Journal of Turbomachinery: Recent submissions
Now showing items 421-440 of 4519
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Analyzing Unsteady Turbomachinery Flow Simulations With Mixing Entropy
(The American Society of Mechanical Engineers (ASME), 2024)The prediction of unsteady aerodynamic loads is a central problem during the design of turbomachinery. Over the last 20 years, harmonic balance methods have been shown to be highly efficient for this task. A CPU-cost optimal ... -
Measurements of Turbulence in Compressible Low-Density Flows at the Inlet of a Transonic Linear Cascade With and Without Unsteady Wakes
(The American Society of Mechanical Engineers (ASME), 2024)In the present work, hot-wire anemometry was employed for the characterization of the turbulent field at the inlet of a high-speed low-pressure turbine cascade, in terms of turbulence intensity and integral length scales. ... -
Numerical Investigation of the Interaction of a Circumferential Groove Casing Treatment and Near-Tip Modifications for a Highly Loaded Low-Speed Rotor Under the Influence of Double Leakage
(The American Society of Mechanical Engineers (ASME), 2024)Eckel et al. (2023, “Numerical Investigation of Near-Tip Modifications for a Highly Loaded Low-Speed Rotor Under the Influence of Double Leakage,” ASME J. Turbomach., 145(4), p. 041003) proposed using a convex-profiled ... -
Design and Cooling Performance of Additively Manufactured Ceramic Turbine Vanes
(The American Society of Mechanical Engineers (ASME), 2024)Ceramic materials are of significant interest in aviation and power generation gas turbine engines due to their low density and ability to withstand high temperatures. Increased cycle thermal efficiency and higher specific ... -
Windage Torque Reduction in Low-Pressure Turbine Cavities Part I: Concept Design and Numerical Investigations
(The American Society of Mechanical Engineers (ASME), 2024)The windage torque on rotational walls has a negative effect on the performance of the low-pressure turbine. In this paper, three novel flow control concepts (FCCs) were proposed to reduce the windage torque within a turbine ... -
Extension and Validation of the Turbomachinery Capabilities of SU2 Open Source Computational Fluid Dynamic Code
(The American Society of Mechanical Engineers (ASME), 2024)Computational Fluid Dynamic (CFD) tools have revolutionized the way to design engineering systems, but most established codes are proprietary and closed-source, making it difficult, if not impossible, to modify, debug, or ... -
Computationally Efficient Workflow for Conjugate Heat Transfer With Large Eddy Simulation for Gas Turbine Combustors
(The American Society of Mechanical Engineers (ASME), 2024)Typical gas turbine combustor (GTC) and high-pressure turbine stage generally employs 10,000 to 100,000 small passages of cooling holes. Such an arrangement protects the solid walls through impingement and effusion cooling. ... -
Unsteady Investigation of Intermediate Turbine Ducts Under the Influence of Purge Flows
(The American Society of Mechanical Engineers (ASME), 2024)The aerodynamic flow field at the outlet of a high-pressure turbine (HPT) stage in a modern turbofan engine is highly unsteady and strongly influenced by periodic fluctuations from the HPT rotor, also interacting with the ... -
Experimental Investigation of Additional Loss Associated With Incoming Wakes in Low-Pressure Turbine Cascades
(The American Society of Mechanical Engineers (ASME), 2024)The present paper aims to experimentally investigate the influence of wake-passing frequency, Reynolds number, and suction surface diffusion rate on the additional loss due to incoming wakes to the profile loss in the ... -
Effects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by Crossflow
(The American Society of Mechanical Engineers (ASME), 2024)Counter-rotating vortices, formed by the interaction of film-cooling jets and the hot gas flow, adversely affect the performance of conventional film-cooling designs. Downstream vortex generators have been shown to improve ... -
Improvements in the Prediction of Steady and Unsteady Transition and Mixing in Low-Pressure Turbines by Means of Machine-Learnt Closures
(The American Society of Mechanical Engineers (ASME), 2024)In this article, novel machine-learnt transition and turbulence models are applied to the prediction of boundary-layer transition and wake mixing in a low-pressure turbine (LPT) cascade, including unsteady inflow cases ... -
An Improved Passage-Flow Turning Model for Forward-Curved Blades of Squirrel-Cage Fan
(The American Society of Mechanical Engineers (ASME), 2024)An improved passage-flow turning model (IPTM) was developed in this study to design high-performance forward-curved blades for squirrel-cage fans. The flow separation in blade passages and the corresponding fan performance ... -
TPIV Experimental Investigation of Film Coolant-to-Mainstream Interaction From Shaped Cooling Holes With Various Inlet Geometries
(The American Society of Mechanical Engineers (ASME), 2024)In this investigation, multiple sets of time-averaged tomographic particle imaging velocimetry measurements are completed for laid-back, fan-shaped film cooling holes with “racetrack” shaped inlets. Traditional 10-10-10, ... -
Effects of Water-to-Air Mass Ratio on Long-Term Washing Efficiency and Erosion Risk in an Axial Compressor Under Online Washing Conditions
(The American Society of Mechanical Engineers (ASME), 2024)One of the main reasons for gas turbines’ performance losses is the deposition of dirt on the compressor blades. Dirt deposit has to be periodically removed to keep the engine performance as high as possible. This is the ... -
Evaluation of Cooling Requirements for Rotating Detonation Combustors
(The American Society of Mechanical Engineers (ASME), 2024)In the last decade, the rotating detonation combustor (RDC) has received growing attention among the different pressure gain combustion concepts due to the simplicity of the design and the potential ease of integration in ... -
Pressure Sensitive Paint and Large Eddy Simulation Investigation on the Impact of Trench Depth on Flat Plate Film Cooling Through Shaped Holes
(The American Society of Mechanical Engineers (ASME), 2023)To increase film cooling effectiveness levels downstream of film cooling holes, trenches manufactured in the thermal barrier coating can be adopted. The performance of this solution depends on the trench geometrical ... -
Analysis of Cavity Disk Heat Transfer by Solving Inverse Heat Transfer Problem
(The American Society of Mechanical Engineers (ASME), 2023)The flow and heat transfer within compressor rotor cavities of aero-engines is a conjugate problem. The operating conditions buoyancy forces, caused by radial temperature difference between the cold throughflow and the ... -
Transient Tip Clearance Prediction Model Considering Transient Radial Temperature Distribution of Discs in a Gas Turbine Engine
(The American Society of Mechanical Engineers (ASME), 2023)The tip clearance of turbomachinery components, such as compressor and turbine, significantly impacts the gas turbine engine performance, including the thrust and fuel consumption. Therefore, an appropriate prediction of ... -
Rapid Algorithmic Blade Design Applying Machine Learning From Shape Optimization to Satisfy Multidisciplinary Constraints
(The American Society of Mechanical Engineers (ASME), 2023)This paper presents a new, rapid, flexible approach for turbine blade section design combining algorithmic and inverse techniques to enable automatic generation of blade sections guaranteed to conform to multidisciplinary ... -
Unsteady Pre-Stall Behavior in a Centrifugal Compressor With Vaned Diffuser
(The American Society of Mechanical Engineers (ASME), 2023)Unsteady pre-stall behavior in a centrifugal compressor with a vaned diffuser was investigated by experimental and numerical analysis. The pre-stall disturbances occurred at a slightly higher flow coefficient at the stall ...