Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 3641-3660 of 9564
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Leakage and Rotordynamic Coefficients of Brush Seals With Zero Cold Clearance Used in an Arrangement With Labyrinth Fins
(The American Society of Mechanical Engineers (ASME), 2013)A brushlabyrinth sealing configuration consisting of two labyrinth fins upstream and one brush seal downstream is studied experimentally and theoretically. Two slightly different brush seal designs with zero cold radial ... -
Performance Entitlement of Supercritical Steam Bottoming Cycle
(The American Society of Mechanical Engineers (ASME), 2013)A supercritical steam bottoming cycle has been proposed as a performance enhancement option for gas turbine combined cycle power plants. The technology has been widely used in coalfired steam turbine power plants since the ... -
Measurements of Rotordynamic Response and Temperatures in a Rotor Supported on Metal Mesh Foil Bearings
(The American Society of Mechanical Engineers (ASME), 2013)Gas bearings in power generation microturbomachinery (MTM) and for automotive turbocharger applications must demonstrate adequate thermal management without performance degradation while operating in a harsh environment. ... -
Closure to “Discussion on â€کDamping and Inertia Coefficients for Two End Sealed Squeeze Film Dampers With a Central Groove: Measurements and Predictions,’†(2013, ASME Paper No. GT2013 94273).
(The American Society of Mechanical Engineers (ASME), 2013)As per the question, “how can the magnitude of the groove effective depth be objectively selected knowing that the flow field is so complex?†the authors concur with Dr. Arghir's judgment, that is, one cannot ascertain ... -
Discussion: “Damping and Inertia Coefficients for Two End Sealed Squeeze Film Dampers With a Central Groove: Measurements and Predictions†(authored by San Andrأ©s, L., and Seshagiri, S.)
(The American Society of Mechanical Engineers (ASME), 2013)The model used by the authors for comparisons with measurement is based on the Reynolds equation in the thin film and on a simplified equation of the flow inside the feeding groove. The model of the feeding groove flow ... -
Modeling and Analysis of Micro Hybrid Gas Spiral Grooved Thrust Bearing for Microengine
(The American Society of Mechanical Engineers (ASME), 2013)The micro hybrid spiralgrooved thrust bearing is a promising candidate to support the rotating elements in power MEMS devices such as micro gas turbine engines. However, the realization of hybrid thrust bearings has ... -
Characterization of Lean Burn Module Air Blast Pilot Injector With Laser Techniques
(The American Society of Mechanical Engineers (ASME), 2013)For lean burn combustor development in low emission aeroengines, the pilot stage of the fuel injector plays a key role with respect to stability, operability, NOx emissions, and smoke production. Therefore it is of ... -
A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy Based Fatigue Life Prediction Method
(The American Society of Mechanical Engineers (ASME), 2013)The energybased lifing method is based on the theory that the cumulative energy in all hysteresis loops of a specimens' lifetime is equal to the energy in a monotonic tension test. Based on this theory, fatigue life can ... -
An Investigation on Dynamic Characteristics of a Gas Turbine Rotor Using an Improved Transfer Matrix Method
(The American Society of Mechanical Engineers (ASME), 2013)This paper presents an investigation on dynamic characteristics of a rodfastened rotor. Based on the framework of a traditional Riccati transfer matrix method (TMM), an improved Riccati TMM considering contact effects ... -
Quantitative Stability Analysis Using Real Valued Frequency Response Data
(The American Society of Mechanical Engineers (ASME), 2013)Models for the analysis of thermoacoustic instabilities are conveniently formulated in the frequency domain. In this case one often faces the difficulty that the response behavior of some elements of the system is only ... -
Modeling and Validation of the Nonlinear Dynamic Behavior of Bolted Flange Joints
(The American Society of Mechanical Engineers (ASME), 2013)Linear dynamic finite element analysis can be considered very reliable today for the design of aircraft engine components. Unfortunately, when these individual components are built into assemblies, the level of confidence ... -
Fault Tolerant Control of an Industrial Gas Turbine Based on a Hybrid Fuzzy Adaptive Unscented Kalman Filter
(The American Society of Mechanical Engineers (ASME), 2013)Gas turbines are generally used in power generation, the oil and gas industries, and as jet engines in aircrafts. Fault tolerance and reliability is important in such applications. Thus, accurate modeling and control system ... -
Performance Characteristics of Metal Mesh Foil Bearings: Predictions Versus Measurements
(The American Society of Mechanical Engineers (ASME), 2013)Proven lowcost gas bearing technologies are sought to enable more compact rotating machinery products with extended maintenance intervals. The paper presents an analysis for predicting the static and dynamic forced performance ... -
An Experimental Validation of Heat Release Rate Fluctuation Measurements in Technically Premixed Flames
(The American Society of Mechanical Engineers (ASME), 2013)Understanding the effects of inlet velocity and inlet equivalence ratio fluctuations on heat release rate fluctuations in lean premixed gas turbine combustors is essential for predicting combustor instability characteristics. ... -
Why Nonuniform Density Suppresses the Precessing Vortex Core
(The American Society of Mechanical Engineers (ASME), 2013)Linear stability analysis is applied to a swirlstabilized combustor flow with the aim to understand how the flame shape and associated density field affects the manifestation of selfexcited flow instabilities. In isothermal ... -
Study of Fuel Composition, Burner Material, and Tip Temperature Effects on Flashback of Enclosed Jet Flame
(The American Society of Mechanical Engineers (ASME), 2013)Flashback is a key challenge for low NOx premixed combustion of high hydrogen content fuels. Previous work on jet burner configurations has systematically investigated the impact of fuel composition on flashback propensity, ... -
Effect of Reynolds Number on Deposition in Fuels Flowing Over Heated Surfaces
(The American Society of Mechanical Engineers (ASME), 2013)An increasing demand is being put on the fuel as a heat sink in modern aircraft. In the end, the fuel flows through the atomizer, which is both the hottest part in the thermal history of the fuel and the most critical for ... -
Design for Thermo Acoustic Stability: Procedure and Database
(The American Society of Mechanical Engineers (ASME), 2013)A design for thermoacoustic stability (DeTAS) procedure is presented, that aims at selecting a most stable burner geometry for a given combustor. It is based on the premise that a thermoacoustic stability model of the ... -
Flame Patterns and Combustion Intensity Behind Rifled Bluff Body Frustums
(The American Society of Mechanical Engineers (ASME), 2013)Rifled fillisters were milled on cannular frustums to modulate flow behavior and to increase the turbulence intensity (TI). The TI and combustion intensity were compared in four configurations of frustums—unrifled, ... -
Numerical Investigation of Combustion Instability in a V Gutter Stabilized Combustor
(The American Society of Mechanical Engineers (ASME), 2013)The stability of the combustion process in a Vgutter stabilized combustor is numerically investigated. To this end, 3D compressible turbulent and unsteady reacting flow calculations have been carried out using LES. The ...