Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 981-1000 of 9564
-
Experimental Investigation of Interactions Between Two Closely Spaced Azimuthal Modes in a Multinozzle Can Combustor
(The American Society of Mechanical Engineers (ASME), 2022)Thermoacoustic instabilities in annular or circular combustors are often coupled with azimuthal modes. These modes can be characterized by a spin ratio (SR), which quantifies the dominant mode between two counterrotating ... -
A Probabilistic Model for Forging Flaw Crack Nucleation Processes for Heavy Duty Gas Turbine Rotor Operations
(The American Society of Mechanical Engineers (ASME), 2022)We present a probabilistic model for quantifying the number of load cycles for nucleation of forging flaws—for a 3.5NiCrMoV high strength low alloy rotor steel—into a crack under gas turbine operating conditions. The model ... -
Refinement of a High Cycle Fatigue DecisionGate Assessment for Additively Repaired Blades
(The American Society of Mechanical Engineers (ASME), 2022)A recently developed high cycle fatigue (HCF) acceptance criteria demonstrates effectiveness in assessing the viability of two laser directed energy deposition (DED) repair processes on titanium 6Al4V (Ti 6Al4V) fan blades. ... -
Life Cycle Assessment for Rough Machining of Inconel 718 Comparing Ceramic to Cemented Carbide End Mills
(The American Society of Mechanical Engineers (ASME), 2022)Nickelbased alloys such as Inconel 718 belong to the group of heatresistant super alloys. Combined with good mechanical properties over a wide range of temperatures, nickel alloys are used extensively in the aero engine ... -
Large Eddy Simulation Investigation of Low Rossby Number Buoyant Flow in Rotating Cavities
(The American Society of Mechanical Engineers (ASME), 2022)Flow and heat transfer in axial compressor disk cavities involve strong interaction of axial throughflow at the disk bores with centrifugal buoyant flow in the cavities. This paper presents large eddy simulation (LES) of ... -
Aeroacoustic Interactions of Blade Skew and Leading Edge Serrations Applied to LowPressure Axial Fans
(The American Society of Mechanical Engineers (ASME), 2022)Leading edge serrations are well known for their ability to reduce turbulenceinduced noise of single airfoils while also providing aerodynamic advantages under certain operating conditions. Continuatively, applying leading ... -
Investigations on the Aerodynamic Performance of a Gas Turbine Exhaust Diffuser With the Modified Shell Profile
(The American Society of Mechanical Engineers (ASME), 2022)In this paper, a shell profile design method based on diffuser flow area curve is proposed to improve the static pressure recovery coefficient of the exhaust diffuser over a range of inlet swirl angles. Based on verifying ... -
Investigation of a HighPressure Turbine Stage in a HighSpeed Rotating Transient Test Facility for Rotor Tip Study and a Parametric Study for Improved Heat Transfer Calculation
(The American Society of Mechanical Engineers (ASME), 2022)The first part of the paper presents commissioning of a singlestage highpressure (HP) turbine employed in a series of extensive experiments to study the aerodynamics and heat transfer on the rotor surface and casing liner. ... -
Numerical Predictions of Mean Performance and Dynamic Behavior of a 10 MWe SCO2 Compressor With Test Data Validation
(The American Society of Mechanical Engineers (ASME), 2022)Highfidelity aerodynamic analysis has been demonstrated for mean performance and unsteady dynamics in a sCO2 compressor designed by Hanwha Power Systems Americas for a 10 MWe Concentrating Solar Power plant. Simulations ... -
Effect of Compressor Unsteady Wakes on a Gas Turbine Combustor Flow
(The American Society of Mechanical Engineers (ASME), 2022)In gas turbines, combustor inlets are characterized by significant levels of unsteady circumferential distortion due to compressor wakes and secondary flows, together with additional radial nonuniformity induced by the ... -
Estimation of Resultant Airframe Forces for a Variable Pitch Fan Operating in Reverse Thrust Mode
(The American Society of Mechanical Engineers (ASME), 2022)The resultant forces with a reverse thrust variable pitch fan (VPF) during the aircraft landing run are computed from the installed reverse thrust flow field obtained from an airframeengineVPF research model. The research ... -
Unsteady Investigation of the Effect of Purge Air on the Flow Field Inside a Turbine Vane Frame Using Particle Image Velocimetry
(The American Society of Mechanical Engineers (ASME), 2022)Reducing greenhouse gas emissions and high fuel expenses motivates manufacturers to design more efficient aircraft engines. For directly driven jet engines, this is possible through increased bypass ratios for high propulsive ... -
Interplay of Clusters of Acoustic and Intrinsic Thermoacoustic Modes in CanAnnular Combustors
(The American Society of Mechanical Engineers (ASME), 2022)Thermoacoustic systems can exhibit selfexcited instabilities of two nature, namely cavity modes or intrinsic thermoacoustic (ITA) modes. In heavyduty landbased gas turbines with canannular combustors, the crosstalk between ... -
Gas Turbine Combined Cycle Range Enhancer—Part 2: Performance Demonstration
(The American Society of Mechanical Engineers (ASME), 2022)In the current energy scenario, gas turbine combined cycles (GTCCs) are considered key drivers for the transition towards fossilfree energy production. However, to meet this goal, they must be able to cope with rapid changes ... -
On the Pneumatic Hammer of Hybrid Gas Bearings: Measurements and Predictions
(The American Society of Mechanical Engineers (ASME), 2022)Hybrid bearings integrating an external pressurizing source are widely used in highspeed turbomachinery due to their notable advantages, including low friction and wear, enhanced reliability and durability, and accurate ... -
Design Methodology and Concept Demonstration of Preassembled Additively Manufactured Turbomachinery Systems: Case Study of Turbocharger Based Medical Ventilators
(The American Society of Mechanical Engineers (ASME), 2022)The present research focuses on analyzing the feasibility of manufacturing complex turbomachinery geometries in a preassembled manner through an uninterrupted additive manufacturing process, absent of internal support ... -
The Ignition of C1–C7 Natural Gas Blends and the Effect of Hydrogen Addition in the Low and High Temperature Regimes
(The American Society of Mechanical Engineers (ASME), 2022)New ignition delay time (IDT) measurements for two natural gas (NG) blends composed of C1–C7nalkanes, NG6 (C1:60.625%, C2:20%, C3:10%, C4:5%, nC5:2.5%, nC6:1.25%, nC7:0.625%) and NG7 (C1:72.635%, C2:10%, C3:6.667%, C4:4.444%, ... -
Investigating the Mixture Quality in MultiInjector Burner Systems—Part I: Experimental Setup
(The American Society of Mechanical Engineers (ASME), 2022)A new approach to calculate the mixture statistics in multiinjector burner (MIB) systems from a single injector database is presented in the paper. In such systems, the mixture quality is highly sensitive to the flowrate ... -
Restitution of Impacting Projectiles in Ceramic Matrix Composites Subject to Foreign Object Damage
(The American Society of Mechanical Engineers (ASME), 2022)Accurate assessments of rebound velocity of a projectile in impact events for ceramic matrix composites (CMCs) are important since the rebound velocity affects the degree of resultant impact damage in both CMC targets and ... -
Quantification of Autoignition Risk in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor and Surrogate Modeling
(The American Society of Mechanical Engineers (ASME), 2022)The design and operation of premixers for gas turbines must deal with the possibility of relatively rare events causing dangerous autoignition (AI). Rare AI events may occur in the presence of fluctuations of operational ...