Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 841-860 of 9564
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Numerical Investigation of a Coupled Blow-Off/Flashback Process in a High-Pressure Lean-Burn Combustor
(The American Society of Mechanical Engineers (ASME), 11/28/2022)Large eddy simulation is used to investigate the flashback mechanism caused by the combustion-induced vortex breakdown (CIVB) in a high-pressure lean-burn annular combustor with lean direct injection of kerosene. A single ... -
Enhancement of Low Operating Load Limit and Engine Characteristics by Hydrogen Addition in a Biogas-Fueled Spark-Ignition Engine
(The American Society of Mechanical Engineers (ASME), 11/28/2022)Biogas is a renewable gaseous fuel and has the potential to replace fossil fuels for spark-ignition engines; however, a higher volumetric proportion of CO2 in biogas degrades the engine characteristics significantly. Biogas ... -
Hysteresis and Bistability in Transversely Excited Swirling Flows
(The American Society of Mechanical Engineers (ASME), 10/21/2022)We investigate the effect of transverse acoustic excitation on nonreacting swirling jets. The work is motivated by the azimuthal instabilities in annular gas turbine combustor which are one of the major challenges in ... -
Influence of Geometric Parameters for a 100 kW Inward Flow Radial Supercritical CO2 Turbine
(The American Society of Mechanical Engineers (ASME), 10/21/2022)Highly compact and efficient design makes inward flow radial (IFR) turbine a preferred choice for kilowatt scale supercritical CO2 (sCO2) power blocks. The influence of geometric design parameters on sCO2 turbine performance ... -
Application of Machine Learning to Forced Response Predictions of an Industrial Axial Compressor Rotor Blade
(The American Society of Mechanical Engineers (ASME), 10/21/2022)Machine learning has gone way beyond a ground-breaking technology a few decades ago to now taken for granted in many day-to-day activities. It is now providing new ways for manufacturing, assembling, operating, monitoring, ... -
High-Frequency Mode Shape Dependent Flame-Acoustic Interactions in Reheat Flames
(The American Society of Mechanical Engineers (ASME), 10/20/2022)Gas turbines featuring sequentially staged combustion systems offer excellent performance in terms of fuel flexibility, part load performance and combined-cycle efficiency. These reheat combustion systems are therefore a ... -
Static and Rotordynamic Characteristics for Supercritical Carbon Dioxide Spiral Groove Dry Gas Seal With the Tilted Seal Ring
(The American Society of Mechanical Engineers (ASME), 10/20/2022)Supercritical carbon dioxide (SCO2) Brayton cycle has been widely used as a substitute for traditional steam cycles. As one of the key components of power-dense turbomachines, dry gas seal (DGS) has been considered one of ... -
Performance Optimization of Semi-Closed Oxy-Combustion Combined Cycle for Current and Future Blade Materials
(The American Society of Mechanical Engineers (ASME), 10/19/2022)Among the technologies for carbon capture and storage (CCS) from natural gas, oxy-turbine plants are a very promising solution thanks to the high efficiency, absence of stack, and nearly 100% capture rate. This paper ... -
A Mechanistic Model for the Predictive Maintenance of Heavy-Duty Centrifugal Fans Operating With Dust-Laden Flows
(The American Society of Mechanical Engineers (ASME), 10/19/2022)Heavy-duty centrifugal fans are employed for the transport of dust-laden flows in industrial plants, for cement or steel production, or in energy production of plants and mine ventilation systems. These applications require ... -
A Stepped Shaft Labyrinth Seal Verses A Pocket Damper Seal: Leakage and Dynamic Force Coefficients Under Wet Gas Operation
(The American Society of Mechanical Engineers (ASME), 10/19/2022)Modern turbomachinery favors pocket damper seals (PDS) which produce more effective damping than labyrinth seals (LS). Liquid tolerant compressors enable deep sea oil and gas (O&G) facilities; and seals supplied with ... -
From Pressure Time Series Data to Flame Transfer Functions: A Framework for Perfectly Premixed Swirling Flames
(The American Society of Mechanical Engineers (ASME), 10/19/2022)We present a two-step optimization (TSO) framework, which uses the pressure data of an unstable combustion process to estimate the complex-valued flame transfer function (FTF). From the pressure time series, we obtain the ... -
Roller Bearing Skidding for Aero-Engine Applications: All-Steel Versus Hybrid Bearings
(The American Society of Mechanical Engineers (ASME), 10/19/2022)Roller bearings operating under light loads may suffer from skidding. The latter is more pronounced as the speed increases and may result in extensive wear and reduced service life of the bearing. The main objective of ... -
Nonlinear Dynamics of Turbine Generator Shaft Trains: Evaluation of Bifurcation Sets Applying Numerical Continuation
(The American Society of Mechanical Engineers (ASME), 10/19/2022)The nonlinear dynamics of turbine generator shaft trains for power generation are investigated in this paper. Realistic models of rotors, pedestals, and nonlinear bearings of partial arc and lemon bore configuration are ... -
An Experimental Investigation on the Dynamic Response Variability of a Turbine Blade With Midspan Dampers
(The American Society of Mechanical Engineers (ASME), 10/19/2022)This paper addresses two main subjects. First, a novel test setup is described to experimentally study the nonlinear dynamic behavior of a turbine blade coupled with two midspan dampers (MSDs). To this end, a representative ... -
Axial Compressor Map Generation Leveraging Autonomous Self-Training Artificial Intelligence
(The American Society of Mechanical Engineers (ASME), 10/19/2022)The paper describes the study performed by SoftInWay in the scope of the Phase I SBIR project funded by the National Aeronautics and Space Administration (NASA). The project was dedicated to a study of optimization of the ... -
Turbulent Flow and Heat Transfer Enhancement for Turbine Blade Trailing Edge Cooling With Gyroid-Type Triply Periodic Minimal Surfaces
(The American Society of Mechanical Engineers (ASME), 2023)The Gyroid is a type of triply periodic minimal surface (TPMS) that has interconnected, perfectly curved topologies and excellent thermomechanical properties. Due to its topological feature to enhance heat transfer and ... -
Comparative Analysis of Infrared Signatures of Turbofan Engine Exhaust System With or Without Afterburning
(The American Society of Mechanical Engineers (ASME), 2023)The flow fields and infrared signatures of a turbofan engine axisymmetric exhaust system with or without afterburning have been numerically investigated. The flow fields of the exhaust system have been calculated using a ... -
Numerical Investigation on the Characteristics of a Novel Multi-Swirl Lean Direct Injection Burner With Large Eddy Simulation-Flamelet Generated Manifold Method
(The American Society of Mechanical Engineers (ASME), 2023)The lean direct injection (LDI) concept can eventually replace the current combustion systems in aviation engines because of its low NOx emissions without compromising other parameters. A novel multiswirl LDI burner with ... -
Kriging-Based Surrogate Controller for Robust Control of a Flexible Rotor Supported by Active Magnetic Bearings
(The American Society of Mechanical Engineers (ASME), 2023)Vibration control in supercritical rotors is a challenging task due to the underlying complex dynamics that high-speed machinery undergoes. When taking into account both structural (e.g., structural integrity and material ... -
Estimation of Wiebe Function Parameters for Syngas and Anode Off-Gas Combustion in Spark-Ignition Engines
(The American Society of Mechanical Engineers (ASME), 2023)Wiebe functions, analytical equations that estimate the fuel mass fraction burned (MFB) during combustion, have been effective at describing spark-ignition (SI) engine combustion using gasoline fuels. This study explores ...