Abstract
RANS simulations of a generic ultra-high bypass ratio engine high-lift configuration were conducted in three different environments. The purpose of this study is to assess small scale tests in an atmospheric closed test section wind tunnel regarding transferability to large scale tests in an open-jet wind tunnel. Special emphasis was placed on the flow field in the separation prone region downstream from the extended slat cut-out. Validation with wind tunnel test data shows an adequate agreement with CFD results. The cross-comparison of the three sets of simulations allowed to identify the effects of the Reynolds number and the wind tunnel walls on the flow field separately. The simulations reveal significant blockage effects and corner flow separation induced by the test section walls. By comparison, the Reynolds number effects are negligible. A decrease of the incidence angle for the small scale model allows to successfully reproduce the flow field of the large scale model despite severe wind tunnel wall effects.
Highlights
The annual increase of around 4.8% in air passenger transport and the related impact on greenhouse gas emission and local air quality poses substantial challenges for the aircraft industry
The grid for the large scale model (LSM) at modified Reynolds number (MR-LSM) corresponding to the small scale model (SSM) tests was derived by scaling the LSM mesh down to SSM scale
The results reveal that the flow fields around the LSM and the SSM show highly satisfactory agreement when considered at the same cL
Summary
The annual increase of around 4.8% in air passenger transport and the related impact on greenhouse gas emission and local air quality poses substantial challenges for the aircraft industry. Aviation already accounts for 2% of global greenhouse gas emission. The promising Suction and Oscillatory Blowing (SaOB) [6] actuator regarding its efficiency on a complex UHBR engine high-lift configuration at realistic inflow conditions. This demonstration on a near full-scale configuration will allow to increase the maturity level of technology toward TRL3, which means “verification of technology in a realistic environment”. Tel-Aviv University (Faculty of Engineering) was in charge of the recently conducted small scale tests Since both wind tunnels are operated at atmospheric conditions the difference in the model scale is directly reflected in the Reynolds numbers. The two wind tunnels differ regarding their test section enclosure—open (LSM) versus closed (SSM) test section environment
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
