Journal of Turbomachinery: Recent submissions
Now showing items 161-180 of 4312
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Compressor Tip Leakage Mechanisms
(The American Society of Mechanical Engineers (ASME), 2024)The over tip leakage flow in an unshrouded compressor blade row is highly three dimensional, yet in order for aerodynamicists to analyze and improve designs, they must be able to simplify the problem down to a limited ... -
Heat Transfer Coefficient and Adiabatic Effectiveness Measurements on a Nozzle Guide Vane With a Single Row of Cylindrical Holes
(The American Society of Mechanical Engineers (ASME), 2024)Film-cooling injection significantly affects the thermal behavior of turbine vane surfaces. In addition to the beneficial effect of the film shielding the vane from the hot gas flow, alteration of the thermal boundary layer ... -
Roughness Related to Cooling Performance of Channels Made Through Additive Manufacturing
(The American Society of Mechanical Engineers (ASME), 2024)The complex surface morphology and multiscale surface features inherent in additively manufactured (AM) components contribute to the overall flow characteristics and heat transfer of cooling passages. As the AM process and ... -
Loss Analysis in Radial Inflow Turbines for Supercritical CO2 Mixtures
(The American Society of Mechanical Engineers (ASME), 2024)Recent studies suggest that CO2 mixtures can reduce the costs of concentrated solar power plants. Radial inflow turbines (RIT) are considered suitable for small to medium-sized CO2 power plants (100 kW to 10 MW) due to ... -
Swirl Enhancement Effect on Turbine Rim Seal Performance
(The American Society of Mechanical Engineers (ASME), 2023)In gas turbines, sealing flow is extracted from the high-pressure compressor and supplied into the turbine wheel-space to suppress hot gas ingestion. Such hot gas ingestion is thought to be driven by the difference in ... -
A Novel Multi-Fidelity Surrogate for Efficient Turbine Design Optimization
(The American Society of Mechanical Engineers (ASME), 2023)To solve the turbine design optimization problems efficiently, surrogate-based optimization algorithms are frequently used. To further reduce the cost of turbine design, the multi-fidelity surrogate (MFS)-based optimization ... -
A Probabilistic Approach to Turbine Uncertainty
(The American Society of Mechanical Engineers (ASME), 2023)Efficiency is an essential metric for assessing turbine performance. Modern turbines rely heavily on numerical computational fluid dynamics (CFD) tools for design improvement. With more compact turbines leading to lower ... -
A Data-Centric Approach to Loss Mechanisms
(The American Society of Mechanical Engineers (ASME), 2023)Breaking down the total loss in a turbomachine into a number of low-order, physical models is a powerful way of developing loss models for informing design decisions. Better loss models lead to better design decisions. A ... -
Optimization of Three-Dimensional Blade and Variable Stators for Efficiency and Stability Enhancement of Multistage Axial Flow Compressor at Variable Speeds
(The American Society of Mechanical Engineers (ASME), 2023)High efficiency and wide stability at variable speeds are equally important to the design and operation of multistage axial flow compressors. However, published research works on three-dimensional design optimization of ... -
Analysis of Single-Blade Passage and Full Circumference Large-Eddy Simulations of Turbine Rim Seal Flows
(The American Society of Mechanical Engineers (ASME), 2023)The flow in a 1.5-stage axial flow turbine with 16 vanes and 32 blades is investigated by large-eddy simulations with special focus on the analysis of the hot gas ingress through the rim seal into the upstream wheel space. ... -
Particle Image Velocimetry Measurements in a High-Speed Low-Reynolds Low-Pressure Turbine Cascade
(The American Society of Mechanical Engineers (ASME), 2023)Particle image velocimetry (PIV) measurements in the blade-to-blade (B2B) plane and cascade outlet plane (COP) of a high-speed low-pressure turbine (LPT) cascade were performed at engine-representative outlet Mach number ... -
A Novel Axial Energy-Imparting Turbomachine for High-Enthalpy Gas Heating: Robustness of the Aerodynamic Design
(The American Society of Mechanical Engineers (ASME), 2023)Hard-to-abate industrial processes, such as petrochemicals and cement production, have long been considered technically challenging to decarbonize. In response to the urgent demand to eliminate industrial CO2 emissions, a ... -
Exploring Physics of Acoustic Flow Control Over Airfoils Toward Potential Application to High Work and Lift Turbines
(The American Society of Mechanical Engineers (ASME), 2023)In this study, acoustic actuation was applied experimentally to massively separated flows on simplified hump geometries, which mimic the pressure distribution over high-work-and-lift low Reynolds airfoils. The acoustic ... -
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, ...