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摘要
Drag and heat flux reduction efficiency induced by the equal polygon opposing jet could be higher than the one issuing from conventional circular orifice. The two-equation SST kappa-omega turbulence model has been utilized to study the detailed information of flow field, and the numerical method has been validated against the available experimental data in the open literature. At last, the effects of angle of attack (alpha), angle of sideslip (beta) and angle of jet flow (delta) on the aerodynamic characteristics have been investigated numerically in the current study. The obtained results show that the drag force increases with a higher absolute value of a and the Stanton number (St) reaches its maximum when alpha=-10 degrees. Moreover, the peak St appears when alpha=5 degrees. The influence of beta on drag reduction shows similarity with that of alpha, and the maximum C-c appears when vertical bar beta vertical bar=10 degrees. More severe aero-heating occurs on the upper surface when vertical bar alpha vertical bar or vertical bar beta vertical bar changes from 0 degrees to 15 degrees. The delta can reduce the maximum heat flux (Q(max)) in the whole flow field and improve the thermal protection characteristics. The Q. can reduce 22.5% and 9.3% at most when delta is -5 degrees and 5 degrees respectively.
- 出版日期2017-4
- 单位中国人民解放军国防科学技术大学
