Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1941-1960 of 9564
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Effects of a Diverging Cup on Swirl Number, Flow Pattern, and Topology of Premixed Flames
(The American Society of Mechanical Engineers (ASME), 2019)Impact of the diverging cup angle of a swirling injector on the flow pattern and stabilization of technically premixed flames is investigated both theoretically and experimentally with the help of OH* chemiluminescence, ... -
Investigation on the Stall Inception Circumferential Position and Stall Process Behavior in a Centrifugal Compressor With Volute
(The American Society of Mechanical Engineers (ASME), 2019)The present paper numerically and experimentally investigates the stall inception mechanisms in a centrifugal compressor with volute. Current studies about stall inception pay more attention on the axial compressors than ... -
Transient Performance of Separated Flows: Characterization and Active Flow Control
(The American Society of Mechanical Engineers (ASME), 2019)The aerothermal performance of the low-pressure turbine in unmanned aerial vehicles is significantly abated at high altitude, due to boundary layer separation. Different flow control strategies have been proposed to prevent ... -
Volumetric Velocimetry Measurements of Film Cooling Jets
(The American Society of Mechanical Engineers (ASME), 2019)This paper presents volumetric velocimetry (VV) measurements for a jet in crossflow that is representative of film cooling. VV employs particle tracking to nonintrusively extract all three components of velocity in a ... -
Experimental Analysis of a NACA 0021 Airfoil Under Dynamic Angle of Attack Variation and Low Reynolds Numbers
(The American Society of Mechanical Engineers (ASME), 2019)The wind industry needs reliable and accurate airfoil polars to properly predict wind turbine performance, especially during the initial design phase. Medium- and low-fidelity simulations directly depend on the accuracy ... -
Background-Oriented Schlieren of Fuel Jet Flapping Under Thermoacoustic Oscillations in a Sequential Combustor
(The American Society of Mechanical Engineers (ASME), 2019)This study deals with thermoacoustic instabilities in a generic sequential combustor. The thermoacoustic feedback involves two flames: the perfectly premixed swirled flame anchored in the first stage and the sequential ... -
Characterization of an Aircraft Auxiliary Power Unit Test Rig for Cycle Optimization Studies
(The American Society of Mechanical Engineers (ASME), 2019)Detailed information of the thermodynamic parameters, system performance, and operating behavior of aircraft auxiliary power units (APU) cycles is rarely available in literature. In order to set up numeric models and study ... -
Experimental and Computational Investigation of Flow Instabilities in Turbine Rim Seals
(The American Society of Mechanical Engineers (ASME), 2019)In high-pressure turbines, cool air is purged through rim seals at the periphery of wheel-spaces between the stator and rotor disks. The purge suppresses the ingress of hot gas from the annulus but superfluous use is ... -
Measurements of the reactivity of premixed, stagnation, methane-air flames at gas turbine relevant pressures
(The American Society of Mechanical Engineers (ASME), 2019)The adiabatic, unstrained, laminar flame speed, SL, is a fundamental combustion property, and a premier target for the development and validation of thermochemical mechanisms. It is one of the leading parameters determining ... -
Application of the Modal Approach for Prediction of Forced Response Amplitudes for Fan Blades
(The American Society of Mechanical Engineers (ASME), 2019)Forced response is the main reason for high cycle fatigue in turbomachinery. Not all resonance points in the operating range can be avoided especially for low order excitation. For highly flexible carbon fiber reinforced ... -
T63 Turbine Response to Rotating Detonation Combustor Exhaust Flow
(The American Society of Mechanical Engineers (ASME), 2019)This paper describes testing an axial turbine response when driven by a rotating detonation combustor (RDC). A T63 (C20-250) gas turbine is modified by replacing the combustor with a RDC. The stator vanes of the T63 are ... -
Dynamic Characterization of a Novel Externally Pressurized Compliantly Damped Gas-Lubricated Bearing With Hermetically Sealed Squeeze Film Damper Modules
(The American Society of Mechanical Engineers (ASME), 2019)Ever-increasing demand for cleaner energy is driving the need for higher power density turbomachinery while reducing cost and simplifying design. Gas-lubricated bearings are representing one of the enabling technologies ... -
A Feasibility Study of Controllable Gas Foil Bearings With Piezoelectric Materials Via Rotordynamic Model Predictions
(The American Society of Mechanical Engineers (ASME), 2019)This study presents a new concept of controllable gas foil bearings (C-GFBs) with piezoelectric actuators. The C-GFB consists of a laminated top foil, bump foil, and piezo stacks and can simply change the bearing shape or ... -
Implementation of Detailed Chemistry Mechanisms in Engine Simulations
(The American Society of Mechanical Engineers (ASME), 2019)The stiffness of large chemistry mechanisms has been proved to be a major hurdle toward predictive engine simulations. As a result, detailed chemistry mechanisms with a few thousand species need to be reduced based on ... -
Compliant Hybrid Gas Bearing Using Modular Hermetically Sealed Squeeze Film Dampers
(The American Society of Mechanical Engineers (ASME), 2019)This paper presents a new gas bearing concept that targets machine applications in the megawatt (MW) power range. The concept involves combining a compliant hybrid gas bearing (CHGB) with two hermetically sealed squeeze ... -
Hermetically Sealed Squeeze Film Damper for Operation in Oil-Free Environments
(The American Society of Mechanical Engineers (ASME), 2019)The following work advances a new concept for a hermetically sealed squeeze film damper (HSFD), which does not require an open-flow lubrication system. The hermetically sealed concept utilizes a submersed plunger within a ... -
Study on the Intake Valve Close Timing Misalignment Between the Maximum Volume Efficiency and the None Backflow on a Single Cylinder Diesel Engine
(The American Society of Mechanical Engineers (ASME), 2019)Since the intake valve close timing (IVC) directly determines the amount of displacement backflow and the amount of fresh charge trapped in the cylinder, optimizing the IVC is important to improve the performance of the ... -
Numerical Simulation of the Blade Aging Process in an Induced Draft Fan Due to Long Time Exposition to Fly Ash Particles
(The American Society of Mechanical Engineers (ASME), 2019)Erosion issues usually affect fans used for the extraction of exhaust gas in power plants. Because of the presence of fly ash within the exhaust flow, fan blades are subjected to material wear at the leading edge, trailing ... -
On the Influence of Fuel Stratification and Its Control on the Efficiency of the Shockless Explosion Combustion Cycle
(The American Society of Mechanical Engineers (ASME), 2019)Constant volume combustion (CVC) cycles for gas turbines are considered a very promising alternative to the conventional Joule cycle and its variations. The reason is the considerably higher thermal efficiency of these ... -
Effects of Effusion Cooling Pattern Near the Dilution Hole for a Double-Walled Combustor Liner—Part II: Flowfield Measurements
(The American Society of Mechanical Engineers (ASME), 2019)The complex flowfield inside a gas turbine combustor creates a difficult challenge in cooling the combustor walls. Many modern combustors are designed with a double-wall that contain both impingement cooling on the backside ...