Journal of Turbomachinery: Recent submissions
Now showing items 141-160 of 4312
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Analysis of Ingress Into the Downstream Wheel Space of a 1.5-Stage Turbine By Full Circumference and Single Blade Passage Large-Eddy Simulations
(The American Society of Mechanical Engineers (ASME), 2024)The flow in a 1.5-stage axial turbine is investigated by large-eddy simulations. The focus is on the ingress in the downstream wheel space. Two setups are considered. In the first, the full 360 deg annulus is included on ... -
A Data-Driven Approach for Generalizing the Laminar Kinetic Energy Model for Separation and Bypass Transition in Low- and High-Pressure Turbines
(The American Society of Mechanical Engineers (ASME), 2024)No common laminar kinetic energy (LKE) transition model has to date been able to predict both separation-induced and bypass transition, both phenomena commonly found in low-pressure turbines and high-pressure turbines. ... -
Impact of Flow Unsteadiness on Turbine Airfoil Heat Transfer via Streaming
(The American Society of Mechanical Engineers (ASME), 2024)Thermal management of turbine airfoils is a critical design consideration, but the impact of unsteadiness on heat transfer of attached flow regions has received less attention in the literature. When turbine surfaces are ... -
Adaptive Batch Sampling Strategy for the Hundreds-Dimensional Aerodynamic Optimization of the Centrifugal Impeller
(The American Society of Mechanical Engineers (ASME), 2024)In recent years, in order to achieve higher performance, the number of design variables used in the aerodynamic optimization of turbomachinery (based on surrogate models) has increased significantly. However, the increase ... -
Overall Cooling Effectiveness With Internal Serpentine Channels and Optimized Film Cooling Holes
(The American Society of Mechanical Engineers (ASME), 2024)The overall cooling effectiveness for gas turbine airfoils is a function of the combined cooling due to internal cooling configurations and film cooling configurations. Typically, film cooling configurations are evaluated ... -
Numerical Characterization of Prestall Disturbances in a Compressor Stage
(The American Society of Mechanical Engineers (ASME), 2024)Compared to the subject of rotating stall, less attention has been given to prestall flow disturbances in turbomachinery. This is mostly due to the fact that these phenomena, often referred to as Rotating Instabilities, ... -
Comparison of Eddy Viscosity Models for High Turbulence Nozzle Guide Vane Flows
(The American Society of Mechanical Engineers (ASME), 2024)In this paper we investigate the performance of eddy viscosity turbulence models for high-pressure nozzle guide vane (NGV) flows with engine-realistic turbulence. Using metrics such as integrated kinetic energy (KE) loss ... -
Impacts of Superalloys on the Surface Quality of Additively Manufactured Channels
(The American Society of Mechanical Engineers (ASME), 2024)Gas turbines feature many components that require superalloys capable of handling extreme thermal environments. Increasing the selection of materials available for these components is important to their use in these extremely ... -
Experimental Research Into Aeroelastic Phenomena in Turbine Rotor Blades Inside ARIAS EU Project
(The American Society of Mechanical Engineers (ASME), 2024)This paper describes an aeroelastic experimental campaign on a low-pressure turbine-bladed rotor in a rotating wind tunnel that took place as a part of the Advanced Research Into Aeromechanical Solutions (ARIAS) EU project. ... -
Unsteady Aerodynamic Forcing Due to Distortion in a Boundary Layer Ingesting Fan
(The American Society of Mechanical Engineers (ASME), 2024)Boundary Layer Ingestion (BLI) is a concept with the potential to reduce energy consumption needed for aircraft propulsion. For the fan this results in a need to work well in an environment of increased continuous distortion. ... -
Block Spectral Method Analysis for Turbomachinery Applications
(The American Society of Mechanical Engineers (ASME), 2024)The block-wise spectral reconstruction of turbomachinery flows has been successfully used in the past to reduce the computational cost of full-annulus turbomachinery simulations. The rationale of the method is based on an ... -
A New Axial Compressor Test Facility for the Investigation of Aerodynamic Damping Featuring an Electromagnetic Excitation System
(The American Society of Mechanical Engineers (ASME), 2024)Aerodynamic damping simulations involving detailed computational fluid dynamics (CFD) models are nowadays an integral part of turbomachinery design processes, thanks to advancements made in simulation tools and in computer ... -
Identification of the Aeromechanical Parameters of a Compressor Rotor from Blade Tip Timing Data
(The American Society of Mechanical Engineers (ASME), 2024)This article presents a maximum likelihood approach to identifying the mistuning, aerodynamic forcing functions, and aerodynamic influence coefficients of compressor rotor blades from noisy experimental measurements of ... -
UHBR Open-Test Case Fan ECL5/CATANA: Non-Linear Analysis of Non-Synchronous Blade Vibration at Part-Speed Conditions
(The American Society of Mechanical Engineers (ASME), 2024)The onset of non-synchronous vibrations has been predicted for a composite open-test-case UHBR fan geometry by time-linearized simulations at part-speed conditions. In the current study, time-accurate simulations with ... -
Numerical Investigation of Classic Flutter Mechanism Under Circumferentially Non-Uniform Inlet Condition
(The American Society of Mechanical Engineers (ASME), 2024)Over recent years, the aeroelastic problem of fan blades has become significantly serious due to the demand for high performance of aero-engines. To explore the aeroelastic issue of flutter, fan instability is represented ... -
Mid-Span Stall Inception in Low-Pressure-Ratio Transonic Fans
(The American Society of Mechanical Engineers (ASME), 2024)In this paper, steady and unsteady computational fluid dynamics (CFD) have been used to investigate stall inception for a modern low-pressure-ratio transonic fan. The computational results are validated against measurement ... -
Investigating the Suitability of Multi-Scroll Volutes for Improving Spanwise Incidence of Mixed Flow Turbine Rotors With Varying Blade Cone Angles in Automotive Turbocharging Applications
(The American Society of Mechanical Engineers (ASME), 2024)Targets to reduce fuel consumption and reduce CO2 emissions have been met using engine downsizing and turbocharging. In automotive applications, it is important that the turbocharger responds well to transient events and ... -
Modeling of Combustor Non-Uniformities Evolution Through a High-Pressure Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2024)In modern gas turbines, the reduction of pollutant emissions can be achieved by employing lean-burn combustors. At the combustion chamber outlet, the flow is non-uniform and characterized by a residual swirl superimposed ... -
A New Multi-Stage Turbine Stator Design for Improved Performance Retention
(The American Society of Mechanical Engineers (ASME), 2024)An experimental and computational investigation has been undertaken into the effects of deterioration of the first-stage rotor-shroud knife-edge seal clearance in a two-stage turbine that has engine-representative cavity ... -
Experimental Analysis of Additively Manufactured Latticework Coupons
(The American Society of Mechanical Engineers (ASME), 2024)The capabilities and the precision of additive manufacturing processes have been tremendously increased in the last years, and this trend is not expected to be close to an end. Researchers, in the gas turbine industry, are ...