Journal of Turbomachinery: Recent submissions
Now showing items 641-660 of 4519
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On Choosing the Optimal Impeller Exit Velocity Triangles in Preliminary Design
(The American Society of Mechanical Engineers (ASME), 2022)Impeller discharge flow plays an important role in centrifugal compressor performance and operability for two reasons. First, it determines the work factor and relative diffusion for the impeller. Second, it sets the flow ... -
A Shock Loss Reduction Method Using a Concave Suction Side Profile for a Zero Inlet Swirl Turbine Rotor
(The American Society of Mechanical Engineers (ASME), 2022)A zero inlet swirl turbine rotor (ZISTR) works with axial inlet gas flow directly exhausted from a combustion chamber without any upstream vanes. The suction side trailing edge shock of the ZISTR generates a significant ... -
Applying Infrared Thermography as a Method for Online Monitoring of Turbine Blade Coolant Flow
(The American Society of Mechanical Engineers (ASME), 2022)As gas turbine engine manufacturers strive to implement condition-based operation and maintenance, there is a need for blade monitoring strategies capable of early fault detection and root-cause determination. Given the ... -
Analysis of the Unsteady Flow Field at Stall Conditions for a Low-Speed Low-Pressure Ratio Axial Fan With Full-Annulus Simulation
(The American Society of Mechanical Engineers (ASME), 2022)The present work analyzes the three-dimensional unsteady flow structure of a low-speed low-pressure ratio axial fan stage operating at stall conditions. Unsteady numerical simulations were conducted with the elsA software, ... -
High-Resolution Thermal Profiling of a Combustor in a Non-Dedicated Test Using Thermal History Coatings
(The American Society of Mechanical Engineers (ASME), 2022)The requirement for reduced emissions and the growing demand for gas turbine efficiency are in part met through increasing firing temperatures. However, development budgets leave only limited time for dedicated thermal ... -
Thermal Performance of Double-Sided, Partial Height Strip Fin Arrays in a High Aspect Ratio, Rectangular Channel
(The American Society of Mechanical Engineers (ASME), 2022)Friction loss and heat transfer enhancement measurements were obtained for double-sided, partial height, strip fin arrays in a high aspect ratio (AR = 8), rectangular channel. Fins were arranged in a staggered array ... -
Zonal Detached Eddy Simulation of the Fan-Outlet Guide Vanes Stage of a Turbofan Engine: Part II—Broadband Noise Predictions
(The American Society of Mechanical Engineers (ASME), 2022)This paper (Part II) presents the broadband noise predictions of a turbofan stage based on a hybrid method proposed by ONERA in the framework of the European project TurboNoiseBB. The numerical approach relies on a ZDES ... -
Zonal Detached Eddy Simulation of the Fan-Outlet Guide Vanes Stage of a Turbofan Engine: Part I—Methodology, Numerical Setup, and Aerodynamic Analysis
(The American Society of Mechanical Engineers (ASME), 2022)This article deals with the zonal detached eddy simulation of the fan module of a modern turbofan engine for the prediction of the broadband noise due to the interaction of the fan turbulent wakes with the stationary outlet ... -
Effect of Spanwise Hole-to-Hole Spacing on Overall Cooling Effectiveness of Effusion Cooled Combustor Liners for a Swirl-Stabilized Can Combustor
(The American Society of Mechanical Engineers (ASME), 2022)One of the most effective ways to cool the combustor liner is through effusion cooling. Effusion cooling (also known as full-coverage effusion cooling) involves uniformly spaced holes distributed throughout the combustor ... -
Investigation on the Contribution of Large-Scale Fluctuation and Small-Scale Disturbance of Coolant to Heat Transfer Enhancement in a Rectangular Channel With Pin Fins
(The American Society of Mechanical Engineers (ASME), 2022)The flow field in a channel with staggered pin-fin array was measured using time-resolved Particle Imaging Velocimetry (PIV). The distributions of flow field statistics were compared with those of Nusselt number on the ... -
Influence of Vane Trailing Edge Flow on the Formation of Cavity Cells and Rim Sealing
(The American Society of Mechanical Engineers (ASME), 2022)Hot gas ingestion into the turbine rim seal cavity is an important concern for engine designers. To prevent ingestion, rim seals use high-pressure purge flow; however, the penalty is that excessive use of the purge flow ... -
Enhancing Turbine Deposition Prediction Capability With Conjugate Mesh Morphing
(The American Society of Mechanical Engineers (ASME), 2022)A framework for performing mesh morphing in a conjugate simulation in the commercial computational fluid dynamics (CFD) software ansys fluent is presented and validated. A procedure for morphing both the fluid and solid ... -
Aerodynamic Interaction of Volute With Rotor in a Nozzleless Radial Turbine
(The American Society of Mechanical Engineers (ASME), 2022)Aerodynamic interaction of rotor with stator is the primary cause of high cycle fatigue of radial turbine blade. However, few studies have been carried out on aerodynamic interaction in nozzleless radial turbines. This ... -
A Detailed Loss Analysis Methodology for Centrifugal Compressors
(The American Society of Mechanical Engineers (ASME), 2022)A deep understanding of loss mechanisms inside a turbomachine is crucial for the design and analysis work. By quantifying the various losses generated from different flow mechanisms, a targeted optimization can be carried ... -
Analysis of Large Eddy Simulations and 1D Hot-Wire Data to Determine Actively Generated Main Flow Turbulence in a Film Cooling Test Rig
(The American Society of Mechanical Engineers (ASME), 2022)Active turbulence generators were incorporated into a wind tunnel to investigate more realistic inflow conditions for a film cooling test rig. The flow field signals are sampled numerically by probes in large eddy simulations ... -
Physics and Instantaneous Performance of Radial Turbines in Unsteady Flows: Validity of the Quasi-Steady Assumption for the Rotor
(The American Society of Mechanical Engineers (ASME), 2022)Radial turbines are frequently submitted to unsteady inlet flows, for example, in turbocharging applications. Complex flows dominated by waves propagation take place, and advanced methodologies are required. Such complexity ... -
The Unsteady Topology of Corner Separations
(The American Society of Mechanical Engineers (ASME), 2022)As a compressor is throttled three-dimensional separations develop in the corners between the blades and annulus endwall. Surprisingly, little is understood about the unsteady topology of these separations. One of the ... -
Investigating the Influence of Mainstream Turbulence and Large Vortices on Gas Turbine Trenched Film Cooling Flows Using Planar Temperature-Velocity Imaging
(The American Society of Mechanical Engineers (ASME), 2022)Film cooling is a critical gas turbine technology to reduce heat loads on the combustion chamber and the turbine vanes and blades. To improve film cooling performance, trenched cooling configurations where the holes are ... -
Detached Eddy Simulation of the Unsteady Flow and Film Cooling Characteristics of an Endwall With an Interrupted Slot
(The American Society of Mechanical Engineers (ASME), 2022)The flows close to a high-pressure turbine endwall are highly three-dimensional and unsteady. These flows increase the aerodynamic loss and augment the heat transfer. In this paper, the unsteady flows and film cooling ... -
The Effect of Inlet Conditions on Turbine Endwall Loss
(The American Society of Mechanical Engineers (ASME), 2022)There can be significant variation and uncertainty in the flow conditions entering a blade row. This article explores how this variability can affect endwall loss in axial turbines. A computational study of three cascades ...