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Showing 1 to 20 of 20 for “"Turbine Cooling"”.
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Complementary velocity and heat transfer measurements in a rotating turbine cooling passage
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Experimental investigation of leading edge jet impingement with varying jet geometries and inlet supply conditions for turbine cooling applications.
… employed within the leading edge of modern gas turbine airfoils to combat the extreme heat loads incurred within this region. This experimental investigation employs a transient liquid crystal technique to obtain detailed Nusselt number distributions on a concave, cylindrical surface that models …
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Assessment of shaped film cooling holes at high density ratios for gas turbine cooling using S-PIV and PSP.
During film-hole cooling, relatively cold air is extracted from the compressor of a gas turbine engine and forced through the turbine airfoils in order to lower their surface temperatures. To investigate the effects of various film cooling hole geometries on film-cooling hole performance, shaped …
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Investigation of Particle Trajectories for Wall Bounded Turbulent Two-Phase Flows
… the ingestion of foreign debris into a gas turbine engine, provided the impetus for this study. Despite more than 40 years of research, operation with a particle-laden inlet flow remains a significant problem for modern turbomachines. The purpose, therefore, is to develop experimental …
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Validation of a CFD Approach for Gas Turbine Internal Cooling Passage Heat Transfer Prediction
… Dynamics (CFD) modelling approach for internal cooling passages in rotating turbomachinery. A CFD Modelling approach and accompanying assumptions are tuned and validated against academically available experimental results for various serpentine passages. Criteria of the CFD modelling approach …
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An assessment of the aerodynamic, thermodynamic, and manufacturing issues for the design, development, and microfabrication of a demonstration micro engine
… devices for power conversion. Micro gas turbine engines (microengines) are one particular application of this technology. These tiny jet engines have immediate application as propulsion systems for Micro UAVs Other envisioned applications include portable electrical power generation for …
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The Design of Aspirated Compressor Bleed
… from part way through the compressor for use in turbine cooling and other operational applications. Typical bleed systems in Industrial Gas Turbines comprise of an annular slot in the compressor casing, leading to external cavities. Aspiration refers to a form of flow control that utilises small …
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Onset of Arizona Road Dust in High Temperature Environment on a Cooled HASTELLOY X Surface
… and ash particulates ingestion study for gas turbine engine applications. Recently, there has been an increase in commercial and military fleets operating in medium to highly dusty environments, such as areas in Africa, the Middle East, and Asia. Dusty environments can cause blockage in …
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A Performance Study of a Super-cruise Engine with Isothermal Combustion inside the Turbine
… isothermal combustion inside the high-pressure turbine (High-Pressure Turburner, HPTB) as an alternative form of thrust augmentation. A cycle analysis computer program is developed for accurate prediction of the engine performance and a supersonic transport cruising at Mach 2 at 60,000 ft is …
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Analysis of film cooling performance of tripod hole
The thermal efficiency of a gas turbine directly depends on the rotor inlet temperature. The ever increasing demand for more power and advances in the field of engineering enabled this temperature to be pushed higher. But the material strength of the blades and vanes can often impose restrictions …
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Design, Analysis, and Development of a Tripod Film Cooling Hole Design for Reduced Coolant Usage
… focus on improving the effectiveness of the film cooling technique through the use of a new approach to film cooling. This new approach uses a set of three holes sharing the same inlet and diverging from the central hole to form a three-legged, or tripod, design. The tripod design is examined in …
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Development of Advanced Internal Cooling Technologies for Gas Turbine Airfoils under Stationary and Rotating Conditions
Higher turbine inlet temperatures (TIT) are required for higher overall efficiency of gas turbine engines. Due to the constant push towards achieving high TIT, the heat load on high pressure turbine components has been increasing with time. Gas turbine airfoils are equipped with several …
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Heat Transfer Performance Improvement Technologies for Hot Gas Path Components in Gas Turbines
… few decades, the operating temperatures of gas turbine engines have increased significantly with a view towards increasing the overall thermal efficiency and specific power output. As a result of increased turbine inlet temperatures, the hot gas path components downstream of the combustor …
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Experimental Investigation of Temperature Effects on Microparticle Sand Rebound Characteristics at Gas Turbine Representative Conditions
When a gas turbine operates in a particle laden environment, such as a desert, small solid particles are ingested into the engine. The ingested sand particles can cause damage to engine components and reduce the service life of the engine. Particle ingestion causes the erosion of metal blades and …
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Study Of Heat Transfer Characteristics Of Impinging Air Jet Using Pressure Andn Temperature Sensitive Luminescent Paint
Luminescent coating measurement system is a relatively new technology for quantitative pressure and temperature measurement. Usually referred to as Pressure Sensitive Paint (PSP) and Temperature Sensitive Paint (TSP), luminescent coatings contain sensor molecules, which undergoes a luminescent …
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Heat Transfer Augmentation Surfaces Using Modified Dimples/Protrusions
… exchangers and Part II (Chapter 5) for internal cooling of rotating turbine blades. Part I consists of three phases: Phase I (Chapter 2) investigates flow structure and heat transfer distribution in a channel with dimples/protrusions; Phase II (Chapter 3) studies the application of dimples as …
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Detailed Experimental Measurements of Heat Transfer Augmentation in Internal Channels Using a Thermochromic Liquid Crystal Technique
Design of internal cooling channels for gas turbine blade is critical to system performance. To achieve maximum efficiency, i.e. maximum cooling with minimum coolant usage, intensive research is required to optimize heat transfer enhancement features. The present study aims at experimental and …
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Heat Transfer to Arrays of Oscillating Impingement Jets
<p>In gas turbine engines, the desire to increase turbine entry temperatures has become more relevant in order to increase engine efficiency. However, materials used in these engines can only withstand temperatures that are so high. Because of this, the ability to cool hot section components will …
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Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique
… have a significant impact in design of gas turbine airfoils and other rotating components such as generator windings. The effects of the Coriolis acceleration and centrifugal buoyancy have a significant impact on heat transfer behavior inside such rotating coolant channels due to the complex …
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Investigation into the optimal cooling configuration for a gas turbine airfoil utilizing a thermal barrier coating
The overall cooling effectiveness of a gas turbine airfoil characterizes the conjugate effect of both film cooling and internal cooling on an airfoil in one parameter. Few studies in open literature have explored the overall cooling effectiveness of airfoil's utilizing a thermal barrier coating. In …