Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1861-1880 of 9564
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Guiding Actuator Designs for Active Flow Control of the Precessing Vortex Core by Adjoint Linear Stability Analysis
(The American Society of Mechanical Engineers (ASME), 2019)The fundamental impact of the precessing vortex core (PVC) as a dominant coherent flow structure in the flow field of swirl-stabilized gas turbine combustors has still not been investigated in depth. In order to do so, the ... -
Degradation of Aerodynamic Performance of an Intermediate-Pressure Steam Turbine Due to Erosion of Nozzle Guide Vanes and Rotor Blades
(The American Society of Mechanical Engineers (ASME), 2019)Deteriorations of nozzle guide vanes (NGVs) and rotor blades of a steam turbine through a long-time operation usually decrease a thermal efficiency and a power output of the turbine. In this study, influences of blade ... -
Rotational Speed-Dependent Contact Formulation for Nonlinear Blade Dynamics Prediction
(The American Society of Mechanical Engineers (ASME), 2019)Considering rotational speed-dependent stiffness for vibrational analysis of friction-damped bladed disk models has proven to lead to significant improvements in nonlinear frequency response curve computations. The accuracy ... -
Dynamic Analysis and Reduction of a Cyclic Symmetric System Subjected to Geometric Nonlinearities
(The American Society of Mechanical Engineers (ASME), 2019)The search for ever lighter weight has become a major goal in the aeronautical industry as it has a direct impact on fuel consumption. It also implies the design of increasingly thin structures made of sophisticated and ... -
A Study on Matching Between Centrifugal Compressor Impeller and Low Solidity Diffuser and Its Extension to Vaneless Diffuser
(The American Society of Mechanical Engineers (ASME), 2019)A centrifugal compressor requires a wide operating range as well as a high efficiency. At high pressure ratios, the impeller discharge velocity becomes transonic and effective pressure recovery in a vaned or vaneless ... -
Performance Analysis of an Intermediate-Temperature-SOFC/Gas Turbine Hybrid System Using Gasified Biomass Fuel in Different Operating Modes
(The American Society of Mechanical Engineers (ASME), 2019)This work used the established mathematic models of an intermediate-temperature solid oxide fuel cell (IT-SOFC) and gas turbine (GT) hybrid system fueled with wood chip gas to investigate the load performance and safe ... -
Operation of a Spark Ignition Engine With High Compression Ratio Using Biogas Blended With Natural Gas, Propane, and Hydrogen
(The American Society of Mechanical Engineers (ASME), 2019)This research evaluated the operational conditions for a diesel engine with high compression ratio (CR) converted to spark ignition (SI), under stable combustion conditions close to the knocking threshold. The main fuel ... -
In-Cylinder Pressure-Based Low-Pressure-Cooled Exhaust Gas Recirculation Estimation Methods for Turbocharged Gasoline Direct Injection Engines
(The American Society of Mechanical Engineers (ASME), 2019)This paper proposes three different methods to estimate the low-pressure cooled exhaust gas recirculation (LP-EGR) mass flow rate based on in-cylinder pressure measurements. The proposed LP-EGR models are designed with ... -
Emulsion Jet in Crossflow Atomization Characteristics and Dynamics
(The American Society of Mechanical Engineers (ASME), 2019)This work presents the atomization characteristics and dynamics of water-in-heptane (W/H) emulsions injected into a gaseous crossflow. W/H mixtures were tested while varying momentum flux ratios and aerodynamic Weber ... -
Impact Analysis of Pocket Damper Seal Geometry Variations on Leakage Performance and Rotordynamic Force Coefficients Using Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2019)In this paper, different notch and partition wall arrangements of a fully partitioned pocket damper seal (FPDS) are investigated using computational fluid dynamics (CFD). The CFD model is derived for a baseline FPDS design ... -
Intelligent Reasoning for Gas Turbine Fault Isolation and Ambiguity Resolution
(The American Society of Mechanical Engineers (ASME), 2019)An engine health management (EHM) system typically consists of automated logic for data acquisition, parameter calculation, anomaly detection and eventually, fault identification (or isolation). Accurate fault isolation ... -
Influence of Geometric Design Parameters Onto Vibratory Response and High-Cycle Fatigue Safety for Turbine Blades With Friction Damper
(The American Society of Mechanical Engineers (ASME), 2019)Among the major concerns for high aspect-ratio, turbine blades are forced and self-excited (flutter) vibrations, which can cause failure by high-cycle fatigue (HCF). The introduction of friction damping in turbine blades, ... -
Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors
(The American Society of Mechanical Engineers (ASME), 2019)Phosphor thermometry has been developed for wall temperature measurements in gas turbines and gas turbine model combustors. An array of phosphors has been examined in detail for spatially and temporally resolved surface ... -
Flow Field and Hot Streak Migration Through a High Pressure Cooled Vanes With Representative Lean Burn Combustor Outflow
(The American Society of Mechanical Engineers (ASME), 2019)Modern lean burn aero-engine combustors make use of relevant swirl degrees for flame stabilization. Moreover, important temperature distortions are generated, in tangential and radial directions, due to discrete fuel ... -
Surrogate Fuels Formulation for FACE Gasoline Using the Nuclear Magnetic Resonance Spectroscopy
(The American Society of Mechanical Engineers (ASME), 2019)An efficient surrogate fuel formulation methodology, which directly uses the chemical structure information from nuclear magnetic resonance (NMR) spectroscopy analysis, has been proposed. Five functional groups, paraffinic ... -
A Detailed Techno-Economic Analysis of Gas Turbines Applied to Concentrated Solar Power Plants With Central Receiver
(The American Society of Mechanical Engineers (ASME), 2019)This work presents a very detailed techno-economic analysis of the technology, made up of two complementary models. A performance model implemented in Thermoflex environment is used to explore alternative integration layouts ... -
Blowoff and Reattachment Dynamics of a Linear Multinozzle Combustor
(The American Society of Mechanical Engineers (ASME), 2019)This paper describes the coupled flow and flame dynamics during blowoff and reattachment events in a combustor consisting of a linear array of five interacting nozzles using 10 kHz repetition-rate OH planar laser-induced ... -
On the Influence of the Entrance Section on the Rotordynamic Performance of a Pump Seal With Uniform Clearance: A Sharp Edge Versus A Round Inlet
(The American Society of Mechanical Engineers (ASME), 2019)Secondary flows through annular seals in pumps must be minimized to improve their mechanical efficiency. Annular seals, in particular balance piston seals, also produce rotordynamic force coefficients, which easily control ... -
A New Spin on Small-Scale Combustor Geometry
(The American Society of Mechanical Engineers (ASME), 2019)The ultra-compact combustor (UCC) is an innovative combustor system alternative to traditional turbine engine combustors with the potential for engine efficiency improvements with a reduced volume. Historically, the UCC ... -
Start-Up Optimization of a CCGT Power Station Using Model-Based Gas Turbine Control
(The American Society of Mechanical Engineers (ASME), 2019)The rapid growth of renewable generation and its intermittent nature has modified the role of combined cycle power stations in the energy industry, and the key feature for the operational excellence is now flexibility. ...