Unsteady loss in a high pressure turbine stage
Journal
International Journal of Heat and Fluid Flow
Journal Volume
24
Journal Issue
5
Pages
698-708
Date Issued
2003
Author(s)
Abstract
An investigation into the unsteady losses in a high pressure turbine stage has been performed experimentally at engine-representative conditions. This has been done by making time-resolved measurements of entropy at stage exit at all vane and rotor-relative positions over a wide range of radial height. Due to the considerable difficulty of obtaining accurate measurements at engine-representative conditions, these measurements provide a unique set of experimental data. Five distinct flow features have been identified and their effects on the stage efficiency estimated, showing good overall agreement with an independent efficiency measurement. Comparisons with a particular numerical prediction of the flow field, Unstrest, have shown very good agreement in both the flow structure and the entropy generation. Only the rotor dependence of the loss mechanisms is examined here: the vane dependence will be presented in a subsequent paper. ? 2003 Elsevier Inc. All rights reserved.
Subjects
Entropy
High pressure effects
Numerical methods
Rotors
High pressure turbines
Turbines
fan
Heat transfer
high pressure
turbine
Turbulence
Unsteady flow
Type
journal article