Transonic compressor Darmstadt - Open test case Introduction of the TUDa open test case

Abstract

Designs for future aero engines aim for increased efficiency with reduced exhaust gas and noise emissions. To achieve these goals, comprehensive physical understanding and highly innovative solutions are necessary. Even though computational capabilities are rising, the required confidence level is restrained. To understand and validate theoretical and numerical models, extensive experiments at realistic operating conditions are crucial. The modular compressor at the Transonic Compressor Darmstadt test facility at Technical University of Darmstadt enables investigations of prototype BLISK rotors in single or 1.5-stage setups, operating at high-speed conditions. Extensive steady and time-resolving instrumentation is used to determine the compressor aerodynamics and performance as well as aeroelastics. To foster improvements in numerical modelling and predictability based on high quality experimental data, the TUDa-GLR-OpenStage test case is introduced. It comprises a single stage setup, including the BLISK rotor, a 3D-optimized stator as well as the annulus contour. The data set is supplemented with comprehensive measurement data at stage inlet and outlet as well as running tip clearances. This paper describes the open test case, related geometries, measurement procedures and corresponding experimental results, including steady state performance and unsteady aerodynamics. Ultimately, it is aiming to provide a standard case for future development of numerical models and comparable validation.

Transonic compressor Darmstadt Open Test Case – unsteady aerodynamics and stall inception

“…Based on the test procedures, applied instrumentation and acquired time-resolved data, various analyses can be carried out in order to investigate unsteady aerodynamics at the rotor blade tip, both at steady-state and for transient operating conditions. For steady-state performance and detailed probe measurements, as well as additional information regarding the steady aerodynamics and instrumentation please refer to Klausmann et al (2022). An overview of the operating points with available WPT data is listed in Table 2.…”

“…The TUDa-GLR-OpenStage measurements are performed at a state-of-the-art test facility with extensive measurement systems and instrumentation, in conjunction with sophisticated test and analysis procedures. A comprehensive overview is provided in Klausmann et al (2022).…”

“…The introduced TUDa-GLR-OpenStage and corresponding data sets provide a comprehensive test case for the turbomachinery community. Klausmann et al (2022) provide an overview of the test case, experimental setups, measurement, and analysis methodologies as well as exemplary data and results.…”

Endwall geometric uncertainty and error on the performance of TUDA-GLR-OpenStage transonic axial compressor

“…The compressor stage, as shown in Figure 1, includes a blisk rotor with 16 radially stacked CDA-airfoils, an optimized 3D-shaped stator with 29 blades, and an outlet guide vane (OGV) that straightens the flow. The crucial design parameters of the investigated stage can be found in Klausmann et al (2022). The rotor was initially designed and tested by MTU in 1994 and has been investigated extensively in a series of research (Hoeger et al, 1999;Bergner et al, 2006;Muller et al, 2011).…”

“…Shaft input torque and rotor speed is measured using a torque meter. Further details of the experimental setup can be found in Klausmann et al (2022).…”