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RISAssessment of Two- and Three-Scale k–ε Models for Rotating Cavity Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A three-scale k–ε turbulence model was recently developed for complex flows such as the rotor–rotor and rotor–stator cavities found in gas turbine engines. The three-scale model is a logical ...
Tooth Thickness Effect on the Performance of Gas Labyrinth Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A previously validated finite difference computer code was revised to allow the specification of upstream and downstream reservoir conditions as boundary conditions, whereas the domain extends ...
Computation of Cavity-by-Cavity Flow Development in Generic Labyrinth Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A recently developed version of a swirl-flow finite difference computer code was improved and employed in predicting the compressible flow of air through generic labyrinth seals. The cavity-by-cavity ...
Thermal Details in a Rotor–Stator Cavity at Engine Conditions With a Mainstream
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This investigation involves a numerical study of enclosed Rotor–Stator cavities of gas turbine engines. The complete elliptic form of the 2-D, axisymmetric Navier–Stokes equations for compressible ...
Simulation of Subsonic Flow Through a Generic Labyrinth Seal
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A new method for predicting the leakage through labyrinth seals has been developed and is shown to provide realistic results which agree with measurements. It utilizes a finite-difference computer ...
Streamwise Curvature Effect on the Incompressible Turbulent Mean Velocity Over Curved Surfaces
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A curvature law of the wall, which determines the mean velocity profile, is analytically derived for near-wall turbulent flows to include strong curved-channel wall curvature effects through a ...
Computed Effects of Rotor-Induced Swirl on Brush Seal Performance—Part 1: Leakage Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a numerical study of the effects of rotor induced swirl velocity on the performance of brush seals. Such effects have been studied experimentally by Ferguson (1988), but ...
Computed Effects of Rotor-Induced Swirl on Brush Seal Performance—Part 2: Bristle Force Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper analytically investigates the aerodynamic bristle force distributions in brush seals used in aircraft gas turbine engines. These forces are responsible for the onset of bristle tip ...
Clearance Effects on Corresponding Annular and Labyrinth Seal Flow Leakage Characteristics
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A previous Navier-Stokes finite difference computer code is extended in order to compute seal leakage directly from given upstream and downstream reservoir pressures. The numerical results are ...
Measurement and Visualization of Leakage Effects of Rounded Teeth Tips and Rub-Grooves on Stepped Labyrinths
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The effect of rounded labyrinth teeth tips and worn abradable lands has been found to give substantially increased leakage, which is well known to give reduced machine efficiency. Very little ...