Please use this identifier to cite or link to this item:
Title: Performance of slotted end wall linear cascade tunnels at off-design conditions
Authors: Rona, Aldo
Gostelow, J. Paul
First Published: 2005
Citation: Proceedings of the 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, USA, 10-13 January, 2005, pp. 1-12
Abstract: Linear cascade transonic wind tunnels with an open jet test section can suffer from pitchwise end-wall interference. This causes a loss of pitchwise periodicity in the cascade, increasing the uncertainty in the measurements and producing less accurate estimates of turbine stage performance, flow exit angle and loss coefficient. To reduce the end-wall interference, a slotted tailboard is tested in a transonic cascade run off-design, in a regime at which the profile trailing edge shocks produce substantial reflections in the absence of a suitable end-wall treatment. The tailboard is optimised by numerical modelling for an isentropic discharge Mach number of 1.27. Tests over the wider isentropic Mach number range 1:20 ≤ Mi ≤ 1:32 quantify the restored periodicity gained by the use of this tailboard. When the tailboard is used away from its design point of Mi = 1:27, the discharge remains more periodic than with an open jet test section. The tailboard performance varies nonmonotonically away from its design point, driven by complex changes in the discharge wave pattern. Some of these changes are identified by schlieren flow visualisation.
Type: Conference paper
Description: This paper was published as Proceedings of the 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, USA, 10-13 January, 2005, pp. 1-12. It is also available from
Appears in Collections:Conference Papers & Presentations, Dept. of Engineering

Files in This Item:
File Description SizeFormat 
Performance_of_Slotted_End....pdf515.02 kBAdobe PDFView/Open

Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.