An experimental study on partial admission in a two-stage axial air test turbine with numerical comparisons
2004 (English)In: Proceedings of the ASME Turbo Expo 2004, Vienna, 2004, Vol. 5 B, 1285-1297 p.Conference paper (Refereed)
This paper presents ongoing experimental aerodynamic and efficiency measurements on a cold flow two-stage axial air test turbine with low reaction steam turbine blades at different degrees of partial admission. The overall objectives of the work are to experimentally investigate and quantify the steady and unsteady aerodynamic losses induced by partial admission. The first results show that both the total-to-static turbine efficiency drops and that the efficiency peak appears at lower isentropic velocity ratios with lower degrees of admission. Detailed steady traverse measurements of the static wall pressures downstream of sector-ends show strong local variations. The pressure wake from the partial admission blockage moves almost axially through the turbine while the temperature wake is located in a tangential position that represents the position of a particle trace based on velocity triangles, in the direction of the rotor rotation. Comparisons with 2D compressible flow computations around the circumference demonstrate the importance of the radial flow component in these experiments.
Place, publisher, year, edition, pages
Vienna, 2004. Vol. 5 B, 1285-1297 p.
, 2004 ASME Turbo Expo
Computational complexity, Mathematical models, Numerical analysis, Pressure effects, Steam, Thermodynamics, Turbomachine blades, Air test turbines, Radial flow components, Rotor rotations, Tangential position, Turbines
IdentifiersURN: urn:nbn:se:kth:diva-53550ScopusID: 2-s2.0-10244255167OAI: oai:DiVA.org:kth-53550DiVA: diva2:470349
Sponsors: ASME, International Gas Turbine Institute. QC 201201092011-12-282011-12-282012-01-09Bibliographically approved