Journal of Turbomachinery: Recent submissions
Now showing items 761-780 of 4519
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Sweep Effects on Fan–Intake Aerodynamics at High Angle of Attack
(The American Society of Mechanical Engineers (ASME), 2022)Sweep in a transonic fan is conventionally used to reduce design point losses by inclining the passage shock relative to the incoming flow. However, future low pressure ratio fans operate to lower Mach numbers meaning the ... -
Assessment of the Loss Map of a Centrifugal Compressor's External Volute
(The American Society of Mechanical Engineers (ASME), 2021)A volute's loss coefficient is highly sensitive to Mach number, circumferential velocity, and flowrate at volute inlet. In case of a backswept impeller, these parameters are coupled to each other. Therefore, in order to ... -
“I-Spots” and Emmons’ Spot Production Rate
(The American Society of Mechanical Engineers (ASME), 2021)A new intermittency function flagging the turbulent, becalmed, and non-becalmed regions of transitional flow is introduced. In addition, a method is developed to detect embedded incipient turbulent spots within the ... -
Experimental and Numerical Study of an Open Impeller Centrifugal Compressor Stage Utilizing Three-Dimensional (3D) Diffuser End Wall Contouring for Operating Range Extension
(The American Society of Mechanical Engineers (ASME), 2021)Highly efficient and concurrent flexible operation are heavy demands on today's centrifugal compressor units. Diffuser end wall contouring is a measure to delay the incipience of instability and therefore to extend the ... -
Adiabatic Effectiveness and Thermal Field Measurements of a Shaped Hole in the Showerhead of a Model Turbine Blade
(The American Society of Mechanical Engineers (ASME), 2021)Few published studies incorporating shaped hole designs in the leading-edge region, or showerhead, of turbine airfoils have been performed; but among them is the indication that shaped holes may offer an improvement in ... -
Influence of Boundary Layer Skew on the Tip Leakage Vortex of an Axial Compressor Stator
(The American Society of Mechanical Engineers (ASME), 2021)For an axial compressor stator with tip gap, the boundary layer (BL) in the hub endwall region has a significant influence on the development and progression of the tip leakage vortex. Herein, the so-called BL skew, which ... -
Heat Transfer and Pressure Loss in a Two-Pass, Rectangular Channel Featuring a Reduced Cross-Sectional Area After the 180-Deg Tip Turn With Different Turning Vane Configurations
(The American Society of Mechanical Engineers (ASME), 2021)Serpentine, multi-pass cooling passages are used in cooling advanced gas turbine blades. In the open literature, most internal cooling studies use a fixed cross-sectional area for multi-pass channels. Studies that use ... -
Acoustic Resonance in an Axial Multistage Compressor Leading to Non-Synchronous Blade Vibration
(The American Society of Mechanical Engineers (ASME), 2021)Significant non-synchronous blade vibrations (NSVs) have been observed in an experimental three-stage high-speed compressor at part-speed conditions. High-amplitude acoustic modes, propagating around the circumference and ... -
Effect of Tip Clearance on Rotating Stall in a Mixed-Flow Pump
(The American Society of Mechanical Engineers (ASME), 2021)The non-uniform disturbance in the circumferential direction is the essential cause of the occurrence of rotating stall in a turbomachinery. In order to study the effect of tip clearance leakage flow on rotating stall, the ... -
Detailed Experimental Study of the Flow in a Turbine Rear Structure at Engine-Realistic Flow Conditions
(The American Society of Mechanical Engineers (ASME), 2021)A good aerodynamic design of the turbine rear structure (TRS) is crucial for improving efficiency and reducing emissions from aero-engines. This paper presents a detailed experimental evaluation of an engine-realistic TRS ... -
Computational and Experimental Study of the Unsteady Convection of Entropy Waves Within a High-Pressure Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2021)This article describes the transport and the interaction of pulsating entropy waves generated by combustor burners within a high-pressure turbine stage for aeronautical application. Experiments and computational fluid ... -
Effect of Axial Casing Groove Geometry on Rotor-Groove Interactions in the Tip Region of a Compressor
(The American Society of Mechanical Engineers (ASME), 2021)This experimental study characterizes the interactions of axial casing grooves (ACGs) with the flow in the tip region of an axial turbomachine. The tests involve grooves with the same inlet overlapping with the rotor blade ... -
Effects of Axial Casing Grooves on the Structure of Turbulence in the Tip Region of an Axial Turbomachine Rotor
(The American Society of Mechanical Engineers (ASME), 2021)Challenges in turbulence modeling in the tip region of turbomachines include anisotropy, inhomogeneity, and non-equilibrium conditions, resulting in poor correlations between Reynolds stresses and the corresponding mean ... -
A Robust Implementation of a Reynolds Stress Model for Turbomachinery Applications in a Coupled Solver Environment
(The American Society of Mechanical Engineers (ASME), 2021)In the industrial simulation of flow phenomena, turbulence modeling is of prime importance. Due to their low computational cost, Reynolds-averaged methods (RANS) are predominantly used for this purpose. However, eddy ... -
Comparison of Endwall Loss Reduction Techniques in a High-Lift Turbine Passage
(The American Society of Mechanical Engineers (ASME), 2021)The development of techniques that reduce the losses in the endwall region is an important area of research as it supports an increase in the turbine design space through the use of higher lift blade designs while maintaining ... -
Unsteady Steam Turbine Optimization Using High-Fidelity Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2021)This paper presents the computational methodology and experimental investigations accomplished to enhance the efficiency of a turbine stage by applying non-axisymmetric profiling on the rotor hub wall. The experimental ... -
Effects of Turning Angle and Turning Internal Radius on Channel Impingement Cooling for a Novel Internal Cooling Structure
(The American Society of Mechanical Engineers (ASME), 2021)Leading-edge multi-channel double-wall design, a novel internal cooling structure, has been presented recently to enable higher overall cooling effectiveness with less penalty of coolant and pressure loss. Our previous ... -
An Experimental, Aerodynamic Evaluation of Design Choices for a Low-Pressure Compressor Transition Duct
(The American Society of Mechanical Engineers (ASME), 2021)The S-shaped duct which transfers flow from the low-pressure fan to the engine core in large civil turbofans presents a challenging problem. Aerodynamically it has a spatially and temporarily varying inlet flow combined ... -
Effect of Reynolds Number on Five-Hole Probe Performance: Experimental Study of the Open-Access Oxford Probe
(The American Society of Mechanical Engineers (ASME), 2021)There is relatively little literature concerning the effect of Reynolds number on multi-hole aerodynamic probe performance. In particular, there is almost no discussion in the literature regarding the underlying mechanisms ... -
High-Fidelity Simulations of a High-Pressure Turbine Vane Subject to Large Disturbances: Effect of Exit Mach Number on Losses
(The American Society of Mechanical Engineers (ASME), 2021)We report on a series of highly resolved large-eddy simulations of the LS89 high-pressure turbine (HPT) vane, varying the exit Mach number between Ma = 0.7 and 1.1. In order to accurately resolve the blade boundary layers ...