Recent Insights into the Flow Topology Around Highly Loaded Tandem Vanes

Heinrich, Alexander; Peitsch, Dieter

doi:10.33737/gpps19-bj-225

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…They proved a good performance for the tandem stator at varying flow conditions. Heinrich et al (2015), Tiedemann et al (2017), Heinrich et al (2017) as well as Heinrich and Peitsch (2019) investigated the flow topology of tandem blades at a cascade with respect to secondary flow structures. They showed that the gap flow has a strong influence on the boundary layer of the rear blade, resulting in different corner vortex formation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Transonic Compressor with Variable Stator Vanes in Tandem Arrangement

Foret¹,

Franke²,

Schiffer³

et al. 2020

Proceedings of Global Power &Amp; Propulsion Society

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This paper investigates the effects of a 1.5-stage transonic axial compressor with a variable tandem stator arrangement. The experiments were carried out at the transonic research compressor rig at Technical University of Darmstadt. The test rig represents a front stage highpressure compressor of jet engines. Using extensive instrumentation, the global performance is analyzed. A new designed compressor stage has been commissioned, including a BLISK rotor and tandem stator vanes with variable stagger angles. In comparison with a reference stage using a conventional stator design, the new stator design enables a higher aerodynamic stator vane loading. Therefore an optimized stage loading is pursued, leading to an increased work coefficient whilst retaining the operating range of the stage. The experimental study reveals several effects of the optimized compressor stage, considering both, performance and corresponding aerodynamics. The operating range with varying VIGV-VSV schedules differs to the reference case. At nominal tandem stator vane closure, stage pressure rise is increased for the whole operating range. Comparing the stage exit aerodynamics of the tandem and reference stator at design speed, distinct differences appear. In conclusion, the conducted experimental investigations prove potential capabilities of transonic compressors, enabling optimized stage loading.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Transonic Compressor with Variable Stator Vanes in Tandem Arrangement

Foret¹,

Franke²,

Schiffer³

et al. 2020

Proceedings of Global Power &Amp; Propulsion Society

View full text Add to dashboard Cite

show abstract

An Analysis of the Secondary Flow Around a Tandem Blade Under the Presence of a Tip Gap in a High-Speed Linear Compressor Cascade

Konrath

Peitsch

Heinrich

2022

Journal of Turbomachinery

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Tandem blades have often been under investigation, experimentally as well as numerically, but most studies have been about tandem blade stators without tip gap. This work analyzes the influence of a tip gap on the flow field of a tandem blade for engine core compressors. Experiments have been conducted in a high-speed linear compressor cascade on a tandem and a reference geometry. The flow is analyzed using five-hole probe measurements in the wake of the blades and oil flow visualization to show the near surface stream lines. First, the results for design conditions (tandem and conventional blade) are compared to measurements on corresponding blades without tip gap. Similarities and differences in the flow topology due to the tip clearance are analyzed, showing that the introduction of the tip clearance has a similar influence on the loss and turning development for the tandem and the conventional blade. The tandem blade features two tip clearance vortices with a complex flow interaction and the possible formation of a third counter-rotating vortex between them. An incidence variation from 0deg to 5deg for both blades indicates at first a similar behavior. After a separation of the flow field into gap and non-gap half it becomes apparent that the tandem blade shows higher losses on the gap side, while featuring a close-to-constant behavior on the non-gap side. Further investigation of the flow on the gap side shows indicators of the front blade exhibiting tip clearance vortex break down.

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Recent Insights into the Flow Topology Around Highly Loaded Tandem Vanes

Cited by 2 publications

References 12 publications

Experimental Investigation of a Transonic Compressor with Variable Stator Vanes in Tandem Arrangement

Experimental Investigation of a Transonic Compressor with Variable Stator Vanes in Tandem Arrangement

An Analysis of the Secondary Flow Around a Tandem Blade Under the Presence of a Tip Gap in a High-Speed Linear Compressor Cascade

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