Influence of suction flow control on aerodynamic characteristics of blended-wing-body aircraft
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摘要:
以采用分布式动力的翼身融合飞机为研究对象,探究了吸气流动控制方式(吸气位置和吸气动量)对飞机起飞和巡航状态下气动特性的影响规律,解释了吸气流动控制影响翼身融合飞机气动特性的机理。研究结果表明:起飞大攻角状态下,采用外翼段吸气方案(吸气位置为0.05
c ,吸气动量为0.02),飞机最大升力系数与无吸气状态相比提升7.16%;巡航状态下,采用中心体段吸气方案(吸气位置为0.6c ,吸气动量为0.012 5),可改善动力系统的压力分布,飞机升阻比与无吸气状态相比最大提升2.14%。Abstract:This paper studies a blended-wing-body aircraft with distributed propulsion, explores the influence of suction control (with suction position and suction momentum variables) on the aerodynamic characteristics of aircraft in take-off and cruise state and explains the mechanism of the influence of suction flow control on the aerodynamic characteristics of the blended-wing-body aircraft. The results show that under the condition of high take-off attack angle, compared with the non-aspirated state, the maximum lift coefficient of the aircraft is increased by 7.16% when the aspirator is located in the outer wing segment (chord position being 0.05
c , and inspiratory momentum being 0.02). In the cruise state, when the aspirator is located in the centrosome (chord position being 0.6c , and inspiratory momentum being 0.012 5), the pressure distribution of the powertrain is improved, and the lift-drag ratio of the aircraft is increased by 2.14% compared with that of the non-getter state.-
Key words:
- blended-wing-body /
- flow control /
- suction position /
- suction volume /
- aerodynamic performance
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表 1 BWB-350总体参数
Table 1. Overall parameters of BWB-350
参数 数值 最大航程/km 14 800 巡航高度/m 11 000 巡航马赫数 0.85 起飞离地速度/(m·s-1) 84 进场速度/(m·s-1) 72 最大起飞重量/kg 232 000 表 2 BWB-350几何参数
Table 2. Geometric parameters of BWB-350
参数 数值 翼展/m 68 参考面积/m2 560 外翼前缘后掠角/(°) 36 展弦比 8.14 平均气动弦长/m 10.6 重心距前缘距离/m 27.3 表 3 不同ymax+网格的计算结果对比(Ma=0.21, α=10°)
Table 3. Comparison of calculation results of different ymax+ grids (Ma=0.21, α=10°)
网格密度/104 第1层网格高度 ymax+ CL Cd 150 1×10-3 140 0.984 2 0.116 43 150 1×10-4 16 0.989 3 0.117 39 150 2×10-5 2 0.989 9 0.117 89 150 1×10-5 0.8 0.989 7 0.117 92 表 4 不同网格密度计算结果对比(Ma=0.21, α=10°)
Table 4. Comparison of calculation results of different overall grid densities (Ma=0.21, α=10°)
网格密度/104 第1层网格高度 ymax+ CL Cd 70 2×10-5 2 0.985 3 0.116 41 100 2×10-5 2 0.986 2 0.116 93 150 2×10-5 2 0.989 9 0.117 89 230 2×10-5 2 0.989 8 0.117 84 表 5 不同ymax+网格的计算结果对比(Ma=0.85, α=2.6°)
Table 5. Comparison of calculation results of different ymax+ grids (Ma=0.85, α=2.6°)
网格密度/104 第1层网格高度 ymax+ CL Cd 150 1×10-3 140 0.353 7 0.016 50 150 1×10-4 16 0.354 0 0.015 25 150 2×10-5 2 0.354 1 0.015 50 150 1×10-5 0.8 0.354 1 0.015 50 表 6 不同网格密度计算结果对比(Ma=0.85, α=2.6°)
Table 6. Comparison of calculation results of different overall grid densities (Ma=0.85, α=2.6°)
网格密度/104 第1层网格高度 ymax+ CL Cd 70 2×10-5 2 0.354 5 0.016 50 100 2×10-5 2 0.353 9 0.015 75 150 2×10-5 2 0.354 1 0.015 50 230 2×10-5 2 0.354 1 0.015 49 表 7 飞行条件
Table 7. Flight conditions
状态 高度/m 马赫数 MFR 静压/Pa 静温/K 密度/(kg·m-3) 起飞 0 0.21 1.60 101 325 288.2 1.224 9 巡航 11 000 0.85 0.68 22 700 216.7 0.363 9 注:MFR为质量流率。 -
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