Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1021-1040 of 9564
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Experimental Study of Various Low-Friction Coatings for High-Temperature Gas Foil Bearings Under Cold-Start Conditions
(The American Society of Mechanical Engineers (ASME), 2022)This article presents the experimental research carried out on five different materials with which the top foils have been coated. A foil bearing with these foils was tested under different load conditions. The key operating ... -
Erratum: “The Band Gap Formation in Rotors With Longitudinal Periodicity and Quasi-Periodicity” [ASME J. Eng. Gas Turbines Power, 2022, 144(5), p. 051003; DOI: 10.1115/1.4053193]
(The American Society of Mechanical Engineers (ASME), 2022)Equation (10) gives ∑j=1nf(xj)≈1Δx∫0Lf(x) dxwhere f(xj)=mjρALϕi(xj)ϕk(xj)Considering that all disks have the same mass mD, then f(xj)=mDρALϕi(xj)ϕk(xj)Hence, from Eq. (10) (11)∑j=1NDmDρALϕi(xj)ϕk(xj)≈1Δx∫0LmDρALϕi(x)ϕk(x ... -
Gradient-Free Optimization in Thermoacoustics: Application to a Low-Order Model
(The American Society of Mechanical Engineers (ASME), 2022)Machine learning and automatized routines for parameter optimization have experienced a surge in development in the past years, mostly caused by the increasing availability of computing capacity. Gradient-free optimization ... -
Effect of Counter- and Co-Swirl on Low-Frequency Combustion Instabilities of Jet A-1 Spray Flames
(The American Society of Mechanical Engineers (ASME), 2022)The present article experimentally investigates the influence of pilot swirling directions on low-frequency combustion instabilities of pilot diffusion flames in a laboratory-scale combustor with jet A-1 fuel and air at ... -
Automatized Experimental Combustor Development Using Adaptive Surrogate Model-Based Optimization
(The American Society of Mechanical Engineers (ASME), 2022)Lean premixed combustion is the state-of-the-art technology to achieve ultra low NOx emissions in stationary gas turbines. However, lean premixed flames are susceptible to thermoacoustic instabilities, lean blowout, and ... -
Approximating Gas Turbine Combustor Exit Temperature Distribution Factors Using Spatially Under-Sampled Measurements
(The American Society of Mechanical Engineers (ASME), 2022)In gas turbine engines, the temperature field at the exit plane of the combustor is highly unsteady and complex, with large radial and circumferential variations. The circumferential temperature variations (hot-streaks) ... -
Blisk With Small Geometry Mistuning and Blend Repair: As-Measured Finite Element Model and Experimental Verification
(The American Society of Mechanical Engineers (ASME), 2022)This paper presents an “As-Measured Model” (AMM) of a blended blisk, built upon the measurement of the true geometry of the blisk by the three-dimensional optical scanning technology. This high-fidelity model aims to account ... -
Integrated Aerodynamic and Structural Blade Shape Optimization of Axial Turbines Operating With Supercritical Carbon Dioxide Blended With Dopants
(The American Society of Mechanical Engineers (ASME), 2022)Within this study, the blade shape of a large-scale axial turbine operating with sCO2 blended with dopants is optimized using an integrated aerodynamic-structural three-dimensional (3D) numerical model, whereby the ... -
Computational and Experimental Assessment of a MW-Scale Supercritical CO2 Compressor Operating in Multiple Near-Critical Conditions
(The American Society of Mechanical Engineers (ASME), 2022)This work illustrates the results of a wide experimental campaign in the frame of the EU-funded project sCO2-Flex, which focused on the investigation of a MW-scale sCO2 compressor operating in plant-representative conditions. ... -
Modeling Power Constraints Using Maps and Field Data in Optimization Problems for Gas Transportation Systems
(The American Society of Mechanical Engineers (ASME), 2022)Gas transmission networks have been and continue to be the most efficient method for transporting natural gas. As hydrogen begins to emerge as one possible solution of renewable energy and starts mixing into gas networks, ... -
Accurate Prediction of Confined Turbulent Boundary Layer Flashback Through a Critically Strained Flame Model
(The American Society of Mechanical Engineers (ASME), 2022)A novel boundary layer flashback model is developed based on previous measurements that showed flashback limits may be related to strained premixed flame extinction. According to the model, flashback occurs at the equivalence ... -
Optimization of an Organic Ranking Cycle Radial Turbine Using a Reduced-Order Model Coupled With Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2022)This paper presents the geometry optimization of a single stage radial turbine for an organic ranking cycle (ORC) system operating over a pressure ratio of 9. The specific fluid used in this investigation is R1233zd (E), ... -
Multifidelity Simulation Research on the Low Reynolds Number Effect on the Engine Performance at Different Altitudes
(The American Society of Mechanical Engineers (ASME), 2022)With the rapid development of unmanned aerial vehicles, the effect of the low Reynolds number on gas turbine performance and high-altitude endurance has received extensive attention. However, the existing three-dimensional ... -
Microtomography of Soil and Soot Deposits: Analysis of Three-Dimensional Structures and Surface Morphology
(The American Society of Mechanical Engineers (ASME), 2022)The detrimental effects generated by the gas turbine fouling phenomenon are well known. Due to soil and soot particles ingestion, gas turbines experience performance drops related to greater fuel consumption and even lower ... -
Estimation of Autoignition Propensity in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor Network Modeling
(The American Society of Mechanical Engineers (ASME), 2022)The study of autoignition propensity in premixers for gas turbines is critical for their safe operation and design. Although premixers can be analyzed using reacting computational fluid dynamics (CFD) coupled with detailed ... -
Forced Response System Identification of Full Aero-Engine Rotordynamic Systems for Prognostics and Diagnostics
(The American Society of Mechanical Engineers (ASME), 2022)A first-of-its-kind forced-response system identification approach is introduced to measure rotordynamic damping of shaft modes in a full gas turbine aero-engine. The approach involves forced-response modal analysis in ... -
Hydrogen Thermal-Powered Aircraft Combustion and Propulsion System
(The American Society of Mechanical Engineers (ASME), 2022)This article presents an assessment study of the propulsion system, the fuel distribution system, and the injector/combustor technologies enabling to eliminate of CO2 emissions in aviation. In addition, the discussion is ... -
Multifidelity Optimization Under Uncertainty for Robust Design of a Micro-Turbofan Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2022)This paper presents a multifidelity optimization strategy for efficient uncertainty quantification and robust optimization applicable to turbomachinery blade design. The proposed strategy leverages freeform parameterization ... -
Self-Excited Second-Order Azimuthal Thermoacoustic Instabilities in an Annular Combustor With Oblique-Injecting Swirling Burners
(The American Society of Mechanical Engineers (ASME), 2022)In this paper, we experimentally investigate the thermoacoustic instability issue in an annular combustor with 16 oblique-injecting premixed swirling burners. It is demonstrated that there exist three dominant modes in a ... -
Off-Design Modeling and Operational Optimization of Trans-Critical Carbon Dioxide Heat Pumps
(The American Society of Mechanical Engineers (ASME), 2022)Industrial heat pumps, and specifically those using carbon dioxide (CO2) as a refrigerant, can play a key role in the decarbonization of the heating and cooling sector, due to their low global warming potential, toxicity ...