Journal of Turbomachinery: Recent submissions
Now showing items 581-600 of 4519
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Evolution of Turbulence and Its Modification by Axial Casing Grooves in a Multi-Stage Axial Compressor
(The American Society of Mechanical Engineers (ASME), 2022)This experimental study examines the evolution of turbulence across an axial compressor and its modification by semicircular axial casing grooves (ACGs) at the pre-stall and near the best efficiency (BEP) flowrates. The ... -
Characterizing Flow Instabilities During Transient Events in the Turbine Rim Seal Cavity
(The American Society of Mechanical Engineers (ASME), 2022)Gas turbine engine design requires considerations not only for long-term steady operation but also for critical transient events. Aircraft engines undergo significant stress during takeoff and landing, while power generation ... -
Unsteady Gas Dynamics of Radial Turbine Volutes Under Pressure Pulsations
(The American Society of Mechanical Engineers (ASME), 2022)Turbocharging is the key technique to improve engine-specific power and reduce CO2 emissions of a piston-driven engine. Repeated actions of engine pistons and valves give rise to engine pulsations resulting in intensive ... -
Characterization of an Apparatus to Study Solid Deposit Formation in Lubricating Oils at High Temperatures
(The American Society of Mechanical Engineers (ASME), 2022)When exposed to excessively high temperatures, the lubricating oils in turbines undergo extreme oxidation and thermal degradation processes that eventually result in the formation of solid deposits that can, in turn, cause ... -
Amplitude and Wavelength Effects for Wavy Channels
(The American Society of Mechanical Engineers (ASME), 2022)To improve the efficiency and durability of gas turbine components, advancements are needed in cooling technologies. To accomplish this task, some manufacturers are turning to additive manufacturing (AM), as it offers the ... -
Assessment of the Flow Field and Heat Transfer in a Vane Cooling System Using Magnetic Resonance Velocimetry, Thermochromic Liquid Crystals, and Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2022)Computational fluid dynamics (CFD) is the standard tool in the turbomachinery industry to analyze and optimize internal cooling systems of turbine components, but the code applied has to be validated. This paper presents ... -
Numerical Prediction of Long-Term Droplet Erosion and Washing Efficiency of Axial Compressors Through the Use of a Discrete Mesh Morphing Approach
(The American Society of Mechanical Engineers (ASME), 2022)Online water washing represents an operation strategy commonly used to reduce compressor performance deterioration due to blade fouling. Since this kind of washing is applied when the machine operates close to full load ... -
Mitigation of Boundary Layer Ingestion Circumferential Distortion Using Nonaxisymmetric Fan Exit Guide Vanes
(The American Society of Mechanical Engineers (ASME), 2022)This paper presents an assessment of the effect of nonaxisymmetric fan exit guide vanes (FEGVs) to mitigate, or even reduce to zero, the impact of circumferential flow distortion—such as created by boundary layer ingestion ... -
Attributes of Bi-Directional Turbomachinery for Pumped Thermal Energy Storage
(The American Society of Mechanical Engineers (ASME), 2022)In this paper, we (i) present a methodology for determining the aerodynamic performance of bi-directional turbomachines for pumped thermal energy storage, i.e., turbomachines designed to operate as a compressor in one ... -
Low Reynolds Number Effects on the Endwall Flow Field in a High-Lift Turbine Passage
(The American Society of Mechanical Engineers (ASME), 2022)Understanding the endwall flow phenomena surrounding low-pressure turbine blades is key to improving performance, as these flow features contribute significantly to loss generation at low Reynolds number cruise. It is well ... -
Modeling of Dynamic Response of a Radial Turbine to Pulsatile Incoming Flow
(The American Society of Mechanical Engineers (ASME), 2022)The unsteady response of a turbine exposed to pulsatile incoming flow is studied via the analytical model in this article. First, the response of output torque of the turbine to pulsatile condition is theoretically studied ... -
The Effects of Swirling Flows in Entropy Wave Convection Through High-Pressure Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2022)First stages of aeronautical high-pressure turbines are subjected to significant inlet distortions generated by the combustor system. These disturbances are characterized by velocity and temperature fluctuations convected ... -
Scaling Flat Plate Overall Effectiveness Measurements
(The American Society of Mechanical Engineers (ASME), 2022)Low temperature experiments are often performed on models of cooled turbine components in order to predict the temperature of the actual turbine component at engine conditions. Designing the scaled experiment properly takes ... -
Performance Investigation of Airfoils for Axial Flow Fans in Low Solidity Cascades Operating at High Inlet Flow Angles
(The American Society of Mechanical Engineers (ASME), 2022)Axial flow fans are usually characterized by blade sections with low solidity and high inlet flow angles. Two main approaches are followed in the preliminary design phase, to take into account blade interaction effects: ... -
Comparing Gradient-Free and Gradient-Based Multi-Objective Optimization Methodologies on the VKI-LS89 Turbine Vane Test Case
(The American Society of Mechanical Engineers (ASME), 2022)The present paper addresses the multi-objective aerodynamic shape optimization of the two-dimensional LS-89 turbine cascade. The objective is to minimize the entropy generation at subsonic and transonic flow conditions ... -
Experimental Study of Impact of In-Service Deterioration on Thermal Performance of High-Pressure Nozzle Guide Vanes
(The American Society of Mechanical Engineers (ASME), 2022)In this paper, we analyze the impact of in-service deterioration on the overall thermal performance (metal effectiveness) of heavily cooled high-pressure nozzle guide vanes of a design typical of large civil jet engines. ... -
PDA Laser Measurements of Droplet-Laden Flows in a Four-Stage Axial Compressor
(The American Society of Mechanical Engineers (ASME), 2022)Droplet-laden flows play a significant role in the development of turbomachinery. For example, fine water droplets are injected into the flow path of axial compressors to increase the power output of gas turbines by making ... -
The Effect of Reaction on Compressor Performance
(The American Society of Mechanical Engineers (ASME), 2022)Reaction is the fundamental parameter by which the asymmetry of the velocity triangle of a stage is set. Little is understood about the effect that a reaction has on either the efficiency or the operating range of a ... -
Instabilities Everywhere! Hard Problems in Aero-Engines
(The American Society of Mechanical Engineers (ASME), 2022)Many of the challenges that limited aero-engine operation in the 1950s, 1960s, 1970s, and 1980s were static in nature: hot components exceeding temperature margins, stresses in the high-speed rotating structure approaching ... -
Application of Adjoint-Enhanced First Order Second Moment Method for Robust Design Optimization of a High Pressure Compressor Rotor
(The American Society of Mechanical Engineers (ASME), 2022)This paper applies the computationally advantageous combination of a differential analysis technique and the adjoint method in the context of uncertainty quantification to the gradient-based robust design optimization of ...