Journal of Turbomachinery: Recent submissions
Now showing items 381-400 of 4519
-
Design of Aerodynamically Balanced Transonic Compressor Rotors
(The American Society of Mechanical Engineers (ASME), 2023)This paper describes a simple and efficient physics-based method for designing optimal transonic multistage compressor rotors. The key to this novel method is that the spanwise variation of the parameter which controls the ... -
A Numerical Test Rig for Turbomachinery Flows Based on Large Eddy Simulations With a High-Order Discontinuous Galerkin Scheme—Part I: Sliding Interfaces and Unsteady Row Interactions
(The American Society of Mechanical Engineers (ASME), 2023)In this first paper of a three-part series, we present the extension and validation of the high-order discontinuous Galerkin scheme in DLR’s CFD-solver trace for scale-resolving simulations of unsteady row interactions. ... -
On the Development of High-Lift, High-Work Low-Pressure Turbines
(The American Society of Mechanical Engineers (ASME), 2024)Here, we describe a combined design, numerical, and experimental program intended substantially to increase the lift and work of low-pressure turbine stages. This exercise is critically dependent upon the appropriate ... -
Experimental Investigations on Aeroelastic Stability of Combined Plunge-Pitch Mode Shapes in a Linear Compressor Cascade
(The American Society of Mechanical Engineers (ASME), 2024)The effect of mode shape and reduced frequency on the flutter stability of a linear low-speed compressor cascade was investigated experimentally, employing the aerodynamic influence coefficient (AIC) approach. This paper ... -
Vortex Lattice Method Investigation of Tip-Leakage Flow
(The American Society of Mechanical Engineers (ASME), 2024)The use of a vortex lattice method (VLM) is investigated on a tip-leakage flow single-blade configuration (NACA 0012) for a wide range of tip gaps. The aim is to estimate the circulation of the tip-leakage vortex (TLV) ... -
A Superposition Technique for Predicting Overall Effectiveness With Multiple Sources of Individually Characterized Internal and External Coolant Flows
(The American Society of Mechanical Engineers (ASME), 2024)High-performance gas turbine engines rely on intricate cooling schemes to protect turbine components from the high-temperature freestream gas. Determining the optimal placement of film cooling holes in optimal locations ... -
Aerodynamic Impact of Secondary Air Injection Flowrates on the Main Annulus Flow Field for a Transonic High-Pressure Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2024)In this study, the influence of secondary air blowing on the main annulus flow field of a transonic high-pressure turbine (HPT) was investigated experimentally and numerically. The experimental setup was a single-stage, ... -
Large Eddy Simulation of Laminar and Turbulent Shock/Boundary Layer Interactions in a Transonic Passage
(The American Society of Mechanical Engineers (ASME), 2024)Shock/boundary layer interactions (SBLI) are a fundamental fluid mechanics problem relevant in a wide range of applications including transonic rotors in turbomachinery. This paper uses wall-resolved large eddy simulation ... -
Investigation on the Flow and Heat Transfer Characteristics in a Multi-Pass Channel Using Magnetic Resonance Velocimetry and Transient Thermochromic Liquid Crystal
(The American Society of Mechanical Engineers (ASME), 2024)The three-dimensional flow field in multi-pass channels with and without ribs was measured by magnetic resonance velocimetry (MRV), while heat transfer performance on the endwall of channels in the same geometry was ... -
Enhancing Aerodynamic Performance of a Non-Axisymmetric Endwall Contoured Cascade Through Section Profiling Method
(The American Society of Mechanical Engineers (ASME), 2024)Endwall contouring and 3D blade configurations are effective techniques for enhancing turbomachinery performance. The integration of these technologies is an important area of investigation. To continue the numerical and ... -
Pragmatic Prediction Model of Droplet Trajectory in a Turbine Cascade
(The American Society of Mechanical Engineers (ASME), 2024)Droplet deposition on a turbine cascade is important for the turbine system performance but its experimental analysis is difficult. Thus, the simulation of a droplet liquid phase in a gas flow field was studied to optimize ... -
Considerations for Compressible Film Cooling: A Computational Study of the Effects of Transonic Flows and Varying Mainstream Mach Number
(The American Society of Mechanical Engineers (ASME), 2024)Recent evidence suggests that film cooling flows with engine-realistic mainstream Mach number have declined performance in comparison to those with conventional low-speed laboratory conditions. Consideration and understanding ... -
Design Optimization of a Novel Flush Boundary Layer Diverter
(The American Society of Mechanical Engineers (ASME), 2024)A novel boundary layer diverter is designed and optimized for increasing the performance of a typical semi-submerged inlet ingesting large amounts of boundary layer flow. A conceptual diverter configuration based on the ... -
Aerothermal Performance Robustness and Reliability Analysis of Turbine Blade Squealer Tip With Film Cooling
(The American Society of Mechanical Engineers (ASME), 2024)The uncertainty quantification in the turbine components' aerodynamic and heat transfer performances is widely considered to be the most challenging topic due to its intricate and nonlinear characteristics. This paper first ... -
Evaluation of Adjoint-Optimized Holes—Part I Baseline Performance
(The American Society of Mechanical Engineers (ASME), 2024)With the advent of the use of additive manufacturing to build gas turbine components, the design space for new hole geometries is essentially unlimited. Recently, a computational adjoint-based optimization method was used ... -
Film Cooling Performances Under Various Upstream Roughness Conditions: Experimental Investigations and Similarity Hypothesis
(The American Society of Mechanical Engineers (ASME), 2024)Roughness caused by deposition, erosion, and additive manufacturing can significantly affect gas turbine efficiency. Previous research has often examined film cooling performance under limited roughness configurations, ... -
Stall Warning and Adaptive Control Subjected to Rotating Inlet Distortion in Axial Flow Compressor
(The American Society of Mechanical Engineers (ASME), 2024)Adaptive stability control is experimentally implemented in a single-stage axial flow compressor subjected to rotating inlet distortion. Stall margin variations are examined as a function of the distorted area and rotational ... -
Investigation of an Inter-Compressor S-Duct Using the Lattice Boltzmann Method
(The American Society of Mechanical Engineers (ASME), 2024)This article presents the study of a subsonic inter-compressor S-duct. Numerical simulations are performed using large-eddy simulation (LES) based on a compressible hybrid thermal lattice Boltzmann method (LBM) implemented ... -
A New Perspective on Internal Turbine Blade Cooling by Perforated Blockages and Pin-Fins
(The American Society of Mechanical Engineers (ASME), 2024)The cooling configuration, sequentially combining perforated blockages (forming blockage jets) and a pin-fin array inside the trailing-edge of a turbine blade has been perceived unsuitable due to the presumed inferior ... -
Impact of Low Freestream Turbulence and Surface Roughness on the Flat-Plate Boundary Layer Transition Under a High-Lift Airfoil Pressure Gradient
(The American Society of Mechanical Engineers (ASME), 2024)Effects of low incoming freestream turbulence level (Tu < 1%) and surface roughness on the transition of flat-plate boundary layers under a high-lift airfoil pressure gradient have been investigated. Time-resolved ...