an actual high pressure turbine stage. While the performance of …
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