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三向碳/碳材料转捩压力的测量
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作者 张骞 陆兴煜 程淑芬 《宇航材料工艺》 CAS CSCD 北大核心 2003年第2期58-61,共4页
为评估三向碳/碳材料的烧蚀性能,在北京空气动力研究所研制的FD—04F电弧加热器上对三向碳/碳材料进行了滑行试验,测出了三向碳/碳材料的转捩压力。试验结果表明:滑行试验在测量转捩压力方面是有效的,并给出了三向碳/碳模型的转捩压力... 为评估三向碳/碳材料的烧蚀性能,在北京空气动力研究所研制的FD—04F电弧加热器上对三向碳/碳材料进行了滑行试验,测出了三向碳/碳材料的转捩压力。试验结果表明:滑行试验在测量转捩压力方面是有效的,并给出了三向碳/碳模型的转捩压力数据和最终外形形状。 展开更多
关键词 烧蚀性能 滑行试验 三向碳/碳材料 转捩压力 再入弹头 边界层 压力测量
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Numerical simulation of gurney flaps lift-enhancement on a low reynolds number airfoil 被引量:4
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作者 HE Xi WANG JinJun +3 位作者 YANG MuQing MA DongLi YAN Chao LIU PeiQing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第10期1548-1559,共12页
Two-dimensional steady Reynolds-averaged Navier-Stokes (RANS) equations with transition shear stress transport (SST) model were solved to investigate the effects of Gumey flaps on the aerodynamic performance of a ... Two-dimensional steady Reynolds-averaged Navier-Stokes (RANS) equations with transition shear stress transport (SST) model were solved to investigate the effects of Gumey flaps on the aerodynamic performance of a low Reynolds number airfoil. This airfoil was designed for flight vehicles operating at 20 km altitude with freestream velocity of 25 rn/s. The chord length (C) of this airfoil is 5 m and the corresponding Reynolds number is 7.76× 10^5. Gurney flaps with the heights ranging from 0.25%C to 3%C were investigated. It has been shown that Gurney flaps can enhance not only the prestall lift but also lift-to-drag ratio in a certain range of angles of attack. Specially, at cruise angle of attack (3°), Gurney flap with the height of 0.5%C can increase lift-to-drag ratio and lift coefficient by 1.6% and 12.8%, respectively. Furthermore, the mechanisms of Gumey flaps to improve the aerodynamic performance were illustrated by analyzing the surface pressure distribution, streamlines and trailing-edge flow structure for this low Reynolds number airfoil. Specially, distinguished from some other numerical researches, the flow details such as the laminar separation bubble and transition phenomena for low Reynolds number airfoil with Gumey flaps were investigated and it was found that Gurney flaps can delay the transition onset position at small angles of attack (≤2°). However, with the increase of angles of attack, Gurney flaps will promote the boundary layer transition. 展开更多
关键词 gurney flaps lift-enhancement low reynolds number numerical simulation
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