Journal of Turbomachinery: Recent submissions
Now showing items 561-580 of 4519
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Importance of Nonequilibrium Modeling for Compressors
(The American Society of Mechanical Engineers (ASME), 2023)This paper investigates the importance of nonequilibrium boundary-layer modeling for three compressor blade geometries, using RANS and high-fidelity simulations. We find that capturing nonequilibrium effects in RANS is ... -
Turbine Vane Passage Experiments Documenting Evolution of Secondary Flows With Changes in Combustor Coolant Injection Flowrates
(The American Society of Mechanical Engineers (ASME), 2023)A secondary flow system with a dominant passage vortex pattern has been observed in many gas turbine vane passage studies in which there is no upstream coolant injection or only near-passage endwall coolant injection (no ... -
Correlated Pressure–Velocity Instability in a Transonic High-Pressure Turbine Blade
(The American Society of Mechanical Engineers (ASME), 2022)The present work describes the coupled pressure–velocity instability in the suction side boundary layer of a transonic high-pressure turbine blade. The application case is the VKI LS89 turbine blade MUR237. Modal decomposition ... -
Predictive Modeling of Local Film-Cooling Flow on a Turbine Rotor Blade
(The American Society of Mechanical Engineers (ASME), 2022)In the turbine section of a modern gas turbine engine, components exposed to the main gas path flow rely on cooling air to maintain hardware durability targets. Therefore, monitoring turbine cooling flow is essential to ... -
Impacts of the Additive Manufacturing Process on the Roughness of Engine Scale Vanes and Cooling Channels
(The American Society of Mechanical Engineers (ASME), 2022)By leveraging the additive manufacturing (AM) platform, development time and costs for turbine component testing can be reduced relative to traditional investment casting. Surface roughness is a key characteristic of the ... -
Forced Response Induced by Low Engine Order Under Circumferential Inlet Distortions With Different Extents
(The American Society of Mechanical Engineers (ASME), 2022)Boundary-layer ingestion systems have the potential to improve propulsion efficiency using fluid with lower momentum near the airframe. However, they also bring variations in the velocity and total pressure, leading to a ... -
Casing Treatment: Its Potential and Limitations
(The American Society of Mechanical Engineers (ASME), 2022)Casing treatment is an advanced design feature intended to improve the stability of a compressor. Various investigations have been conducted based on both experimental and numerical studies at least over the last 50 years. ... -
Temperature Dependent Property Considerations for Biot Number Matching With Composite Materials
(The American Society of Mechanical Engineers (ASME), 2022)High-temperature materials such as ceramic matrix composites (CMCs) are promising for advancements in gas turbine engines; however, experimental techniques are necessary to characterize the thermal behavior of high-temperature ... -
New Concept for Design in Turbomachinery Applications Using Full RANS Gradient Methodology
(The American Society of Mechanical Engineers (ASME), 2022)Centrifugal compressors are mainly designed with the best efficiency point in mind and the focus oriented toward the impeller. The vaned diffuser geometry is usually developed using simple shapes, such as prismatic blades ... -
The Influence of Boundary Layer State and Trailing Edge Wedge Angle on the Aerodynamic Performance of Transonic Turbine Blades
(The American Society of Mechanical Engineers (ASME), 2022)Trailing edge loss typically accounts for a third of the profile loss of a transonic turbine blade. In this paper, two dominant influencing factors—boundary layer state and trailing edge wedge angle—are quantified using a ... -
Experimental Investigation of Flame-Film Cooling Interactions With an Academic Test Rig and Optical Laser Diagnostics
(The American Society of Mechanical Engineers (ASME), 2022)The development of lighter low-carbon technologies in the aviation sector raises a technological challenge regarding material durability and wall thermal management. This study aims to introduce a new optically accessible ... -
Annular Dump Diffuser and Deswirl System for Back-Pressure Control in Engine-Scale Transonic Annular Cascade
(The American Society of Mechanical Engineers (ASME), 2022)A common requirement for turbomachinery testing facilities is the ability to independently control Mach number and Reynolds number. In practice, this means independent control of the inlet total pressure and exit static ... -
The Importance of Shape in Particle Rebound Behaviors
(The American Society of Mechanical Engineers (ASME), 2022)Physics-based particle rebound models are essential for the accurate tracking of particles in aero engines. Current models are often informed by analysis of spherical particle impact, but particles ingested in engines ... -
Stall Margin Improvement in a Transonic Compressor With a Casing Treatment: Flow Mechanism
(The American Society of Mechanical Engineers (ASME), 2022)A compressor casing treatment with circumferential casing grooves (CCGs) is studied in detail. The primary objective of the current paper is to unearth the main driving fluid mechanism that changes the stall margin in a ... -
Numerical Investigation of Near-Tip Modifications for a Highly Loaded Low-Speed Rotor Under the Influence of Double Leakage
(The American Society of Mechanical Engineers (ASME), 2022)This paper numerically investigates the flow field in the tip region of a highly loaded axial low-speed compressor rotor. The rotor in focus is of a hybrid blade configuration, featuring a tandem profile in the mid-span ... -
Development of Translucent Design Philosophy for the Cyclic Pattern Design of Fan Outlet Guide Vanes
(The American Society of Mechanical Engineers (ASME), 2022)The fan systems of typical high bypass civil engines encounter strong flow distortions originating in the intake and the bypass duct. These flow distortions cause the fan stage operation point to vary from its design intent, ... -
Metamodel-Interpreted Data Mining for Stability and Efficiency Enhancement of Multistage Axial-Flow Compressors
(The American Society of Mechanical Engineers (ASME), 2022)The tradeoff between higher efficiency and wider stability of performance map is still one of the bottlenecks to hamper the further research and development of advanced multistage axial-flow compressor. The recent rapid ... -
A Framework for Estimating Effects of Combustor Turbulence on Turbine Profile Loss Generation
(The American Society of Mechanical Engineers (ASME), 2023)This paper describes a framework to quantify the effect of freestream turbulence, generated by mixing processes in a combustor, on turbulent boundary layer loss generation in the high-pressure turbine downstream of the ... -
Printability and Overall Cooling Performance of Additively Manufactured Holes With Inlet and Exit Rounding
(The American Society of Mechanical Engineers (ASME), 2023)To improve cooling effectiveness of gas turbine hardware, various film cooling hole shapes have previously been researched. Unique design modifications have recently been made possible through the design freedom allotted ... -
Impact of Ceramic Matrix Composite Topology on Overall Effectiveness
(The American Society of Mechanical Engineers (ASME), 2022)Ceramic matrix composites (CMCs) are a material of interest for components in the hot section of gas turbine engines due to their high strength-to-weight ratio and high temperature capabilities. CMCs are a class of material ...