Abstract
The effect of the Reynolds number on the flying wing common research model with a large sweep angle and small aspect ratio is studied by numerical simulation. The helicity cross-flow transition correction of the Langtry–Menter model is established in view of the deficient prediction accuracies of existing transition prediction models in simulating cross-flow transition, and the helicity parameters are calibrated to improve the prediction accuracy of the numerical method. The transition prediction method is verified by the test results of the standard model transition of the DLR-F5 wing and small-aspect-ratio flying wing. At the same time, the numerical method is effectively verified by comparing it to the aerodynamic/torque results of the standard model of the small-aspect-ratio flying wing. On this basis, the variation laws with the Reynolds number are analyzed for the aerodynamic and flow field characteristics of the flying wing common research model with a large sweep angle and small aspect ratio. The numerical simulation is mainly carried out in the high subsonic speed range (M = 0.9), and the simulated Reynolds number range is from 2 × 106 to 80 × 106, which includes the test Reynolds number and flight Reynolds number. The influence of turbulence on the surface flow pattern and drag characteristics of the small-aspect-ratio standard model is analyzed. Calculation results show that when the turbulence is greater than 0.4%, it has a considerable influence on the surface laminar flow range and total drag coefficient. The results reveal that the Reynolds number mainly affects the magnitude of friction in the cruise state (small angle of attack). The problem of the Reynolds number in the self-aligning region of the flying wing standard model with a small aspect ratio is further studied, and the Reynolds number is found to be greater than 10 × 106. The drag and lift coefficients after the approach are close to the Reynolds number in the self-aligning region of the flying wing standard model with a small aspect ratio.
Reference28 articles.
1. Computational Study of the Low-Speed Flow over the 1303 UCAV Configuration;Arthur;Proceedings of the 25th AIAA Applied Aerodynamics Conference,2007
2. Strategy for Dynamic CFD Simulations on SACCON Configuration;Frink;Proceedings of the 28th AIAA Applied Aerodynamics Conference,2010
3. Research on Flow Characteristics of Low-Aspect-Ratio Flying-Wing at Transonic Speed;Su;Acta Aerodyn. Sin.,2015
4. Support Interference of Low-Aspect-Ratio Flying-Wing from Subsonic to Supersonic Speed;Su;Acta Aerodyn. Sin.,2015
5. Automatic Transition Prediction for Three-Dimensional Configurations with Focus on Industrial Application
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献