7 research outputs found
Complementary Numerical and Experimental Data Analysis of the ETW Telfona Pathfinder Wing Transition Tests
Within the European Project Telfona the Pathfinder Model was designed, analyzed
numerically, constructed and tested with the aim of obtaining a laminar flow testing
capability in the European Transonic Wind Tunnel (ETW). The model was designed for
natural laminar flow (NLF) for transonic flow conditions with high Reynolds number.
Results of pre-test numerical analysis demonstrated that the Pathfinder wing pressure
distribution was adequate for providing calibration test points. The ETW tests provided
pressure distribution data while transition positions were determined from images using the
Cryogenic Temperature Sensitive Paint Method (cryoTSP). The evaluation of this data with
several transition prediction tools was used to establish the transition N-factor values for
ETW. In this work, after-test CFD solutions are obtained using numerical Navier-Stokes
solutions. In the first part of this work, numerical results are given which verify the
requirements of the Pathfinder wing as a calibration model. In the second part, it is shown
that for selected flow conditions a good agreement is obtained between stability analysis
based on experimental and numerical data. In the third part the correlation of experimental
transition locations to critical N-factors is summarized for ETW Test Phases I and II. In the
fourth part numerical analysis and experimental data are used complementarily