YaBeSH Digital Library: Recent submissions
Now showing items 13961-13980 of 316660
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A Reversible Miniaturized Tesla Valve
(The American Society of Mechanical Engineers (ASME), 2024)Tesla valves are passive fluid diodes originally proposed in 1920 by Nikola Tesla and consist of parallel tubes with bifurcated sections that rectify flow using fluid dynamics principles. Unlike conventional Tesla valves ... -
Effect of Fuel Reactivity and Operating Conditions on Flame Anchoring in the Premixing Zone of a Swirl Stabilized Gas Turbine Combustor
(The American Society of Mechanical Engineers (ASME), 2023)Flashback with subsequent flame anchoring (FA) is an inherent risk of lean premixed gas turbine combustors operated with highly reactive fuel. The present study has been performed to characterize flame stabilization in the ... -
Numerical Analysis of Flame Shape Impact on the Performance of Fuel Staging in a Lean-Burn Aeronautical Burner
(The American Society of Mechanical Engineers (ASME), 2023)The BIMER combustor is a lab-scale burner investigating fuel staging techniques as a stabilization strategy for lean premixed prevaporized combustion for aeronautical applications. Two stages compose its injection system: ... -
Reacting Flow Prediction of the Low-Swirl Lifted Flame in an Aeronautical Combustor With Angular Air Supply
(The American Society of Mechanical Engineers (ASME), 2024)The development of lean-burn combustion systems is of paramount importance for reducing the pollutant emissions of future aero engine generations. By tilting the burners of an annular combustor in circumferential direction ... -
Evaluation of Minimum NOx Emission From Ammonia Combustion
(The American Society of Mechanical Engineers (ASME), 2024)Ammonia (NH3) is being explored as a hydrogen carrier with no carbon emissions. However, if burned directly as NH3, rather than being completely decomposed back to N2/H2, the fuel-bound nitrogen comes with a potentially ... -
Integration of a Gas Model Into Computational Fluid Dynamics Analysis for the Simulation of Turbine Exhaust Flows With High Steam Loads
(The American Society of Mechanical Engineers (ASME), 2023)The water-enhanced turbofan (WET) is a promising future propulsion concept to reduce aero engine emissions. In the WET-engine, a heat exchanger uses turbine exhaust heat in order to generate superheated steam out of liquid ... -
The Hybrid Pathway to Flexible Power Turbines, Part II: Fast Data Transfer Methods Between Varying Fidelity Simulations, to Enable Efficient Conjugate Thermal Field Prediction
(The American Society of Mechanical Engineers (ASME), 2023)The global drive toward renewable energy is imposing challenging operating requirements on power turbines. Flexible load-leveling applications must accept more frequent and demanding start-stop cycles. Full transient ... -
Measurement of Temperature and Load Versus Bearing Displacement in a Thrust Foil Bearing: Differences Between Light Load and High Load Operation
(The American Society of Mechanical Engineers (ASME), 2023)This paper presents a test rig for evaluation of gas thrust foil bearings (GTFBs) and details measurements of load capacity conducted with a commercial GTFB comprising a single 360 deg, 0.127 mm thick top foil divided into ... -
A Literature Review of NOx Emissions in Current and Future State-of-the-Art Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2024)Current U.S. government policy seeks to achieve a completely carbon-free economy by 2050, with a carbon-free electricity sector by 2035 (per executive orders #14008 and #14057). To address these goals, the U.S. Department ... -
Analysis of Failure Forms of Bevel Gear, Shaft, and Bearing Structure System Considering Multi-Mode Damage Accumulation
(The American Society of Mechanical Engineers (ASME), 2023)During the working process, the structural system, including bevel gear, shaft, and bearing, located in the front journal of the high pressure compressor of the aeroengine rotor is affected by various loads such as assembly ... -
Predicting Premature Failures in Small Wind Turbines With Recurrence Plots
(The American Society of Mechanical Engineers (ASME), 2023)This paper presents the application of the recurrence plot as an alternative for preprocessing the raw data. The recurrence plots can extract the nonlinear and transient response and are sensitive to slight variations in ... -
In-Silico Model Validation of Impact on a Composite Helmet Shell
(The American Society of Mechanical Engineers (ASME), 2024)Numerical impact simulation plays a critical role in the development and improvement of helmet systems. Due to the curvature of the helmet, the selection of impact position on the helmet may affect the ability to correlate ... -
Integrated Aerodynamic and Mechanical Design of a Large-Scale Axial Turbine Operating With A Supercritical Carbon Dioxide Mixture
(The American Society of Mechanical Engineers (ASME), 2023)In this paper, the design of a large-scale axial turbine operating with supercritical carbon dioxide (sCO2) blended with sulfur dioxide (SO2) is presented considering aerodynamic and mechanical design aspects as well as ... -
Numerical Investigations of Near Surge Operating Conditions in a Two-Stage Radial Compressor With Refrigerant Gas
(The American Society of Mechanical Engineers (ASME), 2023)Modern compressor design targets require high performance and a wide operating range in order to reduce the environmental impact. To understand the fluid dynamics mechanisms that trigger instability, studying the system ... -
Manufacturing and Hydro Testing of a 10 MWe sCO2 Axial Turbine
(The American Society of Mechanical Engineers (ASME), 2023)Supercritical CO2 (sCO2) power cycles designed for thermodynamic efficiencies above 50% push component designs into pressure and temperature combinations that approach the limits of American Society of Mechanical Engineers ... -
Techno-Economic Analysis of a Physisorption-Based Hydrogen Storage System
(The American Society of Mechanical Engineers (ASME), 2023)Alternative long-term storage of energy is becoming increasingly important due to climate change. Hydrogen-based storage technologies have long been considered promising alternatives to batteries. However, the different ... -
Techno-Economic Analysis of the Solid Oxide Semi-Closed CO2 Cycle and Comparison With Other Power Generation Cycles With CO2 Capture
(The American Society of Mechanical Engineers (ASME), 2023)This work presents the techno-economic analysis of the solid oxide semi-closed CO2 cycle (SOS-CO2), a hybrid semi-closed cycle with solid oxide fuel cells (SOFC) recently developed by Politecnico di Milano for power ... -
Large Eddy Simulation of Soot Formation in a Real Aero-Engine Combustor Using Tabulated Chemistry and a Quadrature-Based Method of Moments
(The American Society of Mechanical Engineers (ASME), 2023)Considering the increasingly stringent targets for aircraft emissions, computational fluid dynamics (CFD) is becoming a viable tool for improving future aero-engine combustors. However, predicting pollutant formation remains ... -
Development of a Thermal Metrology Standard for Evaluation of Cold Plate Thermal Resistance as a Performance Metric
(The American Society of Mechanical Engineers (ASME), 2024)A significant number of investigations have been performed to develop and optimize cold plates for direct-to-chip cooling of processor packages. Many investigations have reported computational simulations using commercially ... -
Methodology to Characterize Row Manifolds for High Power Direct to Chip Liquid Cooling Data Centers
(The American Society of Mechanical Engineers (ASME), 2024)Demand is growing for the dense and high-performing IT computing capacity to support artificial intelligence, deep learning, machine learning, autonomous cars, the Internet of Things, etc. This led to an unprecedented ...