Journal of Turbomachinery: Recent submissions
Now showing items 501-520 of 4519
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Unsteady Structure of Compressor Tip Leakage Flows
(The American Society of Mechanical Engineers (ASME), 11/25/2022)Direct numerical simulations (DNS) are performed of a cantilevered stator blade to identify the unsteady and turbulent flow structure within compressor tip flows. The simulations were performed with clearances of 1.6% and ... -
Effect of Upstream Leakage Flow on Film Cooling Characteristic of a Turbine Convex Endwall
(The American Society of Mechanical Engineers (ASME), 8/29/2023 )This paper investigates the effect of upstream leakage coolant flow on the film cooling performance of the convex endwall. The experiment is conducted in an annular passage with four vanes, and the endwall film cooling ... -
Excitation of a Separated Flow by a Series of Protuberances Near the Leading Edge of a Model Aerofoil
(The American Society of Mechanical Engineers (ASME), 8/16/2023 )This article documents the manifestation of a shear layer under the excitation of a series of hemispherical protuberances near the leading edge of a constant-thickness airfoil. The experiments are performed at a Reynolds ... -
On the Over-Prediction of Centrifugal Compressor Pressure Ratio in the High Impeller Tip Mach Number Regime
(The American Society of Mechanical Engineers (ASME), 8/16/2023 )Reynolds-averaged Navier–Stokes (RANS) simulation is a routinely used tool for turbomachinery research and development, but it often over-predicts the pressure ratio of centrifugal compressors especially in the high impeller ... -
Film Cooling on Turbine Vane Endwalls With Different Inlet Cooling Configurations: Experimental and Computational Results
(The American Society of Mechanical Engineers (ASME), 8/16/2023 )A comparative study of turbine endwall film cooling resulting from three different cooling configurations in front of the passage inlet was conducted. The three inlet cooling configurations considered in this study were a ... -
Effects of Ribbed Surfaces on Profile Losses of Low-Pressure Turbine Blades
(The American Society of Mechanical Engineers (ASME), 8/16/2023 )In this work, streamwise oriented riblets were installed on a flat plate exposed to an adverse pressure gradient typical of low-pressure turbine (LPT) blade and, successively, on the suction side of an LPT cascade operating ... -
Using Data Assimilation to Improve Turbulence Modeling for Inclined Jets in Crossflow
(The American Society of Mechanical Engineers (ASME), 8/16/2023 )Data assimilation (DA) integrating limited experimental data and computational fluid dynamics is applied to improve the prediction accuracy of flow and mixing behavior in inclined jet-in-crossflow (JICF). The ensemble ... -
Film Cooling Effectiveness on Pressure Surface and Suction Surface of Turbine Guide Vane With Diffusion Slot Holes
(The American Society of Mechanical Engineers (ASME), 8/16/2023 )This paper investigated the film-cooling effectiveness of diffusion slot holes in a turbine nozzle guide vane. The pressure-sensitive paint measurement technique was employed to obtain the film-cooling effectiveness at a ... -
Turbine Vane Passage Cooling Experiments With a Close-Coupled Combustor–Turbine Interface Geometry Part II: Describing the Coolant Coverage
(The American Society of Mechanical Engineers (ASME), 8/2/2023 1)The first-stage gas turbine vane surfaces and endwalls require aggressive cooling. This two-part paper introduces a modified design of the combustor–turbine (C–T) interface, the “close-coupled interface,” that is expected ... -
Turbine Vane Passage Cooling Experiments With a Close-Coupled Combustor-Turbine Interface Geometry—Part I: Describing the Flow
(The American Society of Mechanical Engineers (ASME), 8/2/2023 1)Due to the proximity of the first-stage gas turbine vanes to the combustor, coolant introduced to the combustor walls interacts with the endwall film coolant and changes the vane passage flow physics. Recent results show ... -
Application of a Distributed Element Roughness Model to Additively Manufactured Internal Cooling Channels
(The American Society of Mechanical Engineers (ASME), 7/28/2023 )Design for cooling effectiveness in turbine blades relies on accurate models for dynamic losses and heat transfer of internal cooling passages. Metal additive manufacturing (AM) has expanded the design space for these ... -
Body Force Modeling of the Fan Stage of a Windmilling Turbofan
(The American Society of Mechanical Engineers (ASME), 7/28/2023 )The determination of the rotational speed and massflow of the fan of a turbofan at windmill is critical in the design of the engine-supporting structure and the sizing of the vertical stabilizer. Given the very high bypass ... -
Multi-Objective Aerodynamic and Aeroelastic Coupled Design Optimization Using a Full Viscosity Discrete Adjoint Harmonic Balance Method
(The American Society of Mechanical Engineers (ASME), 7/27/2023 )With increasing requirements for high-loading and high-efficiency turbomachines, blades become thinner and thinner and thus design optimizations considering both aerodynamic performances and aeroelastic stability become ... -
Quasi-Dynamic Approximation of Unsteady Pressure Distribution for Transonic Airfoils in Flutter
(The American Society of Mechanical Engineers (ASME), 2023)A lack of reliable experimental data on transonic blade flutter in real turbomachines hampers the further improvement of computational design predictions for off-design operation regimes of newly-built machines. Acquiring ... -
Manufacturing a Ceramic Turbine Rotor for a Compact Jet Engine
(The American Society of Mechanical Engineers (ASME), 2023)Compact military-grade jet engines offer many potential applications, including use in remotely piloted vehicles, but can be expensive to use for research and development purposes. A study aimed at increasing the power and ... -
Effect of Solidity and Aspect Ratio on the Aerodynamic Performance of Axial-Flow Fans With 0.2 Hub-to-Tip Ratio
(The American Society of Mechanical Engineers (ASME), 2023)Aspect ratio and solidity play complementary roles in the aerodynamic design of axial fan rotor blades. Few studies have experimented the effect of the aspect ratio of rotor blades on the performance of low-speed axial ... -
Assessment of a Conjugate Heat Transfer Method on an Effusion Cooled Combustor Operated With a Swirl Stabilized Partially Premixed Flame
(The American Society of Mechanical Engineers (ASME), 2023)Computational fluid dynamics (CFD) plays a crucial role in the design of cooling systems in gas turbine combustors due to the difficulties and costs related to experimental measurements performed in pressurized reactive ... -
Upstream Jet Cooling and Dual Cavity Slashface Leakage Cooling on a Transonic Nozzle Guide Vane Endwall
(The American Society of Mechanical Engineers (ASME), 2023)This paper presents an experimental and computational study on implementing a dual cavity slashface cooling scheme on the thermal performance for the first stage nozzle guide vane with an axisymmetric, converging endwall. ... -
A Method for Predicting the Aeroelastic Response of Radial Turbomachines
(The American Society of Mechanical Engineers (ASME), 2023)Aircraft intermittent combustion engines often incorporate turbochargers adapted from ground-based applications to improve their efficiency and performance. These turbochargers can operate at off-design conditions and ... -
Accounting for Circumferential Flow Nonuniformity in a Multistage Axial Compressor
(The American Society of Mechanical Engineers (ASME), 2023)The flow field in a compressor is circumferentially nonuniform due to geometric imperfections, inlet flow nonuniformities, and blade row interactions. Therefore, the flow field, as represented by measurements from discrete ...