Reducing Secondary Flow Losses in Low-Pressure Turbines With Blade Fences. Part II: Experimental Validation on Linear Cascades

TitleReducing Secondary Flow Losses in Low-Pressure Turbines With Blade Fences. Part II: Experimental Validation on Linear Cascades
Publication TypeConference Paper
Year of Publication2019
AuthorsGiovannini M, Rubechini F, Amato G, Arnone A, Simoni D, Yepmo V, Satta F, Bertini F
Conference NameASME Turbo Expo 2019
VolumeVolume 2B: Turbomachinery
PaginationV02BT40A021
Date Published11/2019
PublisherASME
Conference LocationPhoenix, Arizona, USA, June 17-21, 2019
ISBN Number978-0-7918-5856-1
Other NumbersScopus 2-s2.0-85075575859
KeywordsAerodynamics, Computational Fluid Dynamics (CFD), Turbines
Abstract

This paper deals with the design of passive control devices for reducing the impact of secondary flows on the aerodynamics of low-pressure turbine (LPT) stages. A novel kind of device is introduced which consists of shelf-like fences to be added to the blade surface. Such a device is intended to harm the development of secondary flows, thus reducing losses and flow turning devi-ation with respect to the naked blade. In this second part, an experimental campaign on a linear cascade is presented which is aimed at proving the beneficial im-pact of the blade fences. Experiments were carried out on a low-speed test-rig, equipped with a large scale blade representative of the stators of the engine-like environment considered in part I. Measurements are mainly focused on the stator losses and on the flow field at the stator exit. The performance of the blade fences were evaluated by comparing the naked cascade and the fenced ones. The measurements highlighted the impact of the blade fences on the development of the secondary flows, affect-ing both the stator losses and the non-uniformity of the flow field over the exit plane, which, in the actual stage environment, im-pacts the operation of the downstream blade row. Moreover, the comparison between CFD and experiments proved the accuracy of the CFD setup, thus suggesting its reliability in predicting the stage performance in the engine-like configuration.

Notes

ASME paper GT2019-91284

URLhttps://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2019/58561/V02BT40A021/1066499
DOI10.1115/GT2019-91284
Refereed DesignationRefereed