Journal of Turbomachinery: Recent submissions
Now showing items 821-840 of 4519
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Unsteady Analysis of Heat Transfer Coefficient Distribution in a Static Ribbed Channel for An Established Flow
(The American Society of Mechanical Engineers (ASME), 2021)Turbulent-ribbed channels are extensively used in turbomachinery to enhance convective heat transfer in internally cooled components such as turbine blades. One of the key aspects of such a problem is the distribution of ... -
Aerodynamic Loading Considerations of Three-Shaft Engine Compression System During Surge
(The American Society of Mechanical Engineers (ASME), 2021)Compressor surge imposes a limit on aero-engine operability and can compromise integrity because of significant aerodynamic loads imparted on the engine components. The aim of this article is to use 3D unsteady computational ... -
Integration of Machine Learning and Computational Fluid Dynamics to Develop Turbulence Models for Improved Low-Pressure Turbine Wake Mixing Prediction
(The American Society of Mechanical Engineers (ASME), 2021)This paper presents the development of accurate turbulence closures for low-pressure turbine (LPT) wake mixing prediction by integrating a machine-learning approach based on gene expression programming (GEP), with ... -
An Experimentally Validated Low-Order Model of the Thermal Response of Double-Wall Effusion Cooling Systems for High-Pressure Turbine Blades
(The American Society of Mechanical Engineers (ASME), 2021)Transpiration cooling represents the pinnacle of turbine cooling and is characterized by an intrinsic material porosity which achieves high internal convective cooling, and full coverage cooling films on the external surface ... -
Analysis Method of Nonsynchronous Vibration and Influence of Tip Clearance Flow Instabilities on Nonsynchronous Vibration in an Axial Transonic Compressor Rotor
(The American Society of Mechanical Engineers (ASME), 2021)The relationship between the tip clearance flow (TCF) and the blade vibration in the lock-in region was numerically investigated on a transonic rotor. Both the bending (1B) and torsional (8th) modes were analyzed under 0 ... -
The Effect of Wall Thermal Boundary Condition on Natural Convective Shutdown Cooling in a Gas Turbine
(The American Society of Mechanical Engineers (ASME), 2021)As a civil gas turbine cools down, asymmetric natural convective heat transfer causes the bottom sector of the rotor to cool faster than the top; this circumferential thermal gradient can potentially cause the shaft to ... -
Aerothermal Optimization of Turbine Squealer Tip Geometries With Arbitrary Cooling Injection
(The American Society of Mechanical Engineers (ASME), 2021)The optimization of the turbine rotor tip geometry remains a vital opportunity to create more efficient and durable engines. Balancing the aerodynamic and thermal aspects, while maintaining the mechanical integrity, is key ... -
Aerothermal Effect of Cavity Welding Beads on a Transonic Squealer Tip
(The American Society of Mechanical Engineers (ASME), 2021)High-pressure turbine blade tips are critical for gas turbine performance and are sensitive to small geometric variations. For this reason, it is increasingly important for experiments and simulations to consider real ... -
Generalized Predictions of Particle-Vane Retention Probability in Gas Turbine Engines
(The American Society of Mechanical Engineers (ASME), 2021)The ingestion of airborne particulate into aircraft engines is an undesirable consequence of their operation, particularly in and out of arid locations that leads to reduced time between overhaul. Predicting the maintenance ... -
Experimental Investigation on the Rubbing Process of Labyrinth Seals Considering the Material Combination
(The American Society of Mechanical Engineers (ASME), 2021)Labyrinth seals are used to prevent and control the mass flowrate between rotating components. Due to thermally and mechanically induced expansions during operation and transient flight maneuvers, a contact, the so-called ... -
Application of an Immersed Boundary Method on an Instrumented Turbine Blade With Large Eddy Simulation
(The American Society of Mechanical Engineers (ASME), 2021)Leading edge instrumentation used in compressor and turbine blades for jet-engine test rigs can cause significant obstruction and lead to a marked increase in downstream pressure loss. Typical instrumentation used in such ... -
V-Shaped Holes for Full Coverage Film Cooling of a High-Pressure Nozzle Guide Vane
(The American Society of Mechanical Engineers (ASME), 2021)This paper describes an experimental activity carried out to investigate the potential of V-shaped holes for film cooling a high-pressure nozzle guide vane. The newly designed V-shaped scheme was compared with standard ... -
Film Cooling Superposition Theory for Multiple Rows of Cooling Holes With Multiple Coolant Temperatures
(The American Society of Mechanical Engineers (ASME), 2021)The classical method of superposition has been used for several decades to provide an estimate of the adiabatic effectiveness for multiple sets of already well-characterized film cooling hole rows. In this way, design work ... -
Large-Eddy Simulations of High Rossby Number Flow in the High-Pressure Compressor Inter-Disk Cavity
(The American Society of Mechanical Engineers (ASME), 2021)The focus of the present study is to understand the effect of Rayleigh number on a high Rossby number flow in a high-pressure compressor inter-disk cavity. These cavities form between the compressor disks of a gas turbine ... -
Estimation of Aircraft Engine Flight Mission Severity Caused by Erosion
(The American Society of Mechanical Engineers (ASME), 2021)More and more attention is being devoted to assessing severity of the engine operation for a high number of flights in a minimum of time. Compressor erosion is one of the physical phenomena contributing to this severity. ... -
Prediction of the Acoustic Reflection in a Realistic Aeroengine Intake With Three Numerical Methods to Analyze Fan Flutter
(The American Society of Mechanical Engineers (ASME), 2021)For a particular range of frequencies, an acoustic coupling between the fan and the air intake can modify fan stability regarding flutter. Previous works have shown that characterizing the reflection on the intake opening ... -
Deposition of Fuel Impurities Within Thermal Barrier Coatings in Gas Turbine Hot Gas Paths
(The American Society of Mechanical Engineers (ASME), 2021)For the reliable operation of modern gas turbines, thermal barrier coatings (TBCs) need to withstand a wide range of ambient conditions resulting from impurities in inlet air or fuels. When analyzing the deposition of ... -
Experimental Study of Turbulent Flow and Heat Transfer Behaviors Over a Micro-Rib-Dimple-Structured Surface
(The American Society of Mechanical Engineers (ASME), 2021)An experimental study was conducted to characterize the evolution of turbulent boundary layer flow over a micro-rib-dimple-structured surface. In addition to measuring the surface pressure distribution and detailed flow ... -
In-Hole Characteristic Interface and Film Cooling Interface Model
(The American Society of Mechanical Engineers (ASME), 2021)The performance of film cooling is influenced by many parameters, and the nonuniform flow caused by the internal cooling system is found to largely affect the film cooling, which further complicates the in-hole flow and ... -
Experimental and Numerical Study of Laminar-Turbulent Transition on a Low-Pressure Turbine Outlet Guide Vane
(The American Society of Mechanical Engineers (ASME), 2021)This work presents an experimental and numerical investigation of the laminar-turbulent transition and secondary flow structures in a turbine rear structure (TRS). The study was executed at engine representative Reynolds ...