Darmstadt Rotor No. 2, III: Experimental Analysis of an Aft-Swept Axial Transonic Compressor Stage

Manfred Beversdorff,Jörg Bergner,Dietmar K. Hennecke,Stephan Kablitz,Richard Schodl

doi:10.1155/s1023621x0300037x

Abstract

At Darmstadt University of Technology (Darmstadt, Germany), the Department of Gas Turbines and Flight Propulsion operates a single-stage transonic compressor test stand. Its main purpose is to provide a database for the validation of computational fluid dynamics codes. In addition, it serves as a testbed for new materials and also for the development of new measurement techniques. After setting up the test rig with a baseline rotor (Rotor No. 1), a titanium bladed disk with conventional radially stacked blade sections, a new rotor (Rotor No. 2) was designed, with the addition of considerable amounts of aft sweep and backward lean. The new rotor's flow field and mechanical properties were investigated by using various measurement techniques, including a laser-2-focus setup.

Highlights

At Darmstadt University of Technology (Darmstadt, Germany), the Department of Gas Turbines and Flight Propulsion operates a single-stage transonic compressor test stand
The new rotor’s flow field and mechanical properties were investigated by using various measurement techniques, including a laser-2-focus setup
Following recent publications concerning the influence of sweep and lean on transonic compressor blading (Denton et al, 1999, Hah et al, 1998 and Wadia et al, 1998), a new rotor was designed in cooperation with MTU Aero Engines (Munich, Germany)

Summary

Introduction

Following recent publications concerning the influence of sweep and lean on transonic compressor blading (Denton et al, 1999, Hah et al, 1998 and Wadia et al, 1998), a new rotor was designed in cooperation with MTU Aero Engines (Munich, Germany). Rotor designs with forward-swept blades are under consideration for the future, to further investigate the influence of sweep and lean on the transonic flow field. OPTICAL BLADE OSCILLATION MEASUREMENTS Before measurements of aerodynamic data were taken, the mechanical integrity of the rotor had to be tested.

Results

Conclusion