Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1101-1120 of 9564
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Effects of Nonaxisymmetric Volute on Rotating Stall in the Vaneless Diffuser of Centrifugal Compressors
(The American Society of Mechanical Engineers (ASME), 2022)Rotating stall is an important unstable flow phenomenon that leads to performance degradation and limits the stability boundary in centrifugal compressors. The volute is one of the sources inducing nonaxisymmetric flows ... -
Bayesian Calibration of Performance Degradation in a Gas Turbine-Driven Compressor Unit for Prognosis Health Management
(The American Society of Mechanical Engineers (ASME), 2022)Prognosis health management is an effective way to improve the operational safety and economy of industrial equipment. The development of an accurate and quick response model to monitor equipment health status, predict ... -
Multiparameter Optimization to Improve the Erosion Resistance of Coating by Finite Element Simulation
(The American Society of Mechanical Engineers (ASME), 2022)Finite element method (FEM) was used to study the stress peak of stress S11 (radial stress component in X-axis) on the steam turbine blade surface of four typical erosion-resistant coatings (Fe2B, CrN, Cr3C2–NiCr and ... -
Determining the Influence of Casing Vibrational Behavior on Rotordynamics
(The American Society of Mechanical Engineers (ASME), 2022)Casings of machinery and support structures have an influence on the rotordynamic behavior, which is commonly considered by simplified models (e.g., one degree-of-freedom models). These are in many cases insufficient. ... -
Modal Decomposition Analysis of Combustion Instability Due to External Perturbation in a Mesoscale Burner Array
(The American Society of Mechanical Engineers (ASME), 2022)In this work, the growth regime of combustion instability was studied by analyzing 10 kHz OH planar laser-induced fluorescence (PLIF) images through a combination of dynamic mode decomposition (DMD) and spectral proper ... -
Flow and Heat Transfer Mechanisms in a Rotating Compressor Cavity Under Centrifugal Buoyancy-Driven Convection
(The American Society of Mechanical Engineers (ASME), 2022)This paper presents a systematic study of flow and heat transfer mechanisms in a compressor disk cavity with an axial throughflow under centrifugal buoyancy-driven convection, comparing with previously published experimental ... -
Practical Method for Burner Staging Turbine Forced Response Evaluation
(The American Society of Mechanical Engineers (ASME), 2022)Decarbonization and sustainability efforts challenge gas turbine engineers to come up with creative strategies for reduction of emissions and efficiency increase over the whole operating range. Burner staging at part loads ... -
Low-Frequency Acoustic Response of Gas Turbine Perforated Plate and Axial Swirler
(The American Society of Mechanical Engineers (ASME), 2022)The ability of acoustic network models to model combustion instabilities is dependent on the accuracy of acoustic two-port models. While several forms of two-ports are available, the most common for these types of analyses ... -
Effects of Intrinsic Flame Instabilities on Thermoacoustic Oscillations in Lean Premixed Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2022)Thermoacoustic instabilities are commonly encountered in the development of aeroengines and rocket motors. Research on the fundamental mechanism of thermoacoustic instabilities is beneficial for the optimal design of these ... -
Data-Driven Approach for Identifying Mistuning in As-Manufactured Blisks
(The American Society of Mechanical Engineers (ASME), 2022)Sector-to-sector geometry or material property variations in as-manufactured bladed disks, or blisks, can result in significantly greater vibration responses during operation compared to nominally cyclic symmetric designs. ... -
Measurement of Heat Transfer and Flow Structures in a Closed Rotating Cavity
(The American Society of Mechanical Engineers (ASME), 2022)Buoyancy-induced flow occurs inside the rotating compressor cavities of gas turbines. These cavities are usually open at the inner radius, but in some industrial gas turbines, they are effectively closed. This paper presents ... -
The Band Gap Formation in Rotors With Longitudinal Periodicity and Quasi-Periodicity
(The American Society of Mechanical Engineers (ASME), 2022)Modal spacing (band gaps) in the frequency spectrum of rotating machines can be imposed by geometric periodicity. By designing the rotor with a geometry that repeats periodically, we can impose to the vibration response ... -
Phenomenological Analysis of the Combustion of Gaseous Fuels to Measure the Fuel's Energy Quality and Availability to Produce Work in Spark Ignition Engines, Part 2
(The American Society of Mechanical Engineers (ASME), 2022)A novel methodology is proposed to evaluate fuel’s performance in spark ignition (SI) engines based on the fuel’s energy quality and availability to produce work. Experiments used a diesel engine with a high compression ... -
Heat Transfer and Residence Time in Lean Direct Injection Fuel Galleries
(The American Society of Mechanical Engineers (ASME), 2022)In radially staged lean direct injection (LDI) systems, pilot fuel plays an important role in cooling the mains fuel gallery in regions of the flight envelope where the mains fuel is stagnant. Under these conditions, ... -
Erratum: “Start-Up Optimization of a CCGT Power Station Using Model-Based Gas Turbine Control” [ASME J. Eng. Gas Turbines Power, 2019, 141(4), p. 041018
(The American Society of Mechanical Engineers (ASME), 2022)The following two equations contain corrections, respectively, for Eqs. (16) and (17): (16)σr,j−αE(1−v)(12Tave−12 ∑j=0jTjVj∑j=0jVj)=0(17)σc,j−αE(1−v)(12Tave+12 ∑j=0jTjVj∑j=0jVj−Tj)=0 -
Stall Warning Strategy Based on Fast Wavelet Analysis in a Multistage Axial Flow Compressor
(The American Society of Mechanical Engineers (ASME), 2022)As a reliable stall warning strategy, the fast wavelet method was introduced to successfully predict the aerodynamic instability of a multistage axial flow compressor. One single sensor installed at each stage is proved ... -
Nonlinear Vibration Analysis of Turbine Bladed Disks With Midspan Dampers
(The American Society of Mechanical Engineers (ASME), 2022)Friction dampers are one of the most common secondary structures utilized to alleviate excessive vibration amplitudes in turbomachinery applications. In this paper, the dynamic behavior of the turbine bladed disks coupled ... -
Fouling Mitigation for Laser Igniters in Natural Gas Engines
(The American Society of Mechanical Engineers (ASME), 2022)Due to several recent developments in lasers and optics, laser igniters can now be designed to be (i) compact so as to have the same footprint as a standard spark plug, (ii) have low power draw, usually less than 50 Watts, ... -
Comparison of Blind Diagnostic Indicators for Condition Monitoring of Wind Turbine Gearbox Bearings
(The American Society of Mechanical Engineers (ASME), 2022)Under the pressure of climate change, renewable energy gradually replaces fossil fuels and plays nowadays a significant role in energy production. Among different types of energy sources, wind power covered 14% of the EU's ... -
Novel Cyclo-Nonstationary Indicators for Monitoring of Rotating Machinery Operating Under Speed and Load Varying Conditions
(The American Society of Mechanical Engineers (ASME), 2022)Condition monitoring arises as a valuable industrial process in order to assess the health of rotating machinery, providing early and accurate warning of potential failures and allowing for the planning and effective ...