Journal of Turbomachinery: Recent submissions
Now showing items 361-380 of 4519
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UHBR Open-Test Case Fan ECL5/CATANA: Non-Linear Analysis of Non-Synchronous Blade Vibration at Part-Speed Conditions
(The American Society of Mechanical Engineers (ASME), 2024)The onset of non-synchronous vibrations has been predicted for a composite open-test-case UHBR fan geometry by time-linearized simulations at part-speed conditions. In the current study, time-accurate simulations with ... -
Numerical Investigation of Classic Flutter Mechanism Under Circumferentially Non-Uniform Inlet Condition
(The American Society of Mechanical Engineers (ASME), 2024)Over recent years, the aeroelastic problem of fan blades has become significantly serious due to the demand for high performance of aero-engines. To explore the aeroelastic issue of flutter, fan instability is represented ... -
Mid-Span Stall Inception in Low-Pressure-Ratio Transonic Fans
(The American Society of Mechanical Engineers (ASME), 2024)In this paper, steady and unsteady computational fluid dynamics (CFD) have been used to investigate stall inception for a modern low-pressure-ratio transonic fan. The computational results are validated against measurement ... -
Investigating the Suitability of Multi-Scroll Volutes for Improving Spanwise Incidence of Mixed Flow Turbine Rotors With Varying Blade Cone Angles in Automotive Turbocharging Applications
(The American Society of Mechanical Engineers (ASME), 2024)Targets to reduce fuel consumption and reduce CO2 emissions have been met using engine downsizing and turbocharging. In automotive applications, it is important that the turbocharger responds well to transient events and ... -
Modeling of Combustor Non-Uniformities Evolution Through a High-Pressure Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2024)In modern gas turbines, the reduction of pollutant emissions can be achieved by employing lean-burn combustors. At the combustion chamber outlet, the flow is non-uniform and characterized by a residual swirl superimposed ... -
A New Multi-Stage Turbine Stator Design for Improved Performance Retention
(The American Society of Mechanical Engineers (ASME), 2024)An experimental and computational investigation has been undertaken into the effects of deterioration of the first-stage rotor-shroud knife-edge seal clearance in a two-stage turbine that has engine-representative cavity ... -
Experimental Analysis of Additively Manufactured Latticework Coupons
(The American Society of Mechanical Engineers (ASME), 2024)The capabilities and the precision of additive manufacturing processes have been tremendously increased in the last years, and this trend is not expected to be close to an end. Researchers, in the gas turbine industry, are ... -
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 ...