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RISHigh-Fidelity Simulations of a High-Pressure Turbine Vane Subject to Large Disturbances: Effect of Exit Mach Number on Losses
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: 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 ...
Large-Eddy Simulations of High Rossby Number Flow in the High-Pressure Compressor Inter-Disk Cavity
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The focus of the present study is to understand the effect of Rayleigh number on a high Rossby number flow in a high-pressure compressor inter-disk cavity. These cavities form between the compressor disks of a gas turbine ...
Using a New Entropy Loss Analysis to Assess the Accuracy of RANS Predictions of an High-Pressure Turbine Vane
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Entropy loss is widely used to quantify the efficiency of components in turbomachines, and empirical relations have been developed to estimate the contribution of different mechanisms. However, further analysis is still ...
High-Fidelity Simulations of Multi-Jet Impingement Cooling Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This article shows the first parametric study on turbulent multi-jet impingement cooling flows using large-eddy simulations (LES). We focus on assessing the influence of the inter-jet distance and the cross-flow conditions ...
High-Fidelity Simulation Study of the Unsteady Flow Effects on High-Pressure Turbine Blade Performance
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Unsteadiness, in the form of both broadband background disturbances and discrete coherent wakes, can have a strong effect on the performance of turbomachinery blades. The influence of the incoming flow has received much ...
Profile Loss Reduction of High-Lift Turbine Blades With Rough and Ribbed Surfaces
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Transitional boundary layers on low-pressure turbines (LPTs) are prone to separation on the suction surface of the blade under strong local adverse pressure gradients. Intermittent freestream turbulence, periodic wakes ...
Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part I: Methodology and Challenges
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: High-fidelity simulation of transitional and turbulent flows over multi-scale surface roughness presents several challenges. For instance, the complex and irregular geometrical nature of surface roughness makes it impractical ...
Improving a Two-Equation Eddy-Viscosity Turbulence Model for High-Rayleigh-Number Natural-Convection Flows Using Machine Learning
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This study presents data-driven modeling of the Reynolds stress tensor and turbulent heat flux vector for improving unsteady Reynolds-averaged Navier–Stokes (RANS) predictions of natural convection problems. While RANS-based ...
Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied Via High-Fidelity Simulation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: High-fidelity simulations are used to conduct controlled numerical experiments to investigate the effect of periodically incoming wakes on profile and three-dimensional loss mechanisms. The present work considers the ...
Compressible Direct Numerical Simulation of Low Pressure Turbines—Part II: Effect of Inflow Disturbances
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In the present paper, direct numerical simulation (DNS) studies of the compressible flow in the T106 linear cascade have been carried out. Various environmental variables, i.e., background turbulence level, frequency of ...