Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1661-1680 of 9564
-
An Experimental Research on the Effects of Negative Valve Overlap on Performance and Operating Range in a Homogeneous Charge Compression Ignition Engine With RON40 and RON60 Fuels
(The American Society of Mechanical Engineers (ASME), 2020)In this study, the effects of negative valve overlap (NVO) on homogenous charge compression ignition (HCCI) combustion and engine performance were experimentally investigated. A four stroke, single cylinder, port injection ... -
Validation of a Turbine Blade Component Test With Frictional Contacts by Phase-Locked-Loop and Force-Controlled Measurements
(The American Society of Mechanical Engineers (ASME), 2020)In this paper, a validation approach for a turbine blade component test with frictional contacts is presented. The investigated system is derived from a high cycle fatigue test setup, where a turbine blade is base-excited ... -
Strain Gage Ramifications on Mistuning in As-Manufactured Models and Experimental Testing
(The American Society of Mechanical Engineers (ASME), 2020)Blade-mounted strain gages are vital during rig and engine development to ensure safe engine operation. However, they also enable a change in dynamics of integrally bladed rotors (IBRs). State-of-the-art IBR dynamic response ... -
Impact of Different Volume Sizes on Dynamic Stability of a Gas Turbine-Fuel Cell Hybrid System
(The American Society of Mechanical Engineers (ASME), 2020)A dynamic model is developed for a microgas turbine (MGT), characterized by an intrinsic free-spool configuration, coupled to large volumes. This is inspired by an experimental facility at the National Energy Technology ... -
Assessment of Thermo-Electric Power Plants for Rotorcraft Application
(The American Society of Mechanical Engineers (ASME), 2020)This paper assesses a parallel electric hybrid propulsion system utilizing simple and recuperated cycle gas turbine configurations. An adapted engine model capable to reproduce a turboshaft engine steady state and transient ... -
Measured and Simulated Forced Response of a Rotating Turbine Disk With Asymmetric and Cylindrical Underplatform Dampers
(The American Society of Mechanical Engineers (ASME), 2020)The dynamics of turbine blades with underplatform dampers (UPDs) is often experimentally explored by using small test rigs like two-blade models for cost and complexity reasons. In this paper, the dynamics of a large-scale ... -
Estimation of Forcing Function, Mistuning, and Modal Damping in a Bladed Rotor
(The American Society of Mechanical Engineers (ASME), 2020)This paper deals with the estimation of forcing function, modal damping, and mistuned modal stiffnesses in a bladed rotor. Previous research on parameter estimation in a mistuned bladed rotor relies on the knowledge of the ... -
Design of Curved Annular Diffusers
(The American Society of Mechanical Engineers (ASME), 2020)Influence of curvature distribution and area-ratio (AR) distribution on the pressure fields within the curved annular diffuser are discussed. General guidelines for end-wall contouring to control the pressure gradients on ... -
An Investigation of the End-Notched Flexure and End-Loaded Split Tests Applied to the Mode II Interlaminar Fracture of a SiC/SiC Ceramic Matrix Composite
(The American Society of Mechanical Engineers (ASME), 2020)Delamination is a common failure mode observed in ceramic matrix composites (CMCs) and occurs as a result of applied interlaminar tensile and shear stresses exceeding the interlaminar strength. As CMCs are further implemented ... -
Surge and Stall Detection Using Acoustic Analysis for Gas Turbine Hybrid Cycles
(The American Society of Mechanical Engineers (ASME), 2020)Compressor dynamics were studied in a gas turbine—fuel cell hybrid power system having a larger compressor volume than traditionally found in gas turbine systems. This larger compressor volume adversely affects the surge ... -
Nonlinear Vibration Prediction of a Highly Flexible Rotor Supported by an Axial Groove Journal Bearing Considering Journal Angular Whirling Motion
(The American Society of Mechanical Engineers (ASME), 2020)The difference in dynamic behavior of the rotor-bearing system supported by the bearing model that considers both lateral and angular whirling motions of the journal (model A), and the model that considers only lateral ... -
Design and Experimental Assessment of Bladeless Turbines for Axial Inlet Supersonic Flows
(The American Society of Mechanical Engineers (ASME), 2020)Supersonic inlet flow is usually considered to be detrimental to the performance of turbine systems. A new class of bladeless turbines was developed, which allows for power extraction from supersonic axial inflows without ... -
Theoretical and Experimental Investigation of a Small-Scale, High-Speed, and Oil-Free Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems
(The American Society of Mechanical Engineers (ASME), 2020)The Laboratory for Applied Mechanical Design (LAMD) designed, manufactured, and experimentally tested a novel recirculation fan for a 10 kWe solid oxide fuel cell (SOFC). The fan uses oil-free bearings, more specifically ... -
Evaluation of Critical Crack Orientations and Crack Growth Analysis in Compressor Blade Root Subjected to Fatigue
(The American Society of Mechanical Engineers (ASME), 2020)Aero-engine compressor blade and disk assemblies are subjected to radially outward centrifugal force due to blade rotation and the bending of the blade due to gas pressure. Static analysis is done initially to find the ... -
The Effect of Rated Climb Performance on Low Cycle Fatigue of a Civil Turbojet Engine
(The American Society of Mechanical Engineers (ASME), 2020)Low cycle fatigue (LCF) of jet engine disks is a major contributor to the maintenance costs of an engine. The current industry standard for the analysis of LCF is to use representative flight missions to reflect the ... -
Simulation, Test, and Mitigation of ½× Forward Whirl Following Rotor Drop Onto Auxiliary Bearings
(The American Society of Mechanical Engineers (ASME), 2020)1/2× forward whirl repeatedly occurred after a test rotor spinning at 5800 rpm was dropped onto ball bearing type auxiliary bearings (AB), utilized as a backup for magnetic bearings (MB). The measured contact forces that ... -
Experimental Study of Flow Inside a Centrifugal Fan Using Magnetic Resonance Velocimetry
(The American Society of Mechanical Engineers (ASME), 2020)Three-dimensional (3D), three-component time-averaged velocity fields have been measured within a low-speed centrifugal fan with forward curved (FC) blades. The model investigated is representative of fans commonly used ... -
Impact of Forecast Uncertainty on Wind Farm Profitability
(The American Society of Mechanical Engineers (ASME), 2020)The great amount of support schemes that initially fueled the fast and often uncontrollable, renewable energy sources (RESs) growth have been strongly reduced or revoked in many countries. Currently, the general trend is ... -
Characterization of Additive Layer Manufacturing Swirl Burner Surface Roughness and Its Effects on Flame Stability Using High-Speed Diagnostics
(The American Society of Mechanical Engineers (ASME), 2020)In this study, two Inconel 625 swirl nozzle inserts with identical bulk geometry were constructed via additive layer manufacturing (ALM) for use in a generic gas turbine swirl burner. Further postprocessing by grit blasting ... -
Modeling Geared Turbofan and Open Rotor Engine Performance for Year-2050 Long-Range and Short-Range Aircraft
(The American Society of Mechanical Engineers (ASME), 2020)This paper provides design and performance data for two envisaged year-2050 engines: a geared high bypass turbofan for intercontinental missions and a contra-rotating pusher open rotor targeting short to medium range ...