Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1481-1500 of 9564
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Nonlinear Modal Analysis of Frictional Ring Damper for Compressor Blisk
(The American Society of Mechanical Engineers (ASME), 2021)The use of integrally blisk is becoming popular because of the advantages in aerodynamic efficiency and mass reduction. However, in an integrally blisk, the lack of the contact interface leads to a low structural damping ... -
Effect of Different Fuels on Combustion Instabilities in an Annular Combustor
(The American Society of Mechanical Engineers (ASME), 2021)Combustion instability in annular combustors of jet engines is a recurring issue. In this study, the characteristics of instabilities for different fuels are investigated by combining the instability maps obtained in a ... -
Partial Premixing Effects on the Reacting Jet of a High-Pressure Axially Staged Combustor
(The American Society of Mechanical Engineers (ASME), 2021)The effects of partial premixing on a reacting jet-in-crossflow is investigated in a five atmosphere axially staged combustor at stationary gas turbine relevant conditions. The facility consists of a dump style headend ... -
Experimental Investigations on the Pressure Fluctuations in the Sealing Gap of Dry Gas Seals With Embedded Pressure Sensors
(The American Society of Mechanical Engineers (ASME), 2021)Dry gas–lubricated noncontacting mechanical seals (DGSs), most commonly found in centrifugal compressors, prevent the process of gas flow into the atmosphere. Especially when high speed is combined with high pressure, DGS ... -
Environmental Barrier Coating Oxidation and Adhesion Strength
(The American Society of Mechanical Engineers (ASME), 2021)Plasma spray-physical vapor deposition (PS-PVD) environmental barrier coatings (EBCs) of Yb2Si2O7 were deposited on SiC and exposed in a steam environment (90% H2O/O2) at 1426 °C to form a thermally grown oxide (TGO) layer ... -
On the Effect of Clearance on the Leakage and Cavity Pressures in an Interlocking Labyrinth Seal Operating With and Without Swirl Brakes: Experiments and Predictions
(The American Society of Mechanical Engineers (ASME), 2021)Gas labyrinth seals (LSs) improve turbomachinery operational efficiency and mechanical reliability by reducing secondary leakage. As interlocking labyrinth seals (ILSs) restrict more leakage than conventional see-through ... -
On the Leakage and Dynamic Force Coefficients of a Novel Stepped Shaft Pocket Damper Seal: Experimental and Numerical Verification
(The American Society of Mechanical Engineers (ASME), 2021)High-performance turbomachinery favors annular seals with a large damping coefficient to ensure rotor system stability. Pocket damper seals (PDSs), a variation of labyrinth seals with axial blades (ribs) and adding ... -
Simulation of Premixed and Partially Premixed Jet-in-Crossflow Flames at High Pressure
(The American Society of Mechanical Engineers (ASME), 2021)In this paper, we explore the operational map of a lean axial-staged combustor of premixed and partially premixed reacting jet-in-crossflow flames at high -pressure (5 atm). This study attempts to expand the data to ... -
Topological Optimization of Under-Platform Dampers With Moving Morphable Components and Global Optimization Algorithm for Nonlinear Frequency Response
(The American Society of Mechanical Engineers (ASME), 2021)To limit the risk of high cycle fatigue, underplatform dampers (UDPs) are traditionally used in aircraft engines to control the level of vibration. Many studies demonstrate the impact of the geometry of the damper on its ... -
On the Efficiency of a Conical Underplatform Damper for Turbines
(The American Society of Mechanical Engineers (ASME), 2021)Underplatform dampers (UPDs) are commonly used in aircraft engines to limit the risk of high-cycle fatigue of turbine blades. The latter is located in a groove between two consecutive blades. The dry friction contact ... -
Numerical and Analytical Investigation of Heat Transfer Mechanisms and Flow Phenomena in an Intermediate Pressure Steam Turbine Blading During Startup
(The American Society of Mechanical Engineers (ASME), 2021)As a result of an ever-increasing share of volatile renewable energies on the worldwide power generation, conventional thermal power plants face high technical challenges in terms of operational flexibility. Consequently, ... -
Development of Experimental and Numerical Methods for the Analysis of Active Clearance Control Systems1
(The American Society of Mechanical Engineers (ASME), 2021)The ever increasing performance requirements of modern aeroengines necessitate the development of effective ways to improve efficiency and reduce losses. Casing temperature control is particularly critical from this point ... -
Coupled Mode Flutter Analysis of Turbomachinery Blades Using an Adaptation of the p–k Method
(The American Society of Mechanical Engineers (ASME), 2021)Current trends in turbomachinery design significantly reduce the mass ratio of structure to air, making them prone to flutter by aerodynamic coupling between mode shapes, also called coupled-mode flutter. The p–k method, ... -
Large Eddy Simulation of a Condensing Wet Steam Turbine Cascade
(The American Society of Mechanical Engineers (ASME), 2021)The influence of turbulence modeling approach by means of (U)RANS and large eddy simulation (LES) on the overall modeling of turbulent condensing wet steam flows is investigated using the example of a low-pressure steam ... -
Large-Eddy Simulation of Flame Dynamics During the Ignition of a Swirling Injector Unit and Comparison With Experiments
(The American Society of Mechanical Engineers (ASME), 2021)During the ignition of a swirled single-injector combustor, two phases have been identified experimentally. In the first, the flame penetrates the injection unit, while in the second, the flame lifts off after a substantial ... -
Scavenge Performance of an Optimized Shallow Sump at Various Flow Conditions
(The American Society of Mechanical Engineers (ASME), 2021)Oil scavenge flow in aero-engine bearing chamber remains largely a challenging problem for many engine designers. Research campaign on scavenge flow has been conducted by G2TRC—Gas Turbine and Transmissions Research Centre ... -
A New Approach to Modeling Slip and Work Input for Centrifugal Compressors
(The American Society of Mechanical Engineers (ASME), 2021)A new method of modeling slip factor and work input for centrifugal compressor impellers is presented. Rather than using geometry to predict the behavior of the flow at the impeller exit, the new method leverages governing ... -
On a New Nonlinear Reduced-Order Model for Capturing Internal Resonances in Intentionally Mistuned Cyclic Structures
(The American Society of Mechanical Engineers (ASME), 2021)Cyclic structures such as turbomachinery present material and geometrical variations between sectors. These discrepancies are called mistuning and break the cyclic symmetry of the structure. Computing the forced response ... -
Dynamic Model-Based Identification of Cavitation Compliance and Mass Flow Gain Factor in Rocket Engine Turbopump Inducers
(The American Society of Mechanical Engineers (ASME), 2021)Cavitation dynamics continue to pose a significant risk in the development and operation of launch vehicle (LV) propulsion systems. In addition to generating unsteady loads that can directly damage turbopump hardware, ... -
The Impact of Exceptional Points on the Reliability of Thermoacoustic Stability Analysis
(The American Society of Mechanical Engineers (ASME), 2021)Exceptional points can be found for specific sets of parameters in thermoacoustic systems. At an exceptional point, two eigenvalues and their corresponding eigenfunctions coalesce. Given that the sensitivity of these ...