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Investigation of tip clearance flow effects on an open 3D steam turbine flutter test case
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2017 (English)In: Proceedings of the ASME Turbo Expo, American Society of Mechanical Engineers (ASME) , 2017Conference paper, Published paper (Refereed)
Abstract [en]

Blade failure caused by flutter is a major problem in the last stage of modern steam turbines. It is because rotor at this stage always has a large scale in spanwise, which provides low structural frequency as well as supersonic tip speeds. Since most of the unsteady aerodynamic work is done in the tip region, transonic tip-leakage flow that influences the tip region flow could have a remarkable effect on the aerodynamic stability of rotor blades. However, few research had been done on the tipleakage flow influence on flutter characteristic based on fullscale steam turbine numerical models. In this paper, an open 3D steam turbine stage model designed by Durham University was applied, which was widely analyzed and representative for the last stage of modern industrial steam turbines. The average Mach number at the rotor outlet is 1.1. URANS simulation carried by both numerical software CFX and LUFT code is applied, and the two solvers show an agreement on steady and unsteady results. The numerical results indicate that the influence of tip leakage flow on blade stability is based on two types of flow mechanisms. Both mechanisms act on the suction side of near tip region. The first type of mechanism is produced by the reduction of passage shock near the leading edge, and the other type of mechanism at the rear of blade is caused by the interaction between tip leakage vortex and trailing edge shock of the neighbor blade. In conclusion, tip leakage flow has a significant influence on steam turbine flutter boundary prediction and requires further analysis in the future.

Place, publisher, year, edition, pages
American Society of Mechanical Engineers (ASME) , 2017.
Keyword [en]
Aerodynamic stability, Flutter, Steam turbine, Tip clearance, Aerodynamics, Computer software, Flutter (aerodynamics), Gas turbines, Leakage (fluid), Steam, Turbines, Turbomachine blades, Turbomachinery, Unsteady flow, Flutter boundary predictions, Numerical results, Numerical software, Structural frequencies, Tip clearance flow, Tip leakage vortex, Unsteady aerodynamics, Steam turbines
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216582DOI: 10.1115/GT2017-64021ISI: 000412862600056Scopus ID: 2-s2.0-85028966551ISBN: 9780791850954 OAI: oai:DiVA.org:kth-216582DiVA, id: diva2:1154031
Conference
ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017, 26 June 2017 through 30 June 2017
Note

QC 20171101

Available from: 2017-11-01 Created: 2017-11-01 Last updated: 2017-11-01Bibliographically approved

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Petrie-Repar, Paul

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