Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1441-1460 of 9564
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Low-Order Modeling to Investigate Clusters of Intrinsic Thermoacoustic Modes in Annular Combustors
(The American Society of Mechanical Engineers (ASME), 2021)The intrinsic thermoacoustic (ITA) feedbackloop constitutes a coupling between flow, flame and acoustics that does not involve the natural acoustic modes of the system. One recent study showed that ITA modes in annular ... -
Ignition Probability and Lean Ignition Behavior of a Swirled Premixed Bluff Body Stabilized Annular Combustor
(The American Society of Mechanical Engineers (ASME), 2021)An experimental investigation was performed in a premixed annular combustor equipped with multiple swirl, bluff body burners to assess the ignition probability and to provide insights into the mechanisms of failure and of ... -
Experimental and Numerical Investigations on the Leakage Flow Characteristics of Helical-Labyrinth-Brush Seals
(The American Society of Mechanical Engineers (ASME), 2021)The helical-labyrinth seal (HLS) can reduce rub between labyrinth teeth and rotor during the rotor vibration because the helical teeth on the stator and steps (or teeth) on the rotor are staggered in some positions. The ... -
Protection and Identification of Thermoacoustic Azimuthal Modes
(The American Society of Mechanical Engineers (ASME), 2021)This paper first characterizes the acoustic field of two annular combustors by means of data from acoustic pressure sensors. In particular, the amplitude, orientation, and nature of the acoustic field of azimuthal order n ... -
Dimensional Characterizations Using Scanning Electron Microscope and Surface Improvement With Electrochemical Polishing of Additively Manufactured Microchannels
(The American Society of Mechanical Engineers (ASME), 2021)Microchannel manufacturing is one of the fastest growing areas in advanced manufacturing with numerous applications, including turbine blade cooling structures, compact microchannel heat exchangers, and electronic cooling ... -
Static and Rotordynamic Characteristics for Two Types of Novel Mixed Liquid Damper Seals With Hole-Pattern/Pocket-Textured Stator and Helically Grooved Rotor
(The American Society of Mechanical Engineers (ASME), 2021)Noncontacting liquid annular seals, such as helical groove seals, are widely used at the impeller interstage and shaft end in the liquid turbomachinery to reduce the fluid leakage and stabilize the rotor-bearing system. ... -
Laminar Flame Speed Measurements of Kerosene-Based Fuels Accounting for Uncertainties in Mixture Average Molecular Weight
(The American Society of Mechanical Engineers (ASME), 2021)New laminar flame speed experiments have been collected for some kerosene-based liquid fuels: Jet-A, RP-1, and diesel fuel #2. Accurately understanding the combustion characteristics of these, and all kerosene-based fuels ... -
Static Performance of a Hydrostatic Thrust Foil Bearing for Large Scale Oil-Free Turbomachines
(The American Society of Mechanical Engineers (ASME), 2021)This work presents a novel design of a hydrostatic thrust foil bearing (HSTFB), with an outer diameter of 154 mm, along with simulation and test results up to a specific load capacity of 223 kPa (32.3 psi). This bearing ... -
Experimental Investigations of Superheated and Supercritical Injections of Liquid Fuels
(The American Society of Mechanical Engineers (ASME), 2021)Single- and multicomponent liquid fuels are injected in a jet-in-coflow configuration at elevated temperatures and pressures with both a custom plain orifice nozzle and a commercial pressure-swirl atomizer. The transitions ... -
Large Eddy Simulation of a Turbulent Spray Burner Using Thickened Flame Model and Adaptive Mesh Refinement
(The American Society of Mechanical Engineers (ASME), 2021)The accurate simulation of two-phase flow combustion is crucial for the design of aeronautical combustion chambers. In order to gain insight into complex interactions between a flame, a flow, and a liquid phase, the present ... -
Some Observations on the Computational Sensitivity of Rotating Cavity Flows
(The American Society of Mechanical Engineers (ASME), 2021)Across the open literature, there is no clear consensus on what the most suitable modeling fidelity is for rotating cavity flows. Although it is a widely held opinion that unsteady Reynolds-averaged-Navier–Stokes (URANS) ... -
Durable Abrasive Tip Design for Single Crystal Turbine Blades
(The American Society of Mechanical Engineers (ASME), 2021)In order to create and maintain peak efficiency in turbine stages, it is useful to minimize hot air leakage over blade tips. For unshrouded blades, this means creating minimal clearance over the airfoil tip with rub-tolerate ... -
Tip Leakage Flow Instability in a Centrifugal Compressor
(The American Society of Mechanical Engineers (ASME), 2021)In this paper, an unsteady tip leakage flow phenomenon is identified and investigated in a centrifugal compressor with a vaneless diffuser at near-stall conditions. This phenomenon is associated with the inception of a ... -
Flame Transfer Functions and Dynamics of a Closely Confined Premixed Bluff Body Stabilized Flame With Swirl
(The American Society of Mechanical Engineers (ASME), 2021)The flame transfer function (FTF) and flame dynamics of a highly swirled, closely confined, premixed flame is studied over a wide range of equivalence ratios and bulk velocities at a fixed perturbation level at the dump ... -
Test Results for the Static and Rotordynamic Characteristics of a Long (L/D = 0.75) Smooth Seal in Two-Phase (Mainly Gas) Conditions With a 62-Bar Inlet Pressure
(The American Society of Mechanical Engineers (ASME), 2021)Recent multiphase-pump developments encountered several rotordynamic issues with smooth balance-piston seals, creating a need to better understand the performance of annular seals under multiphase-flow operation. This paper ... -
Hybrid Numerical-Experimental Model Update Based on Correlation Approach for Turbine Components
(The American Society of Mechanical Engineers (ASME), 2021)Bladed-disks in turbomachines experience high cycle fatigue failures due to high vibration amplitudes. Therefore, it is important to accurately predict their dynamic characteristics including the mechanical joints at ... -
Can Water Dilution Avoid Flashback on a Hydrogen-Enriched Micro-Gas Turbine Combustion?—A Large Eddy Simulations Study
(The American Society of Mechanical Engineers (ASME), 2021)Considering the growing interest in Power-to-Fuel, i.e., production of H2 using electrolysis to store excess renewable electricity, combustion-based technologies still have a role to play in the future of power generation. ... -
Implications of Phase Change on the Aerodynamics of Centrifugal Compressors for Supercritical Carbon Dioxide Applications
(The American Society of Mechanical Engineers (ASME), 2021)Closed Joule–Brayton cycles operating with carbon dioxide in supercritical conditions (sCO2) are nowadays collecting a significant scientific interest, due to their high potential efficiency, the compactness of their ... -
Complex Energy Networks Optimization: Part II—Software Application to a Case Study
(The American Society of Mechanical Engineers (ASME), 2021)In order to increase the exploitation of the renewable energy sources, the diffusion of the distributed generation systems is grown, leading to an increase in the complexity of the electrical, thermal, cooling, and fuel ... -
Complex Energy Networks Optimization: Part I—Development and Validation of a Software for Optimal Load Allocation
(The American Society of Mechanical Engineers (ASME), 2021)The growing diffusion of the distributed generation systems, due to the European and national legislations which impose the fossil fuel and greenhouse gas emissions reduction and the renewable sources exploitation, have ...