Journal of Turbomachinery: Recent submissions
Now showing items 541-560 of 4519
-
Cooling and Flow Characteristics of Multi-Channel Wall Jet Structure With Film Holes at Blade Leading Edge
(The American Society of Mechanical Engineers (ASME), 2023)Efficient cooling is imperative for gas turbine blades that suffer from hot gas erosion. Cooling and flow characteristics of multi-channel wall jet structure combined with film holes for blade leading edge are numerically ... -
Experimental and Numerical Investigation of High Load Turbine Blade Tip Cavity Structures
(The American Society of Mechanical Engineers (ASME), 2023)Leakage flow loss is an important factor affecting the aerodynamic efficiency of turbines. In this paper, experimental and numerical computational studies were used to investigate three different tips of a highly loaded ... -
Calculating Cooled Turbine Efficiency With Weighted Cooling Flow Distributions
(The American Society of Mechanical Engineers (ASME), 2023)The ability to accurately characterize the thermal efficiency of turbine stages with cooled components is essential to advance turbine technologies. There are many methods for calculating aerodynamic efficiency of ... -
LES-CHT for a Rotating Cavity With Axial Throughflow
(The American Society of Mechanical Engineers (ASME), 2022)The flow and heat transfer within rotating cavities is often discussed as a conjugate problem; the temperature distribution within the cavity disks drives the large-scale flow structure within the cavity, and the cavity ... -
Numerical Study of Crossflow Effects on Discharge Coefficient of the Converging Slot Hole
(The American Society of Mechanical Engineers (ASME), 2022)Converging slot hole is considered as a high-performance film hole with excellent film cooling effectiveness and relatively low aerodynamic loss. Previous studies on converging slot holes mainly focused on the film cooling ... -
Influence of Purge Flow Injection on the Performance of an Axial Turbine With Three-Dimensional Airfoils and Non-Axisymmetric Endwall Contouring
(The American Society of Mechanical Engineers (ASME), 2022)In this paper, we present the evaluation of the aerodynamic robustness to rim seal purge flow of an optimized 1.5-stage axial turbine configuration with a bowed stator profile and endwall contouring. Performance maps ... -
Experimental Study of Film Cooling With Favorable and Adverse Pressure Gradients
(The American Society of Mechanical Engineers (ASME), 2022)Film cooling experiments were conducted on a flat wall subject to favorable and adverse pressure gradients with a constant acceleration parameter, K. The test wall included a single row of five round holes in line with the ... -
Experimental Subsonic Flutter of a Linear Turbine Blade Cascade With Various Mode Shapes and Chordwise Torsion Axis Locations
(The American Society of Mechanical Engineers (ASME), 2022)Axial flow turbomachinery is susceptible to self-excited vibrations known as flutter, primarily affecting high-aspect ratio rotor blades. Experimental studies of blade flutter are essential to understanding the phenomenon. ... -
Response of Separated Boundary Layers to Steady and Pulsated Flow Injection
(The American Society of Mechanical Engineers (ASME), 2022)A new class of power generation devices that experiences increased losses due to bulk flow separation in segments of their expected in-flight regime is emerging. As such, active flow control becomes increasingly relevant ... -
Leakage Flow Impact on Shrouded Stator Cavity Flow Topology and Associated High-Speed Axial Compressor Stage Performance
(The American Society of Mechanical Engineers (ASME), 2023)This paper presents the investigation of realistic cavity leakage flow for the von Karman Institute for Fluid Dynamics H25 axial compressor stage, equipped with a shroud cavity of average Reynolds number Rer = 2.2 * 106 ... -
Unpacking Intermineral Synergies and Reactions During Dust Deposition in an Impingement Coolant Jet
(The American Society of Mechanical Engineers (ASME), 2022)This paper seeks to unpack synergies that exist between minerals during deposition of the heterogeneous AFRL02 mixture in gas turbine engines and demonstrate that the contributions of each mineral cannot be considered ... -
Impacts of Pin Fin Shape and Spacing on Heat Transfer and Pressure Losses
(The American Society of Mechanical Engineers (ASME), 2022)Additive manufacturing (AM) provides designers with the freedom to implement many designs that previously would have been costly or difficult to traditionally manufacture. This experimental study leverages this freedom and ... -
Aeromechanical Optimization of Scalloping in Mixed Flow Turbines
(The American Society of Mechanical Engineers (ASME), 2022)Scalloping of radial and mixed-flow turbocharger turbine rotors has been commonplace for many years as a means of inertia reduction and stress relief. The interest in turbine rotor inertia reduction is driven by transient ... -
Impact of Trailing Edge Overhang Length on the Loss Characteristics of Fully Cooled Transonic Nozzle Guide Vanes
(The American Society of Mechanical Engineers (ASME), 2022)The trailing edge (TE) design of a cooled high-pressure (HP) nozzle guide vane (NGV) requires consideration of both cooling and aerodynamic performances. Two designs are in common use: the centered-ejection design, in which ... -
Effects of Upstream Wakes on the Boundary Layer Over a Low-Pressure Turbine Blade
(The American Society of Mechanical Engineers (ASME), 2022)In the present work, the evolution of the boundary layer over a low-pressure turbine blade is studied using direct numerical simulations, with the aim of investigating the unsteady flow field induced by the rotor-stator ... -
An Investigation of Non-Linear Surge Characteristic in a High-Speed Centrifugal Compressor
(The American Society of Mechanical Engineers (ASME), 2022)In centrifugal compressors, it is common to observe a rapid reduction in surge margin toward high rotational speed, which shows a non-linear surge characteristic against the change of rotational speed. This paper presents ... -
Investigation of Surge in a Transonic Centrifugal Compressor With Vaned Diffuser: Part II—Correlation With Subcomponent Characteristics
(The American Society of Mechanical Engineers (ASME), 2022)In the first part of the paper, surge signatures and the underlying mechanisms thereof for a high-speed centrifugal compressor were investigated using signals from fast-response transducers installed along the flow path. ... -
Investigation of Surge in a Transonic Centrifugal Compressor With Vaned Diffuser—Part I: Surge Signature
(The American Society of Mechanical Engineers (ASME), 2022)The identification of stall inception mechanisms and stability-limiting components in a centrifugal compressor is required for the development of effective surge suppression approaches. Part I of this two-part paper ... -
The Role of Turbine Operating Conditions on Combustor–Turbine Interaction—Part II: Loading Effects
(The American Society of Mechanical Engineers (ASME), 2022)Aero-engine combustors burn a lean and premixed blend releasing vorticity and temperature perturbations. Interacting with the first turbine stage, these disturbances impact the cascade aerodynamics, add criticality to the ... -
The Role of Turbine Operating Conditions on Combustor–Turbine Interaction—Part I: Change in Expansion Ratio
(The American Society of Mechanical Engineers (ASME), 2022)Aeroengine lean-burn combustors release vorticity and temperature perturbations that, interacting with the first turbine stage, impact the stage aerodynamics, the blade cooling, and noise production. The first of these ...