Journal of Turbomachinery: Recent submissions
Now showing items 681-700 of 4519
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Investigation of the Flow Field and the Pressure Recovery in a Gas Turbine Exhaust Diffuser at Design, Part-Load, and Over-Load Conditions
(The American Society of Mechanical Engineers (ASME), 2022)The performance of axial diffusers installed downstream of heavy duty gas turbines is mainly affected by the turbine load. Thereby the outflow varies in Mach number, total pressure distribution, swirl and its tip leakage ... -
Analysis of Measured and Predicted Turbine Maps From Start-Up to Design Point
(The American Society of Mechanical Engineers (ASME), 2022)This paper describes a coupled experimental and computational fluid dynamics (CFD) campaign conducted on a 1.5 intermediate turbine stage in the full range of operating conditions, from start-up to design point under ... -
Experimental Determination of Heat Transfer Coefficient on Impingement Cooled Gear Flanks: Validation of the Evaluation Method
(The American Society of Mechanical Engineers (ASME), 2022)Understanding the heat transfer characteristics of impingement cooling of high-speed high-power gears is essential to design a reliable gearbox for a new generation of jet engines. However, experimental data on the impingement ... -
Effect of Differential Tip Clearance on the Performance of a Tandem Rotor
(The American Society of Mechanical Engineers (ASME), 2022)Tandem blade is an interesting concept that promises a higher total pressure rise per stage. Owing to two separate tip leakage vortices and their interaction, losses are likely to increase particularly near the tip region. ... -
Effects of Rotation on the Flow Structure in a Compressor Cascade
(The American Society of Mechanical Engineers (ASME), 2022)In turbomachines, rotors and stators differ by the rotation of the former. Hence, half of each stage is directly influenced by rotation effects. The influence of rotation on the flow structure and its impact on the performance ... -
In-Stall Compressor Performance and the Effects of Reynolds Number
(The American Society of Mechanical Engineers (ASME), 2022)Previous research into axial compressor stall has mainly focused on stall inception and methods to extend the stable operating range. This paper considers the performance of an axial compressor beyond stall and investigates ... -
Bayesian Mass Averaging in Rigs and Engines
(The American Society of Mechanical Engineers (ASME), 2022)This paper introduces the Bayesian mass average and details its computation. Owing to the complexity of flow in an engine and the limited instrumentation and the precision of the sensor apparatus used, it is difficult to ... -
Machine Learning for the Development of Data-Driven Turbulence Closures in Coolant Systems
(The American Society of Mechanical Engineers (ASME), 2022)This work shows the application of Gene Expression Programming to augment RANS turbulence closures for flows though complex geometries. Specifically, an optimized internal cooling channel of a turbine blade, designed for ... -
Calibration of a Computational Fluid Dynamics Methodology for the Simulation of Roughness Effects on Friction and Heat Transfer in Additive Manufactured Components
(The American Society of Mechanical Engineers (ASME), 2022)It is well known from the literature that surface roughness significantly affects friction and heat transfer. This is even more evident for additive manufactured (AM) components, which are taking an increasingly important ... -
Analysis of Swirl Number Effects on Effusion Flow Behavior Using Time-Resolved Particle Image Velocimetry
(The American Society of Mechanical Engineers (ASME), 2022)The analysis of the interaction between the swirling and cooling flows, promoted by the liner film cooling system, is a fundamental task for the design of turbine combustion chambers since it influences different aspects ... -
Exploring Topology Optimization for High Pressure Turbine Blade Tips
(The American Society of Mechanical Engineers (ASME), 2022)This work presents the aerodynamic topology optimization of high-pressure turbine rotor blade tips. Before carrying out the topology optimization on the blade tip, some initial tip design studies were carried out. A winglet ... -
One-Dimensional Modeling for Pulsed Flow Twin-Entry Turbine
(The American Society of Mechanical Engineers (ASME), 2022)One-dimensional (1D) modeling is critical for turbomachinery unsteady performance prediction and system response assessment of internal combustion engines. This paper uses a novel 1D modeling (TURBODYNA) and proposes two ... -
A Contra-Rotating Open Rotor Noise Reduction Methodology by Using Anhedral Blade Tip
(The American Society of Mechanical Engineers (ASME), 2022)In this article, a novel contra-rotating open rotor (CROR) noise reduction methodology based on the anhedral blade tip applied to the front blade is developed. Results indicate that anhedral blade tip can provide noise ... -
Effective Clearance and Differential Gapping Impact on Seal Flutter Modeling and Validation
(The American Society of Mechanical Engineers (ASME), 2022)This paper presents an update of the model derived by Corral and Vega (2018, “Conceptual Flutter Analysis of Labyrinth Seal Using Analytical Models. Part I—Theoretical Support,” ASME J. Turbomach., 140(12), p. 121006) for ... -
A Simplified Method for the Deposition Rate Assessment on the Vanes of a Multistage Axial-Flow Compressor
(The American Society of Mechanical Engineers (ASME), 2022)Gas turbine particle ingestion may lead to the deposition of contaminants in the compressor section, inducing the performance losses of the whole engine. The economic losses derived from this issue push great interest in ... -
Film Cooling Effectiveness Measurement of Fan-Shaped Holes Manufactured Using Electrical Discharge Machining Technique
(The American Society of Mechanical Engineers (ASME), 2022)In this study, the influence of geometric factors such as hole diameter (D), length-to-diameter ratio (L/D), injection angle (α), and lateral expansion angle (β) on film cooling effectiveness of holes made using electrical ... -
Experimental and Numerical Study of the Turbulent Flow and Heat Transfer in a Wedge-Shaped Channel With Guiding Pin Fin Arrays Under Rotating Conditions
(The American Society of Mechanical Engineers (ASME), 2022)Experiments and numerical simulations under stationary and rotating conditions have been conducted to investigate turbulent flow and heat transfer characteristics of innovative guiding pin fin arrays in a wedge-shaped ... -
Experimental and Numerical Study of Heat Transfer and Pressure Loss in a Swirl Multi-Pass Channel With Convergent Jet Slots
(The American Society of Mechanical Engineers (ASME), 2022)This paper presents a comparative experimental and numerical study of the heat transfer and pressure loss in a swirl multi-pass channel with tangential jet slots, and another baseline multi-pass channel with 180-deg U-bends ... -
Flow Check and Adiabatic Effectiveness Measurements on Traditionally Versus Additively Manufactured Film-Cooling Holes
(The American Society of Mechanical Engineers (ASME), 2022)In the recent years Additive Manufacturing (AM) methods, such as the Direct Metal Laser Melting (DMLM) technology, are getting more and more attractive and feasible for the realization of components and subcomponents of ... -
Cooling Performance of Additively Manufactured Pin Fins in Stacked Microchannels for the Inside-Out Ceramic Turbine Shroud-Cooling Ring
(The American Society of Mechanical Engineers (ASME), 2022)The inside-out ceramic turbine (ICT), a novel microturbine rotor architecture, has an air-cooled ring, which keeps its composite rotating structural shroud within operating temperature. The cooling ring must achieve a ...